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Article ; Online: Precise Measurement of Differential Cross Sections of the Σ^{-}p→Λn Reaction in Momentum Range 470-650 MeV/c.

Miwa, K / Ahn, J K / Akazawa, Y / Aramaki, T / Ashikaga, S / Callier, S / Chiga, N / Choi, S W / Ekawa, H / Evtoukhovitch, P / Fujioka, N / Fujita, M / Gogami, T / Harada, T / Hasegawa, S / Hayakawa, S H / Honda, R / Hoshino, S / Hosomi, K /

Ichikawa, M / Ichikawa, Y / Ieiri, M / Ikeda, M / Imai, K / Ishikawa, Y / Ishimoto, S / Jung, W S / Kajikawa, S / Kanauchi, H / Kanda, H / Kitaoka, T / Kang, B M / Kawai, H / Kim, S H / Kobayashi, K / Koike, T / Matsuda, K / Matsumoto, Y / Nagao, S / Nagatomi, R / Nakada, Y / Nakagawa, M / Nakamura, I / Nanamura, T / Naruki, M / Ozawa, S / Raux, L / Rogers, T G / Sakaguchi, A / Sakao, T / Sako, H / Sato, S / Shiozaki, T / Shirotori, K / Suzuki, K N / Suzuki, S / Tabata, M / Taille, C D L / Takahashi, H / Takahashi, T / Takahashi, T N / Tamura, H / Tanaka, M / Tanida, K / Tsamalaidze, Z / Ukai, M / Umetsu, H / Wada, S / Yamamoto, T O / Yoshida, J / Yoshimura, K

Physical review letters

2022 Volume 128, Issue 7, Page(s) 72501

Abstract: The differential cross sections of the Σ^{-}p→Λn reaction were measured accurately for the Σ^{-} momentum (p_{Σ}) ranging from 470 to 650 MeV/c at the J-PARC Hadron Experimental Facility. Precise angular information about the Σ^{-}p→Λn reaction was ... ...

Abstract	The differential cross sections of the Σ^{-}p→Λn reaction were measured accurately for the Σ^{-} momentum (p_{Σ}) ranging from 470 to 650 MeV/c at the J-PARC Hadron Experimental Facility. Precise angular information about the Σ^{-}p→Λn reaction was obtained for the first time by detecting approximately 100 reaction events at each angular step of Δcosθ=0.1. The obtained differential cross sections show a slightly forward-peaking structure in the measured momentum regions. The cross sections integrated for -0.7≤cosθ≤1.0 were obtained as 22.5±0.68 [statistical error(stat.)] ±0.65 [systematic error(syst.)] mb and 15.8±0.83(stat)±0.52(syst) mb for 470<p_{Σ}(MeV/c)<550 and 550<p_{Σ}(MeV/c)<650, respectively. These results show a drastic improvement compared with past measurements of the hyperon-proton scattering experiments. They will play essential roles in updating the theoretical models of the baryon-baryon interactions.<br />
Language	English
Publishing date	2022-03-04
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.128.072501
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Article ; Online: First Determination of the Level Structure of an sd-Shell Hypernucleus, _{Λ}^{19}F.

Yang, S B / Ahn, J K / Akazawa, Y / Aoki, K / Chiga, N / Ekawa, H / Evtoukhovitch, P / Feliciello, A / Fujita, M / Hasegawa, S / Hayakawa, S / Hayakawa, T / Honda, R / Hosomi, K / Hwang, S H / Ichige, N / Ichikawa, Y / Ikeda, M / Imai, K /

Ishimoto, S / Kanatsuki, S / Kim, S H / Kinbara, S / Kobayashi, K / Koike, T / Lee, J Y / Miwa, K / Moon, T J / Nagae, T / Nakada, Y / Nakagawa, M / Ogura, Y / Sakaguchi, A / Sako, H / Sasaki, Y / Sato, S / Shirotori, K / Sugimura, H / Suto, S / Suzuki, S / Takahashi, T / Tamura, H / Tanida, K / Togawa, Y / Tsamalaidze, Z / Ukai, M / Wang, T F / Yamamoto, T O

Physical review letters

2018 Volume 120, Issue 13, Page(s) 132505

Abstract: We report on the first observation of γ rays emitted from an sd-shell hypernucleus, _{Λ}^{19}F. The energy spacing between the ground state doublet, 1/2^{+} and 3/2^{+} states, of _{Λ}^{19}F is determined to be 315.5±0.4(stat)_{-0.5}^{+0.6}(syst) keV by ...

Abstract	We report on the first observation of γ rays emitted from an sd-shell hypernucleus, _{Λ}^{19}F. The energy spacing between the ground state doublet, 1/2^{+} and 3/2^{+} states, of _{Λ}^{19}F is determined to be 315.5±0.4(stat)_{-0.5}^{+0.6}(syst) keV by measuring the γ-ray energy of the M1(3/2^{+}→1/2^{+}) transition. In addition, three γ-ray peaks are observed and assigned as E2(5/2^{+}→1/2^{+}), E1(1/2^{-}→1/2^{+}), and E1(1/2^{-}→3/2^{+}) transitions. The excitation energies of the 5/2^{+} and 1/2^{-} states are determined to be 895.2±0.3(stat)±0.5(syst) and 1265.6±1.2(stat)_{-0.5}^{+0.7}(syst) keV, respectively. It is found that the ground state doublet spacing is well described by theoretical models based on existing s- and p-shell hypernuclear data.
Language	English
Publishing date	2018-03-30
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.120.132505
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Book ; Online: Machine Learning based tool for CMS RPC currents quality monitoring

Shumka, E. / Samalan, A. / Tytgat, M. / Sawy, M. El / Alves, G. A. / Marujo, F. / Coelho, E. A. / Da Costa, E. M. / Nogima, H. / Santoro, A. / De Souza, S. Fonseca / Damiao, D. De Jesus / Thiel, M. / Amarilo, K. Mota / Filho, M. Barroso Ferreira / Aleksandrov, A. / Hadjiiska, R. / Iaydjiev, P. / Rodozov, M. /

Shopova, M. / Soultanov, G. / Dimitrov, A. / Litov, L. / Pavlov, B. / Petkov, P. / Petrov, A. / Qian, S. J. / Kou, H. / Liu, Z. -A. / Zhao, J. / Song, J. / Hou, Q. / Diao, W. / Cao, P. / Avila, C. / Barbosa, D. / Cabrera, A. / Florez, A. / Fraga, J. / Reyes, J. / Assran, Y. / Mahmoud, M. A. / Mohammed, Y. / Crotty, I. / Laktineh, I. / Grenier, G. / Gouzevitch, M. / Mirabito, L. / Shchablo, K. / Bagaturia, I. / Lomidze, I. / Tsamalaidze, Z. / Amoozegar, V. / Boghrati, B. / Ebraimi, M. / Najafabadi, M. Mohammadi / Zareian, E. / Abbrescia, M. / Iaselli, G. / Pugliese, G. / Loddo, F. / De Filippis, N. / Aly, R. / Ramos, D. / Elmetenawee, W. / Leszki, S. / Margjeka, I. / Paesani, D. / Benussi, L. / Bianco, S. / Piccolo, D. / Meola, S. / Buontempo, S. / Carnevali, F. / Lista, L. / Paolucci, P. / Fienga, F. / Braghieri, A. / Salvini, P. / Montagna, P. / Riccardi, C. / Vitulo, P. / Asilar, E. / Choi, J. / Kim, T. J. / Choi, S. Y. / Hong, B. / Lee, K. S. / Oh, H. Y. / Goh, J. / Yu, I. / Estrada, C. Uribe / Pedraza, I. / Castilla-Valdez, H. / Sanchez-Hernandez, A. / Fernandez, R. L. / Ramirez-Garcia, M. / Vazquez, E. / Shah, M. A. / Zaganidis, N. / Radi, A. / Hoorani, H. / Muhammad, S. / Ahmad, A. / Asghar, I. / Khan, W. A. / Eysermans, J. / De Araujo, F. Torres Da Silva

2023

Abstract: The muon system of the CERN Compact Muon Solenoid (CMS) experiment includes more than a thousand Resistive Plate Chambers (RPC). They are gaseous detectors operated in the hostile environment of the CMS underground cavern on the Large Hadron Collider ... ...

Abstract	The muon system of the CERN Compact Muon Solenoid (CMS) experiment includes more than a thousand Resistive Plate Chambers (RPC). They are gaseous detectors operated in the hostile environment of the CMS underground cavern on the Large Hadron Collider where pp luminosities of up to $2\times 10^{34}$ $\text{cm}^{-2}\text{s}^{-1}$ are routinely achieved. The CMS RPC system performance is constantly monitored and the detector is regularly maintained to ensure stable operation. The main monitorable characteristics are dark current, efficiency for muon detection, noise rate etc. Herein we describe an automated tool for CMS RPC current monitoring which uses Machine Learning techniques. We further elaborate on the dedicated generalized linear model proposed already and add autoencoder models for self-consistent predictions as well as hybrid models to allow for RPC current predictions in a distant future.
Keywords	Physics - Instrumentation and Detectors ; High Energy Physics - Experiment
Subject code	621
Publishing date	2023-02-06
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Observation of Spin-Dependent Charge Symmetry Breaking in ΛN Interaction: Gamma-Ray Spectroscopy of _{Λ}^{4}He.

Yamamoto, T O / Agnello, M / Akazawa, Y / Amano, N / Aoki, K / Botta, E / Chiga, N / Ekawa, H / Evtoukhovitch, P / Feliciello, A / Fujita, M / Gogami, T / Hasegawa, S / Hayakawa, S H / Hayakawa, T / Honda, R / Hosomi, K / Hwang, S H / Ichige, N /

Ichikawa, Y / Ikeda, M / Imai, K / Ishimoto, S / Kanatsuki, S / Kim, M H / Kim, S H / Kinbara, S / Koike, T / Lee, J Y / Marcello, S / Miwa, K / Moon, T / Nagae, T / Nagao, S / Nakada, Y / Nakagawa, M / Ogura, Y / Sakaguchi, A / Sako, H / Sasaki, Y / Sato, S / Shiozaki, T / Shirotori, K / Sugimura, H / Suto, S / Suzuki, S / Takahashi, T / Tamura, H / Tanabe, K / Tanida, K / Tsamalaidze, Z / Ukai, M / Yamamoto, Y / Yang, S B

Physical review letters

2015 Volume 115, Issue 22, Page(s) 222501

Abstract: The energy spacing between the spin-doublet bound state of _{Λ}^{4}He(1^{+},0^{+}) was determined to be 1406±2±2 keV, by measuring γ rays for the 1^{+}→0^{+} transition with a high efficiency germanium detector array in coincidence with the ^{4}He(K^{-}, ...

Abstract	The energy spacing between the spin-doublet bound state of _{Λ}^{4}He(1^{+},0^{+}) was determined to be 1406±2±2 keV, by measuring γ rays for the 1^{+}→0^{+} transition with a high efficiency germanium detector array in coincidence with the ^{4}He(K^{-},π^{-})_{Λ}^{4}He reaction at J-PARC. In comparison to the corresponding energy spacing in the mirror hypernucleus _{Λ}^{4}H, the present result clearly indicates the existence of charge symmetry breaking (CSB) in ΛN interaction. By combining the energy spacings with the known ground-state binding energies, it is also found that the CSB effect is large in the 0^{+} ground state but is vanishingly small in the 1^{+} excited state, demonstrating that the ΛN CSB interaction has spin dependence.
Language	English
Publishing date	2015-11-27
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.115.222501
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Demonstration of Single-Barium-Ion Sensitivity for Neutrinoless Double-Beta Decay Using Single-Molecule Fluorescence Imaging.

McDonald, A D / Jones, B J P / Nygren, D R / Adams, C / Álvarez, V / Azevedo, C D R / Benlloch-Rodríguez, J M / Borges, F I G M / Botas, A / Cárcel, S / Carrión, J V / Cebrián, S / Conde, C A N / Díaz, J / Diesburg, M / Escada, J / Esteve, R / Felkai, R / Fernandes, L M P /

Ferrario, P / Ferreira, A L / Freitas, E D C / Goldschmidt, A / Gómez-Cadenas, J J / González-Díaz, D / Gutiérrez, R M / Guenette, R / Hafidi, K / Hauptman, J / Henriques, C A O / Hernandez, A I / Hernando Morata, J A / Herrero, V / Johnston, S / Labarga, L / Laing, A / Lebrun, P / Liubarsky, I / López-March, N / Losada, M / Martín-Albo, J / Martínez-Lema, G / Martínez, A / Monrabal, F / Monteiro, C M B / Mora, F J / Moutinho, L M / Muñoz Vidal, J / Musti, M / Nebot-Guinot, M / Novella, P / Palmeiro, B / Para, A / Pérez, J / Querol, M / Repond, J / Renner, J / Riordan, S / Ripoll, L / Rodríguez, J / Rogers, L / Santos, F P / Dos Santos, J M F / Simón, A / Sofka, C / Sorel, M / Stiegler, T / Toledo, J F / Torrent, J / Tsamalaidze, Z / Veloso, J F C A / Webb, R / White, J T / Yahlali, N

Physical review letters

2018 Volume 120, Issue 13, Page(s) 132504

Abstract: A new method to tag the barium daughter in the double-beta decay of ^{136}Xe is reported. Using the technique of single molecule fluorescent imaging (SMFI), individual barium dication (Ba^{++}) resolution at a transparent scanning surface is demonstrated. ...

Abstract	A new method to tag the barium daughter in the double-beta decay of ^{136}Xe is reported. Using the technique of single molecule fluorescent imaging (SMFI), individual barium dication (Ba^{++}) resolution at a transparent scanning surface is demonstrated. A single-step photobleach confirms the single ion interpretation. Individual ions are localized with superresolution (∼2 nm), and detected with a statistical significance of 12.9σ over backgrounds. This lays the foundation for a new and potentially background-free neutrinoless double-beta decay technology, based on SMFI coupled to high pressure xenon gas time projection chambers.
Language	English
Publishing date	2018-03-30
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.120.132504
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: New precise measurement of the pion weak form factors in pi+-->e+ nugamma decay.

Bychkov, M / Pocanić, D / Vandevender, B A / Baranov, V A / Bertl, W / Bystritsky, Yu M / Frlez, E / Kalinnikov, V A / Khomutov, N V / Korenchenko, A S / Korenchenko, S M / Korolija, M / Kozlowski, T / Kravchuk, N P / Kuchinsky, N A / Li, W / Mekterović, D / Mzhavia, D / Ritt, S /

Robmann, P / Rondon-Aramayo, O A / Rozhdestvensky, A M / Sakhelashvili, T / Scheu, S / Straumann, U / Supek, I / Tsamalaidze, Z / van der Schaaf, A / Velicheva, E P / Volnykh, V P / Wang, Y / Wirtz, H-P

Physical review letters

2009 Volume 103, Issue 5, Page(s) 51802

Abstract: We have measured the pi+-->e+ nugamma branching ratio over a wide region of phase space, based on a total of 65 460 events acquired using the PIBETA detector. Minimum-chi2 fits to the measured (E(e+), E(gamma) energy distributions result in the weak form ...

Abstract	We have measured the pi+-->e+ nugamma branching ratio over a wide region of phase space, based on a total of 65 460 events acquired using the PIBETA detector. Minimum-chi2 fits to the measured (E(e+), E(gamma) energy distributions result in the weak form factor value of F(A)=0.0119(1) with a fixed value of F(V)=0.0259. An unconstrained fit yields F(V)=0.0258(17) and F(A)=0.0117(17). In addition, we have measured a=0.10(6) for the dependence of F(V) on q2, the e+ nu pair invariant mass squared, parametrized as F(V)(q2)=F(V)(0)(1+aq(2)). The branching ratio for the kinematic region E(gamma)>10 MeV and theta(e(+)gamma)>40 degrees is measured to be B(expt)=73.86(54)x10(-8). Earlier deviations we reported in the high-E(gamma)-low-E(e+) kinematic region are resolved without a tensor term. We also derive new values for the pion polarizability alpha(E)=2.78(10)x10(-4) fm3 and neutral pion lifetime tau(pi0)=(8.5+/-1.1)x10(-17) s.
Language	English
Publishing date	2009-07-31
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.103.051802
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Book ; Online: New studies of allowed pion and muon decays

Pocanic, D. / Palladino, A. / Alonzi, L. P. / Baranov, V. A. / Bertl, W. / Bychkov, M. / Bystritsky, Yu. M. / Frlez, E. / Kalinnikov, V. A. / Khomutov, N. V. / Korenchenko, A. S. / Korenchenko, S. M. / Korolija, M. / Kozlowski, T. / Kravchuk, N. P. / Kuchinsky, N. A. / Lehman, M. C. / Mekterovic, D. / Munyangabe, E. /

Mzhavia, D. / Robmann, P. / Rozhdestvensky, A. M. / Shkarovskiy, S. N. / Straumann, U. / Supek, I. / Truöl, P. / Tsamalaidze, Z. / van der Schaaf, A. / Velicheva, E. P. / Volnykh, V. P.

2012

Abstract: Building on the rare pion and muon decay results of the PIBETA experiment, the PEN collaboration has undertaken a precise measurement of B_{\pi e2} = R^\pi_{e/\mu}, the \pi^+ -> e^+\nu(\gamma) decay branching ratio, at the Paul Scherrer Institute, to ... ...

Abstract	Building on the rare pion and muon decay results of the PIBETA experiment, the PEN collaboration has undertaken a precise measurement of B_{\pi e2} = R^\pi_{e/\mu}, the \pi^+ -> e^+\nu(\gamma) decay branching ratio, at the Paul Scherrer Institute, to reduce the present 40\times experimental precision lag behind theory to ~ 6-7\times. Because of large helicity suppression, R^\pi_{e/\mu} is uniquely sensitive to contributions from non-(V-A) physics, making this decay a particularly suitable subject of study. Even at current precision, the experimental value of B_{\pi e2} provides the most accurate test of lepton universality available. During runs in 2008-10, PEN has accumulated over 2\times 10^7 \pi_{e2} events; a comprehensive maximum-likelihood analysis is currently under way. The new data will also lead to improved precision of the earlier PIBETA results on radiative \pi and \mu decays. Comment: 3 pages, 3 figures, to appear in Proceedings, 11th Conference on the Intersections of Particle and Nuclear Physics (CIPANP 2012), held at St. Petersburg, Florida, 29 May - 3 June 2012
Keywords	High Energy Physics - Experiment ; Nuclear Experiment
Subject code	612
Publishing date	2012-10-18
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Search for the Θ+ pentaquark via the π(-)p→K(-)X reaction at 1.92 GeV/c.

Shirotori, K / Takahashi, T N / Adachi, S / Agnello, M / Ajimura, S / Aoki, K / Bhang, H C / Bassalleck, B / Botta, E / Bufalino, S / Chiga, N / Evtoukhovitch, P / Feliciello, A / Fujioka, H / Hiruma, F / Honda, R / Hosomi, K / Ichikawa, Y / Ieiri, M /

Igarashi, Y / Imai, K / Ishibashi, N / Ishimoto, S / Itahashi, K / Iwasaki, R / Joo, C W / Kim, M J / Kim, S J / Kiuchi, R / Koike, T / Komatsu, Y / Kulikov, V V / Marcello, S / Masumoto, S / Matsuoka, K / Miwa, K / Moritsu, M / Nagae, T / Naruki, M / Niiyama, M / Noumi, H / Ozawa, K / Saito, N / Sakaguchi, A / Sako, H / Samoilov, V / Sato, M / Sato, S / Sato, Y / Sawada, S / Sekimoto, M / Sugimura, H / Suzuki, S / Takahashi, H / Takahashi, T / Tamura, H / Tanaka, T / Tanida, K / Tokiyasu, A O / Tomida, N / Tsamalaidze, Z / Ukai, M / Yagi, K / Yamamoto, T O / Yang, S B / Yonemoto, Y / Yoon, C J / Yoshida, K

Physical review letters

2012 Volume 109, Issue 13, Page(s) 132002

Abstract: The Θ(+) pentaquark baryon was searched for via the π(-)p→K(-)X reaction with a missing mass resolution of 1.4 MeV/c(2) (FWHM) at the Japan Proton Accelerator Research Complex (J-PARC). π(-) meson beams were incident on the liquid hydrogen target with a ... ...

Abstract	The Θ(+) pentaquark baryon was searched for via the π(-)p→K(-)X reaction with a missing mass resolution of 1.4 MeV/c(2) (FWHM) at the Japan Proton Accelerator Research Complex (J-PARC). π(-) meson beams were incident on the liquid hydrogen target with a beam momentum of 1.92 GeV/c. No peak structure corresponding to the Θ(+) mass was observed. The upper limit of the production cross section averaged over the scattering angle of 2° to 15° in the laboratory frame is obtained to be 0.26 μb/sr in the mass region of 1.51-1.55 GeV/c(2). The upper limit of the Θ(+) decay width is obtained to be 0.72 and 3.1 MeV for J(Θ)(P)=1/2(+) and J(Θ)(P)=1/2(-), respectively, using the effective Lagrangian approach.
Language	English
Publishing date	2012-09-28
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.109.132002
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Precise measurement of the pi+-->pi0 e+nu branching ratio.

Pocanić, D / Frlez, E / Baranov, V A / Bertl, W / Brönnimann, Ch / Bychkov, M / Crawford, J F / Daum, M / Khomutov, N V / Korenchenko, A S / Korenchenko, S M / Kozlowski, T / Kravchuk, N P / Kuchinsky, N A / Li, W / Minehart, R C / Mzhavia, D / Ritchie, B G / Ritt, S /

Rozhdestvensky, A M / Sidorkin, V V / Smith, L C / Supek, I / Tsamalaidze, Z / VanDevender, B A / Wang, Y / Wirtz, H-P / Ziock, K O H

Physical review letters

2004 Volume 93, Issue 18, Page(s) 181803

Abstract: Using a large acceptance calorimeter and a stopped pion beam we have made a precise measurement of the rare pi(+)-->pi(0)e(+)nu (pi(beta)) decay branching ratio. We have evaluated the branching ratio by normalizing the number of observed pi(beta) decays ... ...

Abstract	Using a large acceptance calorimeter and a stopped pion beam we have made a precise measurement of the rare pi(+)-->pi(0)e(+)nu (pi(beta)) decay branching ratio. We have evaluated the branching ratio by normalizing the number of observed pi(beta) decays to the number of observed pi(+)-->e(+)nu (pi(e2)) decays. We find the value of Gamma(pi(+)-->pi(0)e(+)nu)/Gamma(total)=[1.036+/-0.004(stat)+/-0.004(syst)+/-0.003(pi(e2))]x10(-8), where the first uncertainty is statistical, the second systematic, and the third is the pi(e2) branching ratio uncertainty. Our result agrees well with the standard model prediction.
Language	English
Publishing date	2004-10-29
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.93.181803
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Precise measurement of the pion axial form factor in the pi+-->e+nugamma decay.

Physical review letters

2004 Volume 93, Issue 18, Page(s) 181804

Abstract: We have studied radiative pion decays pi(+)-->e(+)nugamma in three broad kinematic regions using the PIBETA detector and a stopped pion beam. Based on Dalitz distributions of 41 601 events we have evaluated absolute pi-->enugamma branching ratios in the ... ...

Abstract	We have studied radiative pion decays pi(+)-->e(+)nugamma in three broad kinematic regions using the PIBETA detector and a stopped pion beam. Based on Dalitz distributions of 41 601 events we have evaluated absolute pi-->enugamma branching ratios in the three regions. Minimum chi(2) fits to the integral and differential (E(e(+)),E(gamma)) distributions result in the axial-to-vector weak form factor ratio of gamma identical with F(A)/F(V)=0.443(15), or F(A)=0.0115(4) with F(V)=0.0259. However, deviations from standard model predictions in the high-E(gamma)-low-E(e(+)) kinematic region indicate the need for further theoretical and experimental work.
Language	English
Publishing date	2004-10-29
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.93.181804
Database	MEDical Literature Analysis and Retrieval System OnLINE

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