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Exclusive J/ψ Photoproduction off Protons in Ultraperipheral p-Pb Collisions at sqrt[s_{NN}]=5.02 TeV.

Abelev, B; Adam, J; Adamová, D; Aggarwal, M M; Aglieri Rinella, G; Agnello, M; Agostinelli, A; Agrawal, N; Ahammed, Z and Ahmad, N, et al. (2014) In Physical Review Letters 113(23).
Abstract
We present the first measurement at the LHC of exclusive J/ψ photoproduction off protons, in ultraperipheral proton-lead collisions at sqrt[s_{NN}]=5.02 TeV. Events are selected with a dimuon pair produced either in the rapidity interval, in the laboratory frame, 2.5<y<4 (p-Pb) or -3.6<y<-2.6 (Pb-p), and no other particles observed in the ALICE acceptance. The measured cross sections σ(γ+p→J/ψ+p) are 33.2±2.2(stat)±3.2(syst)±0.7(theor) nb in p-Pb and 284±36(stat)_{-32}^{+27}(syst)±26(theor) nb in Pb-p collisions. We measure this process up to about 700 GeV in the γp center of mass, which is a factor of two larger than the highest energy studied at HERA. The data are consistent with a power law dependence of the J/ψ... (More)
We present the first measurement at the LHC of exclusive J/ψ photoproduction off protons, in ultraperipheral proton-lead collisions at sqrt[s_{NN}]=5.02 TeV. Events are selected with a dimuon pair produced either in the rapidity interval, in the laboratory frame, 2.5<y<4 (p-Pb) or -3.6<y<-2.6 (Pb-p), and no other particles observed in the ALICE acceptance. The measured cross sections σ(γ+p→J/ψ+p) are 33.2±2.2(stat)±3.2(syst)±0.7(theor) nb in p-Pb and 284±36(stat)_{-32}^{+27}(syst)±26(theor) nb in Pb-p collisions. We measure this process up to about 700 GeV in the γp center of mass, which is a factor of two larger than the highest energy studied at HERA. The data are consistent with a power law dependence of the J/ψ photoproduction cross section in γp energies from about 20 to 700 GeV, or equivalently, from Bjorken x scaling variable between ∼2×10^{-2} and ∼2×10^{-5}, thus indicating no significant change in the gluon density behavior of the proton between HERA and LHC energies. (Less)
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Physical Review Letters
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113
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23
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1079-7114
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10.1103/PhysRevLett.113.232504
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English
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@article{ba249beb-d3e3-4fa1-bec3-66ccd46e8f28,
  abstract     = {We present the first measurement at the LHC of exclusive J/ψ photoproduction off protons, in ultraperipheral proton-lead collisions at sqrt[s_{NN}]=5.02 TeV. Events are selected with a dimuon pair produced either in the rapidity interval, in the laboratory frame, 2.5&lt;y&lt;4 (p-Pb) or -3.6&lt;y&lt;-2.6 (Pb-p), and no other particles observed in the ALICE acceptance. The measured cross sections σ(γ+p→J/ψ+p) are 33.2±2.2(stat)±3.2(syst)±0.7(theor) nb in p-Pb and 284±36(stat)_{-32}^{+27}(syst)±26(theor) nb in Pb-p collisions. We measure this process up to about 700 GeV in the γp center of mass, which is a factor of two larger than the highest energy studied at HERA. The data are consistent with a power law dependence of the J/ψ photoproduction cross section in γp energies from about 20 to 700 GeV, or equivalently, from Bjorken x scaling variable between ∼2×10^{-2} and ∼2×10^{-5}, thus indicating no significant change in the gluon density behavior of the proton between HERA and LHC energies.},
  articleno    = {232504},
  author       = {Abelev, B and Adam, J and Adamová, D and Aggarwal, M M and Aglieri Rinella, G and Agnello, M and Agostinelli, A and Agrawal, N and Ahammed, Z and Ahmad, N and Ahmed, I and Ahn, S U and Ahn, S A and Aimo, I and Aiola, S and Ajaz, M and Akindinov, A and Alam, S N and Aleksandrov, D and Alessandro, B and Alexandre, D and Alici, A and Alkin, A and Alme, J and Alt, T and Altinpinar, S and Altsybeev, I and Alves Garcia Prado, C and Andrei, C and Andronic, A and Anguelov, V and Anielski, J and Antičić, T and Antinori, F and Antonioli, P and Aphecetche, L and Appelshäuser, H and Arcelli, S and Armesto, N and Arnaldi, R and Aronsson, T and Arsene, I C and Arslandok, M and Augustinus, A and Averbeck, R and Awes, T C and Azmi, M D and Bach, M and Badalà, A and Baek, Y W and Bagnasco, S and Bailhache, R and Bala, R and Baldisseri, A and Baltasar Dos Santos Pedrosa, F and Baral, R C and Barbera, R and Barile, F and Barnaföldi, G G and Barnby, L S and Barret, V and Bartke, J and 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K and Schweda, K and Scioli, G and Scomparin, E and Scott, R and Segato, G and Seger, J E and Sekiguchi, Y and Selyuzhenkov, I and Seo, J and Serradilla, E and Sevcenco, A and Shabetai, A and Shabratova, G and Shahoyan, R and Shangaraev, A and Sharma, N and Sharma, S and Shigaki, K and Shtejer, K and Sibiriak, Y and Siddhanta, S and Siemiarczuk, T and Silvermyr, D and Silvestre, C and Simatovic, G and Singaraju, R and Singh, R and Singha, S and Singhal, V and Sinha, B C and Sinha, T and Sitar, B and Sitta, M and Skaali, T B and Skjerdal, K and Slupecki, M and Smirnov, N and Snellings, R J M and Sogaard, Carsten and Soltz, R and Song, J and Song, M and Soramel, F and Sorensen, S and Spacek, M and Spiriti, E and Sputowska, I and Spyropoulou-Stassinaki, M and Srivastava, B K and Stachel, J and Stan, I and Stefanek, G and Steinpreis, M and Stenlund, Evert and Steyn, G and Stiller, J H and Stocco, D and Stolpovskiy, M and Strmen, P and Suaide, A A P and Sugitate, T and Suire, C and Suleymanov, M and Sultanov, R and Šumbera, M and Susa, T and Symons, T J M and Szabo, A and Szanto de Toledo, A and Szarka, I and Szczepankiewicz, A and Szymanski, M and Takahashi, J and Tangaro, M A and Tapia Takaki, J D and Tarantola Peloni, A and Tarazona Martinez, A and Tarzila, M G and Tauro, A and Tejeda Muñoz, G and Telesca, A and Terrevoli, C and Thäder, J and Thomas, D and Tieulent, R and Timmins, A R and Toia, A and Trubnikov, V and Trzaska, W H and Tsuji, T and Tumkin, A and Turrisi, R and Tveter, T S and Ullaland, K and Uras, A and Usai, G L and Vajzer, M and Vala, M and Valencia Palomo, L and Vallero, S and Vande Vyvre, P and Van Der Maarel, J and Van Hoorne, J W and van Leeuwen, M and Vargas, A and Vargyas, M and Varma, R and Vasileiou, M and Vasiliev, A and Vechernin, V and Veldhoen, M and Velure, A and Venaruzzo, M and Vercellin, E and Vergara Limón, S and Vernet, R and Verweij, M and Vickovic, L and Viesti, G and Viinikainen, J and Vilakazi, Z and Villalobos Baillie, O 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A and Zimmermann, A and Zimmermann, M B and Zinovjev, G and Zoccarato, Y and Zyzak, M},
  issn         = {1079-7114},
  language     = {eng},
  number       = {23},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Exclusive J/ψ Photoproduction off Protons in Ultraperipheral p-Pb Collisions at sqrt[s_{NN}]=5.02 TeV.},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.113.232504},
  volume       = {113},
  year         = {2014},
}