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First Measurement of Near-Threshold J/ψ Exclusive Photoproduction off the Proton.
Ali, A; Amaryan, M; Anassontzis, E G; Austregesilo, A; Baalouch, M; Barbosa, F; Barlow, J; Barnes, A; Barriga, E; Beattie, T D; Berdnikov, V V; Black, T; Boeglin, W; Boer, M; Briscoe, W J; Britton, T; Brooks, W K; Cannon, B E; Cao, N; Chudakov, E; Cole, S; Cortes, O; Crede, V; Dalton, M M; Daniels, T; Deur, A; Dobbs, S; Dolgolenko, A; Dotel, R; Dugger, M; Dzhygadlo, R; Egiyan, H; Ernst, A; Eugenio, P; Fanelli, C; Fegan, S; Foda, A M; Foote, J; Frye, J; Furletov, S; Gan, L; Gasparian, A; Gauzshtein, V; Gevorgyan, N; Gleason, C; Goetzen, K; Goncalves, A; Goryachev, V S; Guo, L; Hakobyan, H.
Afiliação
  • Ali A; GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany.
  • Amaryan M; Old Dominion University, Norfolk, Virginia 23529, USA.
  • Anassontzis EG; National and Kapodistrian University of Athens, 15771 Athens, Greece.
  • Austregesilo A; Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
  • Baalouch M; Old Dominion University, Norfolk, Virginia 23529, USA.
  • Barbosa F; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Barlow J; Florida State University, Tallahassee, Florida 32306, USA.
  • Barnes A; Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
  • Barriga E; Florida State University, Tallahassee, Florida 32306, USA.
  • Beattie TD; University of Regina, Regina, Saskatchewan, Canada S4S 0A2.
  • Berdnikov VV; National Research Nuclear University Moscow Engineering Physics Institute, Moscow 115409, Russia.
  • Black T; University of North Carolina at Wilmington, Wilmington, North Carolina 28403, USA.
  • Boeglin W; Florida International University, Miami, Florida 33199, USA.
  • Boer M; The Catholic University of America, Washington, D.C. 20064, USA.
  • Briscoe WJ; The George Washington University, Washington, D.C. 20052, USA.
  • Britton T; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Brooks WK; Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile.
  • Cannon BE; Florida State University, Tallahassee, Florida 32306, USA.
  • Cao N; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Chudakov E; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Cole S; Arizona State University, Tempe, Arizona 85287, USA.
  • Cortes O; The George Washington University, Washington, D.C. 20052, USA.
  • Crede V; Florida State University, Tallahassee, Florida 32306, USA.
  • Dalton MM; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Daniels T; University of North Carolina at Wilmington, Wilmington, North Carolina 28403, USA.
  • Deur A; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Dobbs S; Florida State University, Tallahassee, Florida 32306, USA.
  • Dolgolenko A; National Research Centre Kurchatov Institute, Institute for Theoretical and Experimental Physics, Moscow 117259, Russia.
  • Dotel R; Florida International University, Miami, Florida 33199, USA.
  • Dugger M; Arizona State University, Tempe, Arizona 85287, USA.
  • Dzhygadlo R; GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany.
  • Egiyan H; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Ernst A; Florida State University, Tallahassee, Florida 32306, USA.
  • Eugenio P; Florida State University, Tallahassee, Florida 32306, USA.
  • Fanelli C; Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
  • Fegan S; The George Washington University, Washington, D.C. 20052, USA.
  • Foda AM; University of Regina, Regina, Saskatchewan, Canada S4S 0A2.
  • Foote J; Indiana University, Bloomington, Indiana 47405, USA.
  • Frye J; Indiana University, Bloomington, Indiana 47405, USA.
  • Furletov S; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Gan L; University of North Carolina at Wilmington, Wilmington, North Carolina 28403, USA.
  • Gasparian A; North Carolina A&T State University, Greensboro, North Carolina 27411, USA.
  • Gauzshtein V; Tomsk State University, 634050 Tomsk, Russia.
  • Gevorgyan N; Tomsk Polytechnic University, 634050 Tomsk, Russia.
  • Gleason C; A.I. Alikhanian National Science Laboratory (Yerevan Physics Institute), 0036 Yerevan, Armenia.
  • Goetzen K; Indiana University, Bloomington, Indiana 47405, USA.
  • Goncalves A; GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany.
  • Goryachev VS; Florida State University, Tallahassee, Florida 32306, USA.
  • Guo L; National Research Centre Kurchatov Institute, Institute for Theoretical and Experimental Physics, Moscow 117259, Russia.
  • Hakobyan H; Florida International University, Miami, Florida 33199, USA.
Phys Rev Lett ; 123(7): 072001, 2019 Aug 16.
Article em En | MEDLINE | ID: mdl-31491124
ABSTRACT
We report on the measurement of the γp→J/ψp cross section from E_{γ}=11.8 GeV down to the threshold at 8.2 GeV using a tagged photon beam with the GlueX experiment. We find that the total cross section falls toward the threshold less steeply than expected from two-gluon exchange models. The differential cross section dσ/dt has an exponential slope of 1.67±0.39 GeV^{-2} at 10.7 GeV average energy. The LHCb pentaquark candidates P_{c}^{+} can be produced in the s channel of this reaction. We see no evidence for them and set model-dependent upper limits on their branching fractions B(P_{c}^{+}→J/ψp) and cross sections σ(γp→P_{c}^{+})×B(P_{c}^{+}→J/ψp).
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Alemanha
Texto completo
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Alemanha