First Measurement of Near-Threshold J /ψ Exclusive Photoproduction off the Proton

Επιστημονική δημοσίευση - Άρθρο Περιοδικού uoadl:3071967 47 Αναγνώσεις

Μονάδα:
Ερευνητικό υλικό ΕΚΠΑ
Τίτλος:
First Measurement of Near-Threshold J /ψ Exclusive Photoproduction off the Proton
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
We report on the measurement of the γp→J/ψp cross section from Eγ=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 Pc+ 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(Pc+→J/ψp) and cross sections σ(γp→Pc+)×B(Pc+→J/ψp). © 2019 American Physical Society.
Έτος δημοσίευσης:
2019
Συγγραφείς:
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.
Hamdi, A.
Han, S.
Hardin, J.
Huber, G.M.
Hurley, A.
Ireland, D.G.
Ito, M.M.
Jarvis, N.S.
Jones, R.T.
Kakoyan, V.
Kalicy, G.
Kamel, M.
Kourkoumelis, C.
Kuleshov, S.
Kuznetsov, I.
Larin, I.
Lawrence, D.
Lersch, D.I.
Li, H.
Li, W.
Liu, B.
Livingston, K.
Lolos, G.J.
Lyubovitskij, V.
Mack, D.
Marukyan, H.
Matveev, V.
McCaughan, M.
McCracken, M.
McGinley, W.
McIntyre, J.
Meyer, C.A.
Miskimen, R.
Mitchell, R.E.
Mokaya, F.
Nerling, F.
Ng, L.
Ostrovidov, A.I.
Papandreou, Z.
Patsyuk, M.
Pauli, P.
Pedroni, R.
Pentchev, L.
Peters, K.J.
Phelps, W.
Pooser, E.
Qin, N.
Reinhold, J.
Ritchie, B.G.
Robison, L.
Romanov, D.
Romero, C.
Salgado, C.
Schertz, A.M.
Schumacher, R.A.
Schwiening, J.
Seth, K.K.
Shen, X.
Shepherd, M.R.
Smith, E.S.
Sober, D.I.
Somov, A.
Somov, S.
Soto, O.
Stevens, J.R.
Strakovsky, I.I.
Suresh, K.
Tarasov, V.
Taylor, S.
Teymurazyan, A.
Thiel, A.
Vasileiadis, G.
Werthmüller, D.
Whitlatch, T.
Wickramaarachchi, N.
Williams, M.
Xiao, T.
Yang, Y.
Zarling, J.
Zhang, Z.
Zhao, G.
Zhou, Q.
Zhou, X.
Zihlmann, B.
GlueX Collaboration
Περιοδικό:
Physical Review and Physical Review Letters Index
Εκδότης:
American Physical Society
Τόμος:
123
Αριθμός / τεύχος:
7
Λέξεις-κλειδιά:
Germanium compounds, Average energy; Branching fractions; Differential cross section; Exchange models; Near thresholds; Photoproductions; Tagged photon beams; Upper limits, Boron compounds
Επίσημο URL (Εκδότης):
DOI:
10.1103/PhysRevLett.123.072001
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