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  1. Article ; Online: Search for Sterile Neutrinos in MINOS and MINOS+ Using a Two-Detector Fit.

    Adamson, P / Anghel, I / Aurisano, A / Barr, G / Bishai, M / Blake, A / Bock, G J / Bogert, D / Cao, S V / Carroll, T J / Castromonte, C M / Chen, R / Childress, S / Coelho, J A B / Corwin, L / Cronin-Hennessy, D / de Jong, J K / De Rijck, S / Devan, A V /
    Devenish, N E / Diwan, M V / Escobar, C O / Evans, J J / Falk, E / Feldman, G J / Flanagan, W / Frohne, M V / Gabrielyan, M / Gallagher, H R / Germani, S / Gomes, R A / Goodman, M C / Gouffon, P / Graf, N / Gran, R / Grzelak, K / Habig, A / Hahn, S R / Hartnell, J / Hatcher, R / Holin, A / Huang, J / Hylen, J / Irwin, G M / Isvan, Z / James, C / Jensen, D / Kafka, T / Kasahara, S M S / Koerner, L W / Koizumi, G / Kordosky, M / Kreymer, A / Lang, K / Ling, J / Litchfield, P J / Lucas, P / Mann, W A / Marshak, M L / Mayer, N / McGivern, C / Medeiros, M M / Mehdiyev, R / Meier, J R / Messier, M D / Miller, W H / Mishra, S R / Moed Sher, S / Moore, C D / Mualem, L / Musser, J / Naples, D / Nelson, J K / Newman, H B / Nichol, R J / Nowak, J A / O'Connor, J / Orchanian, M / Pahlka, R B / Paley, J / Patterson, R B / Pawloski, G / Perch, A / Pfützner, M M / Phan, D D / Phan-Budd, S / Plunkett, R K / Poonthottathil, N / Qiu, X / Radovic, A / Rebel, B / Rosenfeld, C / Rubin, H A / Sail, P / Sanchez, M C / Schneps, J / Schreckenberger, A / Schreiner, P / Sharma, R / Sousa, A / Tagg, N / Talaga, R L / Thomas, J / Thomson, M A / Tian, X / Timmons, A / Todd, J / Tognini, S C / Toner, R / Torretta, D / Tzanakos, G / Urheim, J / Vahle, P / Viren, B / Weber, A / Webb, R C / White, C / Whitehead, L H / Wojcicki, S G / Zwaska, R

    Physical review letters

    2019  Volume 122, Issue 9, Page(s) 91803

    Abstract: A search for mixing between active neutrinos and light sterile neutrinos has been performed by looking for muon neutrino disappearance in two detectors at baselines of 1.04 and 735 km, using a combined MINOS and MINOS+ exposure of 16.36×10^{20} protons ... ...

    Abstract A search for mixing between active neutrinos and light sterile neutrinos has been performed by looking for muon neutrino disappearance in two detectors at baselines of 1.04 and 735 km, using a combined MINOS and MINOS+ exposure of 16.36×10^{20} protons on target. A simultaneous fit to the charged-current muon neutrino and neutral-current neutrino energy spectra in the two detectors yields no evidence for sterile neutrino mixing using a 3+1 model. The most stringent limit to date is set on the mixing parameter sin^{2}θ_{24} for most values of the sterile neutrino mass splitting Δm_{41}^{2}>10^{-4}  eV^{2}.
    Language English
    Publishing date 2019-04-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.122.091803
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Limits to Gauge Coupling in the Dark Sector Set by the Nonobservation of Instanton-Induced Decay of Super-Heavy Dark Matter in the Pierre Auger Observatory Data.

    Abreu, P / Aglietta, M / Albury, J M / Allekotte, I / Almeida Cheminant, K / Almela, A / Aloisio, R / Alvarez-Muñiz, J / Alves Batista, R / Ammerman Yebra, J / Anastasi, G A / Anchordoqui, L / Andrada, B / Andringa, S / Aramo, C / Araújo Ferreira, P R / Arnone, E / Arteaga Velázquez, J C / Asorey, H /
    Assis, P / Avila, G / Avocone, E / Badescu, A M / Bakalova, A / Balaceanu, A / Barbato, F / Bellido, J A / Berat, C / Bertaina, M E / Bhatta, G / Biermann, P L / Binet, V / Bismark, K / Bister, T / Biteau, J / Blazek, J / Bleve, C / Blümer, J / Boháčová, M / Boncioli, D / Bonifazi, C / Bonneau Arbeletche, L / Borodai, N / Botti, A M / Brack, J / Bretz, T / Brichetto Orchera, P G / Briechle, F L / Buchholz, P / Bueno, A / Buitink, S / Buscemi, M / Büsken, M / Caballero-Mora, K S / Caccianiga, L / Canfora, F / Caracas, I / Caruso, R / Castellina, A / Catalani, F / Cataldi, G / Cazon, L / Cerda, M / Chinellato, J A / Chudoba, J / Chytka, L / Clay, R W / Cobos Cerutti, A C / Colalillo, R / Coleman, A / Coluccia, M R / Conceição, R / Condorelli, A / Consolati, G / Contreras, F / Convenga, F / Correia Dos Santos, D / Covault, C E / Dasso, S / Daumiller, K / Dawson, B R / Day, J A / de Almeida, R M / de Jesús, J / de Jong, S J / de Mello Neto, J R T / De Mitri, I / de Oliveira, J / de Oliveira Franco, D / de Palma, F / de Souza, V / De Vito, E / Del Popolo, A / Del Río, M / Deligny, O / Deval, L / di Matteo, A / Dobre, M / Dobrigkeit, C / D'Olivo, J C / Domingues Mendes, L M / Dos Anjos, R C / Dova, M T / Ebr, J / Engel, R / Epicoco, I / Erdmann, M / Escobar, C O / Etchegoyen, A / Falcke, H / Farmer, J / Farrar, G / Fauth, A C / Fazzini, N / Feldbusch, F / Fenu, F / Fick, B / Figueira, J M / Filipčič, A / Fitoussi, T / Fodran, T / Fujii, T / Fuster, A / Galea, C / Galelli, C / García, B / Garcia Vegas, A L / Gemmeke, H / Gesualdi, F / Gherghel-Lascu, A / Ghia, P L / Giaccari, U / Giammarchi, M / Glombitza, J / Gobbi, F / Gollan, F / Golup, G / Gómez Berisso, M / Gómez Vitale, P F / Gongora, J P / González, J M / González, N / Goos, I / Góra, D / Gorgi, A / Gottowik, M / Grubb, T D / Guarino, F / Guedes, G P / Guido, E / Hahn, S / Hamal, P / Hampel, M R / Hansen, P / Harari, D / Harvey, V M / Haungs, A / Hebbeker, T / Heck, D / Hill, G C / Hojvat, C / Hörandel, J R / Horvath, P / Hrabovský, M / Huege, T / Insolia, A / Isar, P G / Janecek, P / Johnsen, J A / Jurysek, J / Kääpä, A / Kampert, K H / Keilhauer, B / Khakurdikar, A / Kizakke Covilakam, V V / Klages, H O / Kleifges, M / Kleinfeller, J / Knapp, F / Kunka, N / Lago, B L / Langner, N / Leigui de Oliveira, M A / Lenok, V / Letessier-Selvon, A / Lhenry-Yvon, I / Lo Presti, D / Lopes, L / López, R / Lu, L / Luce, Q / Lundquist, J P / Machado Payeras, A / Mancarella, G / Mandat, D / Manning, B C / Manshanden, J / Mantsch, P / Marafico, S / Mariani, F M / Mariazzi, A G / Mariş, I C / Marsella, G / Martello, D / Martinelli, S / Martínez Bravo, O / Mastrodicasa, M / Mathes, H J / Matthews, J / Matthiae, G / Mayotte, E / Mayotte, S / Mazur, P O / Medina-Tanco, G / Melo, D / Menshikov, A / Michal, S / Micheletti, M I / Miramonti, L / Mollerach, S / Montanet, F / Morejon, L / Morello, C / Mostafá, M / Müller, A L / Muller, M A / Mulrey, K / Mussa, R / Muzio, M / Namasaka, W M / Nasr-Esfahani, A / Nellen, L / Nicora, G / Niculescu-Oglinzanu, M / Niechciol, M / Nitz, D / Norwood, I / Nosek, D / Novotny, V / Nožka, L / Nucita, A / Núñez, L A / Oliveira, C / Palatka, M / Pallotta, J / Papenbreer, P / Parente, G / Parra, A / Pawlowsky, J / Pech, M / Pękala, J / Pelayo, R / Peña-Rodriguez, J / Pereira Martins, E E / Perez Armand, J / Pérez Bertolli, C / Perrone, L / Petrera, S / Petrucci, C / Pierog, T / Pimenta, M / Pirronello, V / Platino, M / Pont, B / Pothast, M / Privitera, P / Prouza, M / Puyleart, A / Querchfeld, S / Rautenberg, J / Ravignani, D / Reininghaus, M / Ridky, J / Riehn, F / Risse, M / Rizi, V / Rodrigues de Carvalho, W / Rodriguez Rojo, J / Roncoroni, M J / Rossoni, S / Roth, M / Roulet, E / Rovero, A C / Ruehl, P / Saftoiu, A / Saharan, M / Salamida, F / Salazar, H / Salina, G / Sanabria Gomez, J D / Sánchez, F / Santos, E M / Santos, E / Sarazin, F / Sarmento, R / Sarmiento-Cano, C / Sato, R / Savina, P / Schäfer, C M / Scherini, V / Schieler, H / Schimassek, M / Schimp, M / Schlüter, F / Schmidt, D / Scholten, O / Schoorlemmer, H / Schovánek, P / Schröder, F G / Schulte, J / Schulz, T / Sciutto, S J / Scornavacche, M / Segreto, A / Sehgal, S / Shellard, R C / Sigl, G / Silli, G / Sima, O / Smau, R / Šmída, R / Sommers, P / Soriano, J F / Squartini, R / Stadelmaier, M / Stanca, D / Stanič, S / Stasielak, J / Stassi, P / Streich, A / Suárez-Durán, M / Sudholz, T / Suomijärvi, T / Supanitsky, A D / Szadkowski, Z / Tapia, A / Taricco, C / Timmermans, C / Tkachenko, O / Tobiska, P / Todero Peixoto, C J / Tomé, B / Torrès, Z / Travaini, A / Travnicek, P / Trimarelli, C / Tueros, M / Ulrich, R / Unger, M / Vaclavek, L / Vacula, M / Valdés Galicia, J F / Valore, L / Varela, E / Vásquez-Ramírez, A / Veberič, D / Ventura, C / Vergara Quispe, I D / Verzi, V / Vicha, J / Vink, J / Vorobiov, S / Wahlberg, H / Watanabe, C / Watson, A A / Weindl, A / Wiencke, L / Wilczyński, H / Wittkowski, D / Wundheiler, B / Yushkov, A / Zapparrata, O / Zas, E / Zavrtanik, D / Zavrtanik, M / Zehrer, L

    Physical review letters

    2023  Volume 130, Issue 6, Page(s) 61001

    Abstract: Instantons, which are nonperturbative solutions to Yang-Mills equations, provide a signal for the occurrence of quantum tunneling between distinct classes of vacua. They can give rise to decays of particles otherwise forbidden. Using data collected at ... ...

    Abstract Instantons, which are nonperturbative solutions to Yang-Mills equations, provide a signal for the occurrence of quantum tunneling between distinct classes of vacua. They can give rise to decays of particles otherwise forbidden. Using data collected at the Pierre Auger Observatory, we search for signatures of such instanton-induced processes that would be suggestive of super-heavy particles decaying in the Galactic halo. These particles could have been produced during the post-inflationary epoch and match the relic abundance of dark matter inferred today. The nonobservation of the signatures searched for allows us to derive a bound on the reduced coupling constant of gauge interactions in the dark sector: α_{X}≲0.09, for 10^{9}≲M_{X}/GeV<10^{19}. Conversely, we obtain that, for instance, a reduced coupling constant α_{X}=0.09 excludes masses M_{X}≳3×10^{13}  GeV. In the context of dark matter production from gravitational interactions alone, we illustrate how these bounds are complementary to those obtained on the Hubble rate at the end of inflation from the nonobservation of tensor modes in the cosmological microwave background.
    Language English
    Publishing date 2023-02-20
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.130.061001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Search for the rare decays K(L)→π0π0μ+μ- and K(L)→π0π0X0→π0π0μ+μ-.

    Abouzaid, E / Arenton, M / Barker, A R / Bellantoni, L / Blucher, E / Bock, G J / Cheu, E / Coleman, R / Corcoran, M D / Cox, B / Erwin, A R / Escobar, C O / Glazov, A / Golossanov, A / Gomes, R A / Gouffon, P / Hsiung, Y B / Jensen, D A / Kessler, R /
    Kotera, K / Ledovskoy, A / McBride, P L / Monnier, E / Nguyen, H / Niclasen, R / Phillips, D G / Ping, H / Ramberg, E J / Ray, R E / Ronquest, M / Santos, E / Slater, W / Smith, D / Solomey, N / Swallow, E C / Toale, P A / Tschirhart, R / Velissaris, C / Wah, Y W / Wang, J / White, H B / Whitmore, J / Wilking, M J / Winston, R / Worcester, E T / Worcester, M / Yamanaka, T / Zimmerman, E D / Zukanovich, R F

    Physical review letters

    2011  Volume 107, Issue 20, Page(s) 201803

    Abstract: The KTeV E799 experiment has conducted a search for the rare decays, K(L)→π(0)π(0)μ(+)μ(-) and K(L)→π(0)π(0)X(0)→π(0)π(0)μ(+)μ(-), where the X(0) is a possible new neutral boson that was reported by the HyperCP experiment with a mass of (214.3 ± 0.5) MeV/ ...

    Abstract The KTeV E799 experiment has conducted a search for the rare decays, K(L)→π(0)π(0)μ(+)μ(-) and K(L)→π(0)π(0)X(0)→π(0)π(0)μ(+)μ(-), where the X(0) is a possible new neutral boson that was reported by the HyperCP experiment with a mass of (214.3 ± 0.5) MeV/c(2). We find no evidence for either decay. We obtain upper limits of Br(K(L)→π(0)π(0)X(0)→π(0)π(0)μ(+)μ(-)) < 1.0 × 10(-10) and Br(K(L)→π(0)π(0)μ(+)μ(-)) < 9.2 × 10(-11) at the 90% confidence level. This result rules out the pseudoscalar X(0) as an explanation of the HyperCP result under the scenario that the dsX(0) coupling is completely real.
    Language English
    Publishing date 2011-11-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.107.201803
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Search for Sterile Neutrinos Mixing with Muon Neutrinos in MINOS.

    Adamson, P / Anghel, I / Aurisano, A / Barr, G / Bishai, M / Blake, A / Bock, G J / Bogert, D / Cao, S V / Carroll, T J / Castromonte, C M / Chen, R / Childress, S / Coelho, J A B / Corwin, L / Cronin-Hennessy, D / de Jong, J K / De Rijck, S / Devan, A V /
    Devenish, N E / Diwan, M V / Escobar, C O / Evans, J J / Falk, E / Feldman, G J / Flanagan, W / Frohne, M V / Gabrielyan, M / Gallagher, H R / Germani, S / Gomes, R A / Goodman, M C / Gouffon, P / Graf, N / Gran, R / Grzelak, K / Habig, A / Hahn, S R / Hartnell, J / Hatcher, R / Holin, A / Huang, J / Hylen, J / Irwin, G M / Isvan, Z / James, C / Jensen, D / Kafka, T / Kasahara, S M S / Koizumi, G / Kordosky, M / Kreymer, A / Lang, K / Ling, J / Litchfield, P J / Lucas, P / Mann, W A / Marshak, M L / Mayer, N / McGivern, C / Medeiros, M M / Mehdiyev, R / Meier, J R / Messier, M D / Miller, W H / Mishra, S R / Moed Sher, S / Moore, C D / Mualem, L / Musser, J / Naples, D / Nelson, J K / Newman, H B / Nichol, R J / Nowak, J A / O'Connor, J / Orchanian, M / Pahlka, R B / Paley, J / Patterson, R B / Pawloski, G / Perch, A / Pfützner, M M / Phan, D D / Phan-Budd, S / Plunkett, R K / Poonthottathil, N / Qiu, X / Radovic, A / Rebel, B / Rosenfeld, C / Rubin, H A / Sail, P / Sanchez, M C / Schneps, J / Schreckenberger, A / Schreiner, P / Sharma, R / Sousa, A / Tagg, N / Talaga, R L / Thomas, J / Thomson, M A / Tian, X / Timmons, A / Todd, J / Tognini, S C / Toner, R / Torretta, D / Tzanakos, G / Urheim, J / Vahle, P / Viren, B / Weber, A / Webb, R C / White, C / Whitehead, L / Whitehead, L H / Wojcicki, S G / Zwaska, R

    Physical review letters

    2016  Volume 117, Issue 15, Page(s) 151803

    Abstract: We report results of a search for oscillations involving a light sterile neutrino over distances of 1.04 and 735 km in a ν_{μ}-dominated beam with a peak energy of 3 GeV. The data, from an exposure of 10.56×10^{20} protons on target, are analyzed using a ...

    Abstract We report results of a search for oscillations involving a light sterile neutrino over distances of 1.04 and 735 km in a ν_{μ}-dominated beam with a peak energy of 3 GeV. The data, from an exposure of 10.56×10^{20} protons on target, are analyzed using a phenomenological model with one sterile neutrino. We constrain the mixing parameters θ_{24} and Δm_{41}^{2} and set limits on parameters of the four-dimensional Pontecorvo-Maki-Nakagawa-Sakata matrix, |U_{μ4}|^{2} and |U_{τ4}|^{2}, under the assumption that mixing between ν_{e} and ν_{s} is negligible (|U_{e4}|^{2}=0). No evidence for ν_{μ}→ν_{s} transitions is found and we set a world-leading limit on θ_{24} for values of Δm_{41}^{2}≲1  eV^{2}.
    Language English
    Publishing date 2016-10-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.117.151803
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Determination of the parity of the neutral pion via its four-electron decay.

    Abouzaid, E / Arenton, M / Barker, A R / Bellantoni, L / Blucher, E / Bock, G J / Cheu, E / Coleman, R / Corcoran, M D / Cox, B / Erwin, A R / Escobar, C O / Glazov, A / Golossanov, A / Gomes, R A / Gouffon, P / Hsiung, Y B / Jensen, D A / Kessler, R /
    Kotera, K / Ledovskoy, A / McBride, P L / Monnier, E / Nguyen, H / Niclasen, R / Phillips, D G / Ramberg, E J / Ray, R E / Ronquest, M / Santos, E / Slater, W / Smith, D / Solomey, N / Swallow, E C / Toale, P A / Tschirhart, R / Wah, Y W / Wang, J / White, H B / Whitmore, J / Wilking, M J / Winstein, B / Winston, R / Worcester, E T / Yamanaka, T / Zimmerman, E D / Zukanovich, R F

    Physical review letters

    2008  Volume 100, Issue 18, Page(s) 182001

    Abstract: We present a new determination of the parity of the neutral pion via the double Dalitz decay pi0-->e+e-e+e-. Our sample, which consists of 30,511 candidate decays, was collected from KL-->pi0pi0pi0 decays in flight at the KTeV-E799 experiment at Fermi ... ...

    Abstract We present a new determination of the parity of the neutral pion via the double Dalitz decay pi0-->e+e-e+e-. Our sample, which consists of 30,511 candidate decays, was collected from KL-->pi0pi0pi0 decays in flight at the KTeV-E799 experiment at Fermi National Accelerator Laboratory. We confirm the negative pi0 parity and place a limit on scalar contributions to the pi0-->e+e-e+e- decay amplitude of less than 3.3% assuming CPT conservation. The pi0gamma*gamma* form factor is well described by a momentum-dependent model with a slope parameter fit to the final state phase-space distribution. Additionally, we have measured the branching ratio of this mode to be B(pi0-->e+e-e+e-)=(3.26+/-0.18)x10(-5).
    Language English
    Publishing date 2008-05-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.100.182001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Search for lepton-flavor-violating decays of the neutral kaon.

    Abouzaid, E / Arenton, M / Barker, A R / Bellantoni, L / Bellavance, A / Blucher, E / Bock, G J / Cheu, E / Coleman, R / Corcoran, M D / Cox, B / Erwin, A R / Escobar, C O / Glazov, A / Golossanov, A / Gomes, R A / Gouffon, P / Hsiung, Y B / Jensen, D A /
    Kessler, R / Kotera, K / Ledovskoy, A / McBride, P L / Monnier, E / Nguyen, H / Niclasen, R / Ii, D G Phillips / Ping, H / Ramberg, E J / Ray, R E / Ronquest, M / Santos, E / Slater, W / Smith, D / Solomey, N / Swallow, E C / Toale, P A / Tschirhart, R / Wah, Y W / Wang, J / White, H B / Whitmore, J / Wilking, M J / Winstein, B / Winston, R / Wolfe, C / Worcester, E T / Worcester, M / Yamanaka, T / Zimmerman, E D / Zukanovich, R F

    Physical review letters

    2008  Volume 100, Issue 13, Page(s) 131803

    Abstract: The Fermilab KTeV experiment has searched for lepton-flavor-violating decays of the K(L) meson in three decay modes. We observe no events in the signal region for any of the modes studied, and we set the following upper limits for their branching ratios ... ...

    Abstract The Fermilab KTeV experiment has searched for lepton-flavor-violating decays of the K(L) meson in three decay modes. We observe no events in the signal region for any of the modes studied, and we set the following upper limits for their branching ratios at the 90% C.L.: BR(K(L) --> pi(0) micro(+/-) e(-/+)) <7.6 x 10(-11); BR(K(L) --> pi(0)pi(0) micro(+/-) e(-/+)) <1.7 x 10(-10); BR(pi(0) --> micro(+/-) e(-/+)) <3.6 x 10(-10). This result represents a factor of 82 improvement in the branching ratio limit for K(L) --> pi(0) micro(+/-) e(-/+) and is the first reported limit for K(L) --> pi(0)pi(0) micro(+/-) e(-/+).
    Language English
    Publishing date 2008-04-04
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.100.131803
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Measurement of the Fluctuations in the Number of Muons in Extensive Air Showers with the Pierre Auger Observatory.

    Aab, A / Abreu, P / Aglietta, M / Albury, J M / Allekotte, I / Almela, A / Alvarez-Muñiz, J / Alves Batista, R / Anastasi, G A / Anchordoqui, L / Andrada, B / Andringa, S / Aramo, C / Araújo Ferreira, P R / Asorey, H / Assis, P / Avila, G / Badescu, A M / Bakalova, A /
    Balaceanu, A / Barbato, F / Barreira Luz, R J / Becker, K H / Bellido, J A / Berat, C / Bertaina, M E / Bertou, X / Biermann, P L / Bister, T / Biteau, J / Blazek, J / Bleve, C / Boháčová, M / Boncioli, D / Bonifazi, C / Bonneau Arbeletche, L / Borodai, N / Botti, A M / Brack, J / Bretz, T / Briechle, F L / Buchholz, P / Bueno, A / Buitink, S / Buscemi, M / Caballero-Mora, K S / Caccianiga, L / Cancio, A / Canfora, F / Caracas, I / Carceller, J M / Caruso, R / Castellina, A / Catalani, F / Cataldi, G / Cazon, L / Cerda, M / Chinellato, J A / Choi, K / Chudoba, J / Chytka, L / Clay, R W / Cobos Cerutti, A C / Colalillo, R / Coleman, A / Coluccia, M R / Conceição, R / Condorelli, A / Consolati, G / Contreras, F / Convenga, F / Covault, C E / Dasso, S / Daumiller, K / Dawson, B R / Day, J A / de Almeida, R M / de Jesús, J / de Jong, S J / De Mauro, G / de Mello Neto, J R T / De Mitri, I / de Oliveira, J / de Oliveira Franco, D / de Souza, V / De Vito, E / Debatin, J / Del Río, M / Deligny, O / Dembinski, H / Dhital, N / Di Matteo, A / Dobrigkeit, C / D'Olivo, J C / Dos Anjos, R C / Dova, M T / Ebr, J / Engel, R / Epicoco, I / Erdmann, M / Escobar, C O / Etchegoyen, A / Falcke, H / Farmer, J / Farrar, G / Fauth, A C / Fazzini, N / Feldbusch, F / Fenu, F / Fick, B / Figueira, J M / Filipčič, A / Fodran, T / Freire, M M / Fujii, T / Fuster, A / Galea, C / Galelli, C / García, B / Garcia Vegas, A L / Gemmeke, H / Gesualdi, F / Gherghel-Lascu, A / Ghia, P L / Giaccari, U / Giammarchi, M / Giller, M / Glombitza, J / Gobbi, F / Gollan, F / Golup, G / Gómez Berisso, M / Gómez Vitale, P F / Gongora, J P / González, N / Goos, I / Góra, D / Gorgi, A / Gottowik, M / Grubb, T D / Guarino, F / Guedes, G P / Guido, E / Hahn, S / Halliday, R / Hampel, M R / Hansen, P / Harari, D / Harvey, V M / Haungs, A / Hebbeker, T / Heck, D / Hill, G C / Hojvat, C / Hörandel, J R / Horvath, P / Hrabovský, M / Huege, T / Hulsman, J / Insolia, A / Isar, P G / Johnsen, J A / Jurysek, J / Kääpä, A / Kampert, K H / Keilhauer, B / Kemp, J / Klages, H O / Kleifges, M / Kleinfeller, J / Köpke, M / Kukec Mezek, G / Lago, B L / LaHurd, D / Lang, R G / Langner, N / Leigui de Oliveira, M A / Lenok, V / Letessier-Selvon, A / Lhenry-Yvon, I / Lo Presti, D / Lopes, L / López, R / Lorek, R / Luce, Q / Lucero, A / Lundquist, J P / Machado Payeras, A / Mancarella, G / Mandat, D / Manning, B C / Manshanden, J / Mantsch, P / Marafico, S / Mariazzi, A G / Mariş, I C / Marsella, G / Martello, D / Martinez, H / Martínez Bravo, O / Mastrodicasa, M / Mathes, H J / Matthews, J / Matthiae, G / Mayotte, E / Mazur, P O / Medina-Tanco, G / Melo, D / Menshikov, A / Merenda, K-D / Michal, S / Micheletti, M I / Miramonti, L / Mollerach, S / Montanet, F / Morello, C / Mostafá, M / Müller, A L / Muller, M A / Mulrey, K / Mussa, R / Muzio, M / Namasaka, W M / Nellen, L / Niculescu-Oglinzanu, M / Niechciol, M / Nitz, D / Nosek, D / Novotny, V / Nožka, L / Nucita, A / Núñez, L A / Palatka, M / Pallotta, J / Papenbreer, P / Parente, G / Parra, A / Pech, M / Pedreira, F / Pȩkala, J / Pelayo, R / Peña-Rodriguez, J / Perez Armand, J / Perlin, M / Perrone, L / Petrera, S / Pierog, T / Pimenta, M / Pirronello, V / Platino, M / Pont, B / Pothast, M / Privitera, P / Prouza, M / Puyleart, A / Querchfeld, S / Rautenberg, J / Ravignani, D / Reininghaus, M / Ridky, J / Riehn, F / Risse, M / Ristori, P / Rizi, V / Rodrigues de Carvalho, W / Rodriguez Rojo, J / Roncoroni, M J / Roth, M / Roulet, E / Rovero, A C / Ruehl, P / Saffi, S J / Saftoiu, A / Salamida, F / Salazar, H / Salina, G / Sanabria Gomez, J D / Sánchez, F / Santos, E M / Santos, E / Sarazin, F / Sarmento, R / Sarmiento-Cano, C / Sato, R / Savina, P / Schäfer, C M / Scherini, V / Schieler, H / Schimassek, M / Schimp, M / Schlüter, F / Schmidt, D / Scholten, O / Schovánek, P / Schröder, F G / Schröder, S / Schulte, J / Sciutto, S J / Scornavacche, M / Shellard, R C / Sigl, G / Silli, G / Sima, O / Šmída, R / Sommers, P / Soriano, J F / Souchard, J / Squartini, R / Stadelmaier, M / Stanca, D / Stanič, S / Stasielak, J / Stassi, P / Streich, A / Suárez-Durán, M / Sudholz, T / Suomijärvi, T / Supanitsky, A D / Šupík, J / Szadkowski, Z / Taboada, A / Tapia, A / Timmermans, C / Tkachenko, O / Tobiska, P / Todero Peixoto, C J / Tomé, B / Torralba Elipe, G / Travaini, A / Travnicek, P / Trimarelli, C / Trini, M / Tueros, M / Ulrich, R / Unger, M / Vaclavek, L / Vacula, M / Valdés Galicia, J F / Valiño, I / Valore, L / Varela, E / Varma K C, V / Vásquez-Ramírez, A / Veberič, D / Ventura, C / Vergara Quispe, I D / Verzi, V / Vicha, J / Vink, J / Vorobiov, S / Wahlberg, H / Watson, A A / Weber, M / Weindl, A / Wiencke, L / Wilczyński, H / Winchen, T / Wirtz, M / Wittkowski, D / Wundheiler, B / Yushkov, A / Zapparrata, O / Zas, E / Zavrtanik, D / Zavrtanik, M / Zehrer, L / Zepeda, A

    Physical review letters

    2021  Volume 126, Issue 15, Page(s) 152002

    Abstract: We present the first measurement of the fluctuations in the number of muons in extensive air showers produced by ultrahigh energy cosmic rays. We find that the measured fluctuations are in good agreement with predictions from air shower simulations. This ...

    Abstract We present the first measurement of the fluctuations in the number of muons in extensive air showers produced by ultrahigh energy cosmic rays. We find that the measured fluctuations are in good agreement with predictions from air shower simulations. This observation provides new insights into the origin of the previously reported deficit of muons in air shower simulations and constrains models of hadronic interactions at ultrahigh energies. Our measurement is compatible with the muon deficit originating from small deviations in the predictions from hadronic interaction models of particle production that accumulate as the showers develop.
    Language English
    Publishing date 2021-04-30
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.126.152002
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  8. Article: First observation of K{L}-->pi{+/-}e{-/+}nue{+}e{-}.

    Abouzaid, E / Arenton, M / Barker, A R / Bellantoni, L / Blucher, E / Bock, G J / Cheu, E / Coleman, R / Corcoran, M D / Cox, B / Erwin, A R / Escobar, C O / Glazov, A / Golossanov, A / Gomes, R A / Gouffon, P / Hsiung, Y B / Jensen, D A / Kessler, R /
    Kotera, K / Ledovskoy, A / McBride, P L / Monnier, E / Nelson, K S / Nguyen, H / Niclasen, R / Phillips, D G / Ping, H / Ramberg, E J / Ray, R E / Ronquest, M / Santos, E / Slater, W / Smith, D / Solomey, N / Swallow, E C / Toale, P A / Tschirhart, R / Velissaris, C / Wah, Y W / Wang, J / White, H B / Whitmore, J / Wilking, M J / Winstein, B / Winston, R / Worcester, E T / Worcester, M / Yamanaka, T / Zimmerman, E D / Zukanovich, R F

    Physical review letters

    2007  Volume 99, Issue 8, Page(s) 81803

    Abstract: This Letter is the first report of the K{L}-->pi{+/-}e{-/+}nue{+}e{-} decay. Based on 19 208+/-144 events, we determine the branching fraction, B(K{L}-->pi{+/-}e{-/+}nue{+}e{-}M_{e{+}e{-}}>5 MeV/c{2},E{e{+}e{-}}{*}>30 MeV)=(1.285+/-0.041)x10{-5}, and ... ...

    Abstract This Letter is the first report of the K{L}-->pi{+/-}e{-/+}nue{+}e{-} decay. Based on 19 208+/-144 events, we determine the branching fraction, B(K{L}-->pi{+/-}e{-/+}nue{+}e{-}M_{e{+}e{-}}>5 MeV/c{2},E{e{+}e{-}}{*}>30 MeV)=(1.285+/-0.041)x10{-5}, and Gamma(K{e3ee}M{e{+}e{-}}>5 MeV/c{2})/Gamma(K{e3})=[4.57+/-0.04(stat)+/-0.14(syst)]x10{-5}. This ratio agrees with a theoretical prediction based on chiral perturbation theory (ChPT) calculated to O(p{4}). The measured kinematical distributions agree with those predicted by just ChPT O(p{4}), but show significant disagreement with ones predicted by leading-order ChPT.
    Language English
    Publishing date 2007-08-24
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.99.081803
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  9. Article: Measurement of the K0 charge radius and a CP-violating asymmetry and a search for CP-violating E1 direct photon emission in the rare decay KL--> pi+ pi- e+ e-.

    Abouzaid, E / Arenton, M / Barker, A R / Bellantoni, L / Bellavance, A / Blucher, E / Bock, G J / Cheu, E / Coleman, R / Corcoran, M D / Corti, G / Cox, B / Erwin, A R / Escobar, C O / Glazov, A / Golossanov, A / Gomes, R A / Gouffon, P / Hanagaki, K /
    Hsiung, Y B / Huang, H / Jensen, D A / Kessler, R / Kotera, K / Ledovskoy, A / McBride, P L / Monnier, E / Nelson, K S / Nguyen, H / Niclasen, R / Ping, H / Qi, X R / Ramberg, E J / Ray, R E / Ronquest, M / Santos, E / Shields, J / Slater, W / Smith, D / Solomey, N / Swallow, E C / Toale, P A / Tschirhart, R / Velissaris, C / Wah, Y W / Wang, J / White, H B / Whitmore, J / Wilking, M / Winstein, B / Winston, R / Worchester, E T / Worchester, M / Yamanaka, T / Zimmerman, E D / Zukanovich, R F

    Physical review letters

    2006  Volume 96, Issue 10, Page(s) 101801

    Abstract: Using the complete KTeV data set of 5,241 candidate K(L)--> pi(+) pi(-) e(+) e(-) decays (including an estimated background of 204 +/- 14 events), we have measured the coupling g(CR)= 0.163 +/- 0.0149(stat) +/- 0.023(syst) of the CP conserving charge ... ...

    Abstract Using the complete KTeV data set of 5,241 candidate K(L)--> pi(+) pi(-) e(+) e(-) decays (including an estimated background of 204 +/- 14 events), we have measured the coupling g(CR)= 0.163 +/- 0.0149(stat) +/- 0.023(syst) of the CP conserving charge radius process and from it determined a K(0) charge radius of <r(2)(K(0))> = [-0.077 +/- 0.007(stat) +/- 0.011(syst)]fm(2). We have determined a first experimental upper limit of 0.04 (90% C.L.) /g(e1)/ / /g(M1)/ of the couplings for the E1 and M1 direct photon emission processes. We also report the measurement of /g(M1)/ including a vector form factor /g(M1)/(1 + (a(1)/a(2))/((M(2)(p)-(M(2)(k))= 2M(K)E(gamma*)), where vector /g(M1)/= 1.11+/- 0.12(stat) +/- 0.08(syst) and a(1)/a(2) = [-0.744 +/- 0.027(stat) +/- 0.032(syst)] GeV(2)/c(2). Finally, a CP-violating asymmetry of [13.6 +/- 1.4(stat) +/- 1.5(syst)]% in the CP and T odd angle phi between the decay planes of the e(+) e(-) and pi(+) pi(-) pairs in the K(L) center of mass is reported.
    Language English
    Publishing date 2006-03-17
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.96.101801
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  10. Article ; Online: Features of the Energy Spectrum of Cosmic Rays above 2.5×10^{18}  eV Using the Pierre Auger Observatory.

    Aab, A / Abreu, P / Aglietta, M / Albury, J M / Allekotte, I / Almela, A / Alvarez Castillo, J / Alvarez-Muñiz, J / Alves Batista, R / Anastasi, G A / Anchordoqui, L / Andrada, B / Andringa, S / Aramo, C / Araújo Ferreira, P R / Asorey, H / Assis, P / Avila, G / Badescu, A M /
    Bakalova, A / Balaceanu, A / Barbato, F / Barreira Luz, R J / Becker, K H / Bellido, J A / Berat, C / Bertaina, M E / Bertou, X / Biermann, P L / Bister, T / Biteau, J / Blanco, A / Blazek, J / Bleve, C / Boháčová, M / Boncioli, D / Bonifazi, C / Bonneau Arbeletche, L / Borodai, N / Botti, A M / Brack, J / Bretz, T / Briechle, F L / Buchholz, P / Bueno, A / Buitink, S / Buscemi, M / Caballero-Mora, K S / Caccianiga, L / Calcagni, L / Cancio, A / Canfora, F / Caracas, I / Carceller, J M / Caruso, R / Castellina, A / Catalani, F / Cataldi, G / Cazon, L / Cerda, M / Chinellato, J A / Choi, K / Chudoba, J / Chytka, L / Clay, R W / Cobos Cerutti, A C / Colalillo, R / Coleman, A / Coluccia, M R / Conceição, R / Condorelli, A / Consolati, G / Contreras, F / Convenga, F / Covault, C E / Dasso, S / Daumiller, K / Dawson, B R / Day, J A / de Almeida, R M / de Jesús, J / de Jong, S J / De Mauro, G / de Mello Neto, J R T / De Mitri, I / de Oliveira, J / de Oliveira Franco, D / de Souza, V / De Vito, E / Debatin, J / Del Río, M / Deligny, O / Dembinski, H / Dhital, N / Di Giulio, C / Di Matteo, A / Díaz Castro, M L / Dobrigkeit, C / D'Olivo, J C / Dorosti, Q / Dos Anjos, R C / Dova, M T / Ebr, J / Engel, R / Epicoco, I / Erdmann, M / Escobar, C O / Etchegoyen, A / Falcke, H / Farmer, J / Farrar, G / Fauth, A C / Fazzini, N / Feldbusch, F / Fenu, F / Fick, B / Figueira, J M / Filipčič, A / Fodran, T / Freire, M M / Fujii, T / Fuster, A / Galea, C / Galelli, C / García, B / Garcia Vegas, A L / Gemmeke, H / Gesualdi, F / Gherghel-Lascu, A / Ghia, P L / Giaccari, U / Giammarchi, M / Giller, M / Glombitza, J / Gobbi, F / Gollan, F / Golup, G / Gómez Berisso, M / Gómez Vitale, P F / Gongora, J P / González, N / Goos, I / Góra, D / Gorgi, A / Gottowik, M / Grubb, T D / Guarino, F / Guedes, G P / Guido, E / Hahn, S / Halliday, R / Hampel, M R / Hansen, P / Harari, D / Harvey, V M / Haungs, A / Hebbeker, T / Heck, D / Hill, G C / Hojvat, C / Hörandel, J R / Horvath, P / Hrabovský, M / Huege, T / Hulsman, J / Insolia, A / Isar, P G / Johnsen, J A / Jurysek, J / Kääpä, A / Kampert, K H / Keilhauer, B / Kemp, J / Klages, H O / Kleifges, M / Kleinfeller, J / Köpke, M / Kukec Mezek, G / Lago, B L / LaHurd, D / Lang, R G / Leigui de Oliveira, M A / Lenok, V / Letessier-Selvon, A / Lhenry-Yvon, I / Lo Presti, D / Lopes, L / López, R / Lorek, R / Luce, Q / Lucero, A / Machado Payeras, A / Malacari, M / Mancarella, G / Mandat, D / Manning, B C / Manshanden, J / Mantsch, P / Marafico, S / Mariazzi, A G / Mariş, I C / Marsella, G / Martello, D / Martinez, H / Martínez Bravo, O / Mastrodicasa, M / Mathes, H J / Matthews, J / Matthiae, G / Mayotte, E / Mazur, P O / Medina-Tanco, G / Melo, D / Menshikov, A / Merenda, K-D / Michal, S / Micheletti, M I / Miramonti, L / Mockler, D / Mollerach, S / Montanet, F / Morello, C / Mostafá, M / Müller, A L / Muller, M A / Mulrey, K / Mussa, R / Muzio, M / Namasaka, W M / Nellen, L / Nguyen, P H / Niculescu-Oglinzanu, M / Niechciol, M / Nitz, D / Nosek, D / Novotny, V / Nožka, L / Nucita, A / Núñez, L A / Palatka, M / Pallotta, J / Panetta, M P / Papenbreer, P / Parente, G / Parra, A / Pech, M / Pedreira, F / Pȩkala, J / Pelayo, R / Peña-Rodriguez, J / Perez Armand, J / Perlin, M / Perrone, L / Peters, C / Petrera, S / Pierog, T / Pimenta, M / Pirronello, V / Platino, M / Pont, B / Pothast, M / Privitera, P / Prouza, M / Puyleart, A / Querchfeld, S / Rautenberg, J / Ravignani, D / Reininghaus, M / Ridky, J / Riehn, F / Risse, M / Ristori, P / Rizi, V / Rodrigues de Carvalho, W / Rodriguez Fernandez, G / Rodriguez Rojo, J / Roncoroni, M J / Roth, M / Roulet, E / Rovero, A C / Ruehl, P / Saffi, S J / Saftoiu, A / Salamida, F / Salazar, H / Salina, G / Sanabria Gomez, J D / Sánchez, F / Santos, E M / Santos, E / Sarazin, F / Sarmento, R / Sarmiento-Cano, C / Sato, R / Savina, P / Schäfer, C / Scherini, V / Schieler, H / Schimassek, M / Schimp, M / Schlüter, F / Schmidt, D / Scholten, O / Schovánek, P / Schröder, F G / Schröder, S / Schulz, A / Sciutto, S J / Scornavacche, M / Shellard, R C / Sigl, G / Silli, G / Sima, O / Šmída, R / Sommers, P / Soriano, J F / Souchard, J / Squartini, R / Stadelmaier, M / Stanca, D / Stanič, S / Stasielak, J / Stassi, P / Streich, A / Suárez-Durán, M / Sudholz, T / Suomijärvi, T / Supanitsky, A D / Šupík, J / Szadkowski, Z / Taboada, A / Tapia, A / Timmermans, C / Tkachenko, O / Tobiska, P / Todero Peixoto, C J / Tomé, B / Torralba Elipe, G / Travaini, A / Travnicek, P / Trimarelli, C / Trini, M / Tueros, M / Ulrich, R / Unger, M / Urban, M / Vaclavek, L / Vacula, M / Valdés Galicia, J F / Valiño, I / Valore, L / van Vliet, A / Varela, E / Vargas Cárdenas, B / Vásquez-Ramírez, A / Veberič, D / Ventura, C / Vergara Quispe, I D / Verzi, V / Vicha, J / Villaseñor, L / Vink, J / Vorobiov, S / Wahlberg, H / Watson, A A / Weber, M / Weindl, A / Wiencke, L / Wilczyński, H / Winchen, T / Wirtz, M / Wittkowski, D / Wundheiler, B / Yushkov, A / Zapparrata, O / Zas, E / Zavrtanik, D / Zavrtanik, M / Zehrer, L / Zepeda, A / Ziolkowski, M / Zuccarello, F

    Physical review letters

    2020  Volume 125, Issue 12, Page(s) 121106

    Abstract: We report a measurement of the energy spectrum of cosmic rays above 2.5×10^{18}  eV based on 215 030 events. New results are presented: at about 1.3×10^{19}  eV, the spectral index changes from 2.51±0.03(stat)±0.05(syst) to 3.05±0.05(stat)±0.10(syst), ... ...

    Abstract We report a measurement of the energy spectrum of cosmic rays above 2.5×10^{18}  eV based on 215 030 events. New results are presented: at about 1.3×10^{19}  eV, the spectral index changes from 2.51±0.03(stat)±0.05(syst) to 3.05±0.05(stat)±0.10(syst), evolving to 5.1±0.3(stat)±0.1(syst) beyond 5×10^{19}  eV, while no significant dependence of spectral features on the declination is seen in the accessible range. These features of the spectrum can be reproduced in models with energy-dependent mass composition. The energy density in cosmic rays above 5×10^{18}  eV is [5.66±0.03(stat)±1.40(syst)]×10^{53}  erg Mpc^{-3}.
    Language English
    Publishing date 2020-10-05
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.125.121106
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