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Article ; Online: Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction.

Li, W B / Huber, G M / Blok, H P / Gaskell, D / Horn, T / Semenov-Tian-Shansky, K / Pire, B / Szymanowski, L / Laget, J-M / Aniol, K / Arrington, J / Beise, E J / Boeglin, W / Brash, E J / Breuer, H / Chang, C C / Christy, M E / Ent, R / Gibson, E F /

Holt, R J / Jin, S / Jones, M K / Keppel, C E / Kim, W / King, P M / Kovaltchouk, V / Liu, J / Lolos, G J / Mack, D J / Margaziotis, D J / Markowitz, P / Matsumura, A / Meekins, D / Miyoshi, T / Mkrtchyan, H / Niculescu, I / Okayasu, Y / Pentchev, L / Perdrisat, C / Potterveld, D / Punjabi, V / Reimer, P E / Reinhold, J / Roche, J / Roos, P G / Sarty, A / Smith, G R / Tadevosyan, V / Tang, L G / Tvaskis, V / Volmer, J / Vulcan, W / Warren, G / Wood, S A / Xu, C / Zheng, X

Physical review letters

2019 Volume 123, Issue 18, Page(s) 182501

Abstract: Backward-angle meson electroproduction above the resonance region, which was previously ignored, is anticipated to offer unique access to the three quark plus sea component of the nucleon wave function. In this Letter, we present the first complete ... ...

Abstract	Backward-angle meson electroproduction above the resonance region, which was previously ignored, is anticipated to offer unique access to the three quark plus sea component of the nucleon wave function. In this Letter, we present the first complete separation of the four electromagnetic structure functions above the resonance region in exclusive ω electroproduction off the proton, ep→e^{'}pω, at central Q^{2} values of 1.60, 2.45 GeV^{2}, at W=2.21 GeV. The results of our pioneering -u≈-u_{min} study demonstrate the existence of a unanticipated backward-angle cross section peak and the feasibility of full L/T/LT/TT separations in this never explored kinematic territory. At Q^{2}=2.45 GeV^{2}, the observed dominance of σ_{T} over σ_{L}, is qualitatively consistent with the collinear QCD description in the near-backward regime, in which the scattering amplitude factorizes into a hard subprocess amplitude and baryon to meson transition distribution amplitudes: universal nonperturbative objects only accessible through backward-angle kinematics.
Language	English
Publishing date	2019-11-25
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.123.182501
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Article ; Online: Probing the high momentum component of the deuteron at high Q2.

Boeglin, W U / Coman, L / Ambrozewicz, P / Aniol, K / Arrington, J / Batigne, G / Bosted, P / Camsonne, A / Chang, G / Chen, J P / Choi, S / Deur, A / Epstein, M / Finn, J M / Frullani, S / Furget, C / Garibaldi, F / Gayou, O / Gilman, R /

Hansen, O / Hayes, D / Higinbotham, D W / Hinton, W / Hyde, C / Ibrahim, H / de Jager, C W / Jiang, X / Jones, M K / Kaufman, L J / Klein, A / Kox, S / Kramer, L / Kumbartzki, G / Laget, J M / LeRose, J / Lindgren, R / Margaziotis, D J / Markowitz, P / McCormick, K / Meziani, Z / Michaels, R / Milbrath, B / Mitchell, J / Monaghan, P / Moteabbed, M / Moussiegt, P / Nasseripour, R / Paschke, K / Perdrisat, C / Piasetzky, E / Punjabi, V / Qattan, I A / Quéméner, G / Ransome, R D / Raue, B / Réal, J S / Reinhold, J / Reitz, B / Roché, R / Roedelbronn, M / Saha, A / Slifer, K / Solvignon, P / Sulkosky, V / Ulmer, P E / Voutier, E / Weinstein, L B / Wojtsekhowski, B / Zeier, M

Physical review letters

2011 Volume 107, Issue 26, Page(s) 262501

Abstract: The (2)H(e,e'p)n cross section at a momentum transfer of 3.5 (GeV/c)(2) was measured over a kinematical range that made it possible to study this reaction for a set of fixed missing momenta as a function of the neutron recoil angle θ(nq) and to extract ... ...

Abstract	The (2)H(e,e'p)n cross section at a momentum transfer of 3.5 (GeV/c)(2) was measured over a kinematical range that made it possible to study this reaction for a set of fixed missing momenta as a function of the neutron recoil angle θ(nq) and to extract missing momentum distributions for fixed values of θ(nq) up to 0.55 GeV/c. In the region of 35°≤θ(nq)≤45° recent calculations, which predict that final-state interactions are small, agree reasonably well with the experimental data. Therefore, these experimental reduced cross sections provide direct access to the high momentum component of the deuteron momentum distribution in exclusive deuteron electrodisintegration.
Language	English
Publishing date	2011-12-23
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.107.262501
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Article: Double pi(0) Photoproduction on the Proton at GRAAL.

Assafiri, Y / Bartalini, O / Bellini, V / Bocquet, J P / Bouchigny, S / Capogni, M / Castoldi, M / D'Angelo, A / Didelez, J P / Di Salvo, R / Fantini, A / Fichen, L / Gervino, G / Ghio, F / Girolami, B / Giusa, A / Guidal, M / Hourany, E / Kouznetsov, V /

Kunne, R / Laget, J-M / Lapik, A / Sandri, P Levi / Lleres, A / Moricciani, D / Nedorezov, V / Rebreyend, D / Randieri, C / Renard, F / Rudnev, N / Schaerf, C / Sperduto, M / Sutera, M / Turinge, A / Zucchiatti, A

Physical review letters

2003 Volume 90, Issue 22, Page(s) 222001

Abstract: The double pi(0) photoproduction off the proton has been measured in the beam energy range of 0.65-1.5 GeV. The total and differential cross sections and the Sigma beam asymmetry were extracted. The total cross section measured for the first time in the ... ...

Abstract	The double pi(0) photoproduction off the proton has been measured in the beam energy range of 0.65-1.5 GeV. The total and differential cross sections and the Sigma beam asymmetry were extracted. The total cross section measured for the first time in the third resonance region of the nucleon shows a prominent peak. The interpretation of these results by two independent theoretical models infers mostly the selective excitation of P11- and D13-nucleon resonances.
Language	English
Publishing date	2003-06-06
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.90.222001
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Electron-induced neutron knockout from 4He.

Misiejuk, A / Papandreou, Z / Voutier, E / Bauer, Th S / Blok, H P / Boersma, D J / Den Bok, H W / Bruins, E E W / Farzanpay, F / Grüner, K / Hesselink, W H A / Huber, G M / Jans, E / Kalantar-Nayestanaki, N / Kasdorp, W-J / Konijn, J / Laget, J-M / Lapikás, L / Lolos, G J /

Onderwater, G J G / Pellegrino, A / Schroevers, R / Spaltro, C M / Starink, R / van der Steenhoven, G / Steiger, J J M / Visschers, J L / Willering, H W / Yeomans, D M

Physical review letters

2002 Volume 89, Issue 17, Page(s) 172501

Abstract: The differential cross section for electron-induced neutron knockout in the reaction 4He(e,e(')n)(3)He has been measured for the first time with a statistical accuracy of 11%. The experiment was performed in quasielastic kinematics at a momentum transfer ...

Abstract	The differential cross section for electron-induced neutron knockout in the reaction 4He(e,e(')n)(3)He has been measured for the first time with a statistical accuracy of 11%. The experiment was performed in quasielastic kinematics at a momentum transfer of 300 MeV/c and in the missing-momentum range of 25-70 MeV/c. The comparison of the data with theoretical calculations shows an impressive increase of the cross section resulting from final state interaction effects. Specifically, the p-n charge-exchange process dominates the cross section in this kinematical regime.
Language	English
Publishing date	2002-10-21
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.89.172501
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Quasielastic 3He(e,e'p)2H reaction at Q2 = 1.5 GeV2 for recoil momenta up to 1 GeV/c.

Rvachev, M M / Benmokhtar, F / Penel-Nottaris, E / Aniol, K A / Bertozzi, W / Boeglin, W U / Butaru, F / Calarco, J R / Chai, Z / Chang, C C / Chen, J-P / Chudakov, E / Cisbani, E / Cochran, A / Cornejo, J / Dieterich, S / Djawotho, P / Duran, W / Epstein, M B /

Finn, J M / Fissum, K G / Frahi-Amroun, A / Frullani, S / Furget, C / Garibaldi, F / Gayou, O / Gilad, S / Gilman, R / Glashausser, C / Hansen, J-O / Higinbotham, D W / Hotta, A / Hu, B / Iodice, M / Iomni, R / de Jager, C W / Jiang, X / Jones, M K / Kelly, J J / Kox, S / Kuss, M / Laget, J M / De Leo, R / Lerose, J J / Liatard, E / Lindgren, R / Liyanage, N / Lourie, R W / Malov, S / Margaziotis, D J / Markowitz, P / Merchez, F / Michaels, R / Mitchell, J / Mougey, J / Perdrisat, C F / Punjabi, V A / Quéméner, G / Ransome, R D / Réal, J-S / Roché, R / Sabatié, F / Saha, A / Simon, D / Strauch, S / Suleiman, R / Tamae, T / Templon, J A / Tieulent, R / Ueno, H / Ulmer, P E / Urciuoli, G M / Voutier, E / Wijesooriya, K / Wojtsekhowski, B

Physical review letters

2005 Volume 94, Issue 19, Page(s) 192302

Abstract: We have studied the quasielastic 3He(e,e(')p)2H reaction in perpendicular coplanar kinematics, with the energy and the momentum transferred by the electron fixed at 840 MeV and 1502 MeV/c, respectively. The 3He(e,e(')p)2H cross section was measured for ... ...

Abstract	We have studied the quasielastic 3He(e,e(')p)2H reaction in perpendicular coplanar kinematics, with the energy and the momentum transferred by the electron fixed at 840 MeV and 1502 MeV/c, respectively. The 3He(e,e(')p)2H cross section was measured for missing momenta up to 1000 MeV/c, while the A(TL) asymmetry was extracted for missing momenta up to 660 MeV/c. For missing momenta up to 150 MeV/c, the cross section is described by variational calculations using modern 3He wave functions. For missing momenta from 150 to 750 MeV/c, strong final-state interaction effects are observed. Near 1000 MeV/c, the experimental cross section is more than an order of magnitude larger than predicted by available theories. The A(TL) asymmetry displays characteristic features of broken factorization with a structure that is similar to that generated by available models.
Language	English
Publishing date	2005-05-20
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.94.192302
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Article: Measurement of the 3He(e,e'p)pn reaction at high missing energies and momenta.

Benmokhtar, F / Rvachev, M M / Penel-Nottaris, E / Aniol, K A / Bertozzi, W / Boeglin, W U / Butaru, F / Calarco, J R / Chai, Z / Chang, C C / Chen, J-P / Chudakov, E / Cisbani, E / Cochran, A / Cornejo, J / Dieterich, S / Djawotho, P / Duran, W / Epstein, M B /

Physical review letters

2005 Volume 94, Issue 8, Page(s) 82305

Abstract: Results of the Jefferson Lab Hall A quasielastic 3He(e,e'p)pn measurements are presented. These measurements were performed at fixed transferred momentum and energy, q=1502 MeV/c and omega=840 MeV, respectively, for missing momenta p(m) up to 1 GeV/c and ...

Abstract	Results of the Jefferson Lab Hall A quasielastic 3He(e,e'p)pn measurements are presented. These measurements were performed at fixed transferred momentum and energy, q=1502 MeV/c and omega=840 MeV, respectively, for missing momenta p(m) up to 1 GeV/c and missing energies in the continuum region, up to pion threshold; this kinematic coverage is much more extensive than that of any previous experiment. The cross section data are presented along with the effective momentum density distribution and compared to theoretical models.
Language	English
Publishing date	2005-03-04
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.94.082305
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Article ; Online: Tensor correlations measured in 3He(e,e' pp)n.

Baghdasaryan, H / Weinstein, L B / Laget, J M / Adhikari, K P / Aghasyan, M / Amarian, M / Anghinolfi, M / Avakian, H / Ball, J / Battaglieri, M / Bedlinskiy, I / Bennett, R P / Berman, B L / Biselli, A S / Bookwalter, C / Briscoe, W J / Brooks, W K / Bültmann, S / Burkert, V D /

Carman, D S / Crede, V / D'Angelo, A / Daniel, A / Dashyan, N / De Vita, R / De Sanctis, E / Deur, A / Dey, B / Dickson, R / Djalali, C / Dodge, G E / Doughty, D / Dupre, R / Egiyan, H / El Alaoui, A / El Fassi, L / Eugenio, P / Fegan, S / Gabrielyan, M Y / Gilfoyle, G P / Giovanetti, K L / Gohn, W / Gothe, R W / Griffioen, K A / Guidal, M / Guo, L / Gyurjyan, V / Hakobyan, H / Hanretty, C / Hyde, C E / Hicks, K / Holtrop, M / Ilieva, Y / Ireland, D G / Joo, K / Keller, D / Khandaker, M / Khetarpal, P / Kim, A / Kim, W / Klein, A / Klein, F J / Konczykowski, P / Kubarovsky, V / Kuhn, S E / Kuleshov, S V / Kuznetsov, V / Kvaltine, N D / Livingston, K / Lu, H Y / Macgregor, I J D / Markov, N / Mayer, M / McAndrew, J / McKinnon, B / Meyer, C A / Mikhailov, K / Mokeev, V / Moreno, B / Moriya, K / Morrison, B / Moutarde, H / Munevar, E / Nadel-Turonski, P / Nepali, C / Niccolai, S / Niculescu, G / Niculescu, I / Osipenko, M / Ostrovidov, A I / Paremuzyan, R / Park, K / Park, S / Pasyuk, E / Pereira, S Anefalos / Pisano, S / Pogorelko, O / Pozdniakov, S / Price, J W / Procureur, S / Protopopescu, D / Ricco, G / Ripani, M / Rosner, G / Rossi, P / Sabatié, F / Salgado, C / Schumacher, R A / Seraydaryan, H / Smith, G D / Sober, D I / Sokhan, D / Stepanyan, S S / Stepanyan, S / Stoler, P / Strauch, S / Taiuti, M / Tang, W / Taylor, C E / Tedeschi, D J / Ungaro, M / Vineyard, M F / Voutier, E / Watts, D P / Weygand, D P / Wood, M H / Zhao, B / Zhao, Z W

Physical review letters

2010 Volume 105, Issue 22, Page(s) 222501

Abstract: We have measured the 3He(e,e' pp)n reaction at an incident energy of 4.7 GeV over a wide kinematic range. We identified spectator correlated pp and pn nucleon pairs by using kinematic cuts and measured their relative and total momentum distributions. ... ...

Abstract	We have measured the 3He(e,e' pp)n reaction at an incident energy of 4.7 GeV over a wide kinematic range. We identified spectator correlated pp and pn nucleon pairs by using kinematic cuts and measured their relative and total momentum distributions. This is the first measurement of the ratio of pp to pn pairs as a function of pair total momentum p(tot). For pair relative momenta between 0.3 and 0.5 GeV/c, the ratio is very small at low p(tot) and rises to approximately 0.5 at large p(tot). This shows the dominance of tensor over central correlations at this relative momentum.
Language	English
Publishing date	2010-11-26
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.105.222501
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Measurement of the differential cross section for the reaction gamman-->pi- p from deuterium.

Chen, W / Mibe, T / Dutta, D / Gao, H / Laget, J M / Mirazita, M / Rossi, P / Stepanyan, S / Strakovsky, I I / Amaryan, M J / Anghinolfi, M / Bagdasaryan, H / Battaglieri, M / Bellis, M / Berman, B L / Biselli, A S / Bookwalter, C / Branford, D / Briscoe, W J /

Brooks, W K / Burkert, V D / Careccia, S L / Carman, D S / Casey, L / Cole, P L / Collins, P / Crede, V / Daniel, A / Dashyan, N / De Vita, R / De Sanctis, E / Deur, A / Dhamija, S / Dickson, R / Djalali, C / Dodge, G E / Doughty, D / Egiyan, H / Eugenio, P / Fedotov, G / Fradi, A / Garçon, M / Gilfoyle, G P / Giovanetti, K L / Girod, F X / Gohn, W / Gothe, R W / Griffioen, K A / Guidal, M / Hakobyan, H / Hanretty, C / Hassall, N / Heddle, D / Hicks, K / Holtrop, M / Hyde, C E / Ilieva, Y / Ireland, D G / Ishkhanov, B S / Isupov, E L / Jo, H S / Johnstone, J R / Joo, K / Keller, D / Khandaker, M / Khetarpal, P / Kim, W / Klein, A / Klein, F J / Kramer, L H / Kubarovsky, V / Kuhn, S E / Kuleshov, S V / Kuznetsov, V / Livingston, K / Lu, H Y / Markov, N / McCracken, M E / McKinnon, B / Meyer, C A / Mineeva, T / Mokeev, V / Moreno, B / Moriya, K / Nadel-Turonski, P / Nasseripour, R / Niccolai, S / Niculescu, I / Niroula, M R / Osipenko, M / Ostrovidov, A I / Park, K / Park, S / Pereira, S Anefalos / Pogorelko, O / Pozdniakov, S / Price, J W / Procureur, S / Protopopescu, D / Raue, B A / Ricco, G / Ripani, M / Ritchie, B G / Rosner, G / Sabatié, F / Saini, M S / Salamanca, J / Salgado, C / Schumacher, R A / Sharabian, Y G / Sober, D I / Sokhan, D / Stepanyan, S S / Strauch, S / Taiuti, M / Tedeschi, D J / Tkachenko, S / Ungaro, M / Vineyard, M F / Watts, D P / Weinstein, L B / Weygand, D P / Wood, M H / Yegneswaran, A / Zhang, J / Zhao, B

Physical review letters

2009 Volume 103, Issue 1, Page(s) 12301

Abstract: We report a measurement of the differential cross section for the gamman-->pi- p process from the CLAS detector at Jefferson Laboratory in Hall B for photon energies between 1.0 and 3.5 GeV and pion center-of-mass (c.m.) angles (thetac.m.) between 50 ... ...

Abstract	We report a measurement of the differential cross section for the gamman-->pi- p process from the CLAS detector at Jefferson Laboratory in Hall B for photon energies between 1.0 and 3.5 GeV and pion center-of-mass (c.m.) angles (thetac.m.) between 50 degrees and 115 degrees. We confirm a previous indication of a broad enhancement around a c.m. energy ([sqrt]s) of 2.1 GeV at thetac.m.=90 degrees in the scaled differential cross section s7dsigma/dt and a rapid falloff in a center-of-mass energy region of about 400 MeV following the enhancement. Our data show an angular dependence of this enhancement as the suggested scaling region is approached for thetac.m. from 70 degrees to 105 degrees.
Language	English
Publishing date	2009-07-03
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.103.012301
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Bayesian analysis of pentaquark signals from CLAS data.

Ireland, D G / McKinnon, B / Protopopescu, D / Ambrozewicz, P / Anghinolfi, M / Asryan, G / Avakian, H / Bagdasaryan, H / Baillie, N / Ball, J P / Baltzell, N A / Batourine, V / Battaglieri, M / Bedlinskiy, I / Bellis, M / Benmouna, N / Berman, B L / Biselli, A S / Blaszczyk, L /

Bouchigny, S / Boiarinov, S / Bradford, R / Branford, D / Briscoe, W J / Brooks, W K / Burkert, V D / Butuceanu, C / Calarco, J R / Careccia, S L / Carman, D S / Casey, L / Chen, S / Cheng, L / Cole, P L / Collins, P / Coltharp, P / Crabb, D / Crede, V / Dashyan, N / De Masi, R / De Vita, R / De Sanctis, E / Degtyarenko, P V / Deur, A / Dickson, R / Djalali, C / Dodge, G E / Donnelly, J / Doughty, D / Dugger, M / Dzyubak, O P / Egiyan, K S / El Fassi, L / Elouadrhiri, L / Eugenio, P / Fedotov, G / Feldman, G / Fradi, A / Funsten, H / Garçon, M / Gavalian, G / Gevorgyan, N / Gilfoyle, G P / Giovanetti, K L / Girod, F X / Goetz, J T / Gohn, W / Gonenc, A / Gothe, R W / Griffioen, K A / Guidal, M / Guler, N / Guo, L / Gyurjyan, V / Hafidi, K / Hakobyan, H / Hanretty, C / Hassall, N / Hersman, F W / Hleiqawi, I / Holtrop, M / Hyde-Wright, C E / Ilieva, Y / Ishkhanov, B S / Isupov, E L / Jenkins, D / Jo, H S / Johnstone, J R / Joo, K / Juengst, H G / Kalantarians, N / Kellie, J D / Khandaker, M / Kim, W / Klein, A / Klein, F J / Kossov, M / Krahn, Z / Kramer, L H / Kubarovsky, V / Kuhn, J / Kuleshov, S V / Kuznetsov, V / Lachniet, J / Laget, J M / Langheinrich, J / Lawrence, D / Livingston, K / Lu, H Y / Maccormick, M / Markov, N / Mattione, P / Mecking, B A / Mestayer, M D / Meyer, C A / Mibe, T / Mikhailov, K / Mirazita, M / Miskimen, R / Mokeev, V / Moreno, B / Moriya, K / Morrow, S A / Moteabbed, M / Munevar, E / Mutchler, G S / Nadel-Turonski, P / Nasseripour, R / Niccolai, S / Niculescu, G / Niculescu, I / Niczyporuk, B B / Niroula, M R / Niyazov, R A / Nozar, M / Osipenko, M / Ostrovidov, A I / Park, K / Pasyuk, E / Paterson, C / Pereira, S Anefalos / Pierce, J / Pivnyuk, N / Pogorelko, O / Pozdniakov, S / Price, J W / Procureur, S / Prok, Y / Raue, B A / Ricco, G / Ripani, M / Ritchie, B G / Ronchetti, F / Rosner, G / Rossi, P / Sabatié, F / Salamanca, J / Salgado, C / Santoro, J P / Sapunenko, V / Schumacher, R A / Serov, V S / Sharabian, Y G / Sharov, D / Shvedunov, N V / Smith, L C / Sober, D I / Sokhan, D / Stavinsky, A / Stepanyan, S S / Stepanyan, S / Stokes, B E / Stoler, P / Strauch, S / Taiuti, M / Tedeschi, D J / Tkabladze, A / Tkachenko, S / Tur, C / Ungaro, M / Vineyard, M F / Vlassov, A V / Watts, D P / Weinstein, L B / Weygand, D P / Williams, M / Wolin, E / Wood, M H / Yegneswaran, A / Zana, L / Zhang, J / Zhao, B / Zhao, Z W

Physical review letters

2008 Volume 100, Issue 5, Page(s) 52001

Abstract: We examine the results of two measurements by the CLAS collaboration, one of which claimed evidence for a Theta(+) pentaquark, while the other found no such evidence. The unique feature of these two experiments was that they were performed with the same ... ...

Abstract	We examine the results of two measurements by the CLAS collaboration, one of which claimed evidence for a Theta(+) pentaquark, while the other found no such evidence. The unique feature of these two experiments was that they were performed with the same experimental setup. Using a Bayesian analysis, we find that the results of the two experiments are in fact compatible with each other, but that the first measurement did not contain sufficient information to determine unambiguously the existence of a Theta(+). Further, we suggest a means by which the existence of a new candidate particle can be tested in a rigorous manner.
Language	English
Publishing date	2008-02-08
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.100.052001
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Measurement of deeply virtual compton scattering beam-spin asymmetries.

Girod, F X / Niyazov, R A / Avakian, H / Ball, J / Bedlinskiy, I / Burkert, V D / De Masi, R / Elouadrhiri, L / Garçon, M / Guidal, M / Jo, H S / Joo, K / Kubarovsky, V / Kuleshov, S V / MacCormick, M / Niccolai, S / Pogorelko, O / Sabatié, F / Stepanyan, S /

Stoler, P / Ungaro, M / Zhao, B / Amaryan, M J / Ambrozewicz, P / Anghinolfi, M / Asryan, G / Bagdasaryan, H / Baillie, N / Ball, J P / Baltzell, N A / Batourine, V / Battaglieri, M / Bellis, M / Benmouna, N / Berman, B L / Biselli, A S / Blaszczyk, L / Bouchigny, S / Boiarinov, S / Bradford, R / Branford, D / Briscoe, W J / Brooks, W K / Bültmann, S / Butuceanu, C / Calarco, J R / Careccia, S L / Carman, D S / Casey, L / Chen, S / Cheng, L / Cole, P L / Collins, P / Coltharp, P / Crabb, D / Crede, V / Dashyan, N / De Sanctis, E / De Vita, R / Degtyarenko, P V / Deur, A / Dharmawardane, K V / Dickson, R / Djalali, C / Dodge, G E / Donnelly, J / Doughty, D / Dugger, M / Dzyubak, O P / Egiyan, H / Egiyan, K S / El Fassi, L / Eugenio, P / Fedotov, G / Feldman, G / Funsten, H / Gavalian, G / Gilfoyle, G P / Giovanetti, K L / Goetz, J T / Gonenc, A / Gothe, R W / Griffioen, K A / Guler, N / Guo, L / Gyurjyan, V / Hafidi, K / Hakobyan, H / Hanretty, C / Hersman, F W / Hicks, K / Hleiqawi, I / Holtrop, M / Hyde, C E / Ilieva, Y / Ireland, D G / Ishkhanov, B S / Isupov, E L / Ito, M M / Jenkins, D / Johnstone, J R / Juengst, H G / Kalantarians, N / Kellie, J D / Khandaker, M / Kim, W / Klein, A / Klein, F J / Klimenko, A V / Kossov, M / Krahn, Z / Kramer, L H / Kuhn, J / Kuhn, S E / Lachniet, J / Laget, J M / Langheinrich, J / Lawrence, D / Lee, T / Livingston, K / Lu, H Y / Markov, N / Mattione, P / Mazouz, M / McKinnon, B / Mecking, B A / Mestayer, M D / Meyer, C A / Mibe, T / Michel, B / Mikhailov, K / Mirazita, M / Miskimen, R / Mokeev, V / Moriya, K / Morrow, S A / Moteabbed, M / Munevar, E / Mutchler, G S / Nadel-Turonski, P / Nasseripour, R / Niculescu, G / Niculescu, I / Niczyporuk, B B / Niroula, M R / Nozar, M / Osipenko, M / Ostrovidov, A I / Park, K / Pasyuk, E / Paterson, C / Anefalos Pereira, S / Pierce, J / Pivnyuk, N / Pocanic, D / Pozdniakov, S / Price, J W / Procureur, S / Prok, Y / Protopopescu, D / Raue, B A / Ricco, G / Ripani, M / Ritchie, B G / Rosner, G / Rossi, P / Salamanca, J / Salgado, C / Santoro, J P / Sapunenko, V / Schumacher, R A / Serov, V S / Sharabian, Y G / Sharov, D / Shvedunov, N V / Smith, E S / Smith, L C / Sober, D I / Sokhan, D / Stavinsky, A / Stepanyan, S S / Stokes, B E / Strakovsky, I I / Strauch, S / Taiuti, M / Tedeschi, D J / Tkabladze, A / Tkachenko, S / Tur, C / Vineyard, M F / Vlassov, A V / Voutier, E / Watts, D P / Weinstein, L B / Weygand, D P / Williams, M / Wolin, E / Wood, M H / Yegneswaran, A / Zana, L / Zhang, J / Zhao, Z W

Physical review letters

2008 Volume 100, Issue 16, Page(s) 162002

Abstract: The beam-spin asymmetries in the hard exclusive electroproduction of photons on the proton (e p-->epgamma) were measured over a wide kinematic range and with high statistical accuracy. These asymmetries result from the interference of the Bethe-Heitler ... ...

Abstract	The beam-spin asymmetries in the hard exclusive electroproduction of photons on the proton (e p-->epgamma) were measured over a wide kinematic range and with high statistical accuracy. These asymmetries result from the interference of the Bethe-Heitler process and of deeply virtual Compton scattering. Over the whole kinematic range (x(B) from 0.11 to 0.58, Q2 from 1 to 4.8 GeV2, -t from 0.09 to 1.8 GeV2), the azimuthal dependence of the asymmetries is compatible with expectations from leading-twist dominance, A approximately a sinphi/(1+c cosphi). This extensive set of data can thus be used to constrain significantly the generalized parton distributions of the nucleon in the valence quark sector.
Language	English
Publishing date	2008-04-25
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.100.162002
Database	MEDical Literature Analysis and Retrieval System OnLINE

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