Measurement of exclusive \[{{{\uprho _{}^{}} _{}^{}}{{\left( {770}\right) }{}_{}^{}}} ^{0}\] photoproduction in ultraperipheral pPb collisions at \[\sqrt{\smash [b]{s_{_{\mathrm {NN}}}}} = 5.02\,\text {Te}\text {V} \]

• Autor: N Van Remortel ; S Abu Zeid ; Magitteri, A ; Calligaris, L ; Nguyen, M ; Ochando, C ; Sordini, V ; Ghosh, S ; Künsken, A ; Martin, M Aldaya ; Singh, A ; Turkot, O ; Lange, J ; Schumann, S ; Colombo, F ; Heindl, S M ; Wayand, S ; Evangelou, I ; Strologas, J ; Hajdu, C ; Ujvari, B ; Swain, S K ; Bharti, M ; S Roy Chowdhury ; Felcini, M ; Calabria, C ; Gelmi, A ; Ferro, F ; Boletti, A ; Mantovani, G ; Fedi, G ; Giassi, A ; Pandolfi, F ; Bartosik, N ; Yang, Y C ; Roh, Y ; Pineda, A Morelos ; Shah, M A ; Szleper, M ; Lychkovskaya, N ; Spiridonov, A ; Petrushanko, S ; Volkov, A ; Vischia, P ; Fernandez, M ; Barney, D ; Dabrowski, A ; T du Pree ; Franzoni, G ; Janot, P ; Sakulin, H ; Kotlinski, D ; Pata, J ; Schönenberger, M ; Chang, P ; Heath, H F ; Stoye, M ; Buccilli, A ; Henderson, C ; Gastler, D ; Shalhout, S ; Dasgupta, A ; Cittolin, S ; Holzner, A ; Incandela, J ; Wilkinson, R ; Johnson, A ; Quach, D ; Bauerdick, L A T ; Cheung, H W K ; Z Hu ; Kortelainen, M J ; Kreis, B ; Mason, D ; Taylor, L ; Weber, H A ; Gleyzer, S V ; Penzo, A ; Snyder, C ; Wetzel, J ; Swartz, M ; Khalil, S ; Modak, A ; Kunkle, J ; Teixeira De Lima, R ; Winer, B L ; Lucchini, M T ; Jones, M ; Khatiwada, A ; Mahakud, B ; Wang, F ; Demina, R ; Rose, K ; Perloff, A ; Kunori, S ; Peltola, T ; Cox, B ; Wolfe, E ; Karchin, P E ; Smith, N
• Assuntos: Collisions ; Cross-sections ; Dependence ; Momentum transfer ; Photons ; Photoproduction ; Protons
• É parte de: The European physical journal. C, Particles and fields, 2019-08, Vol.79 (8), p.1-27
• Descrição: Exclusive \[{{{\uprho _{}^{}} _{}^{}}{{\left( {770}\right) }{}_{}^{}}} ^{0}\] photoproduction is measured for the first time in ultraperipheral pPb collisions at \[\sqrt{\smash [b]{s_{_{\mathrm {NN}}} = 5.02\,\text {Te}\text {V} \] with the CMS detector. The cross section \[\sigma ({\upgamma _{}^{}} \mathrm{p}\rightarrow {{{\uprho _{}^{}} _{}^{}}{{\left( {770}\right) }{}_{}^{}}} ^{0}\mathrm{p})\] is \[11.0 \pm 1.4\,\text {(stat)} \pm 1.0\,\text {(syst)} \]\[\mu \]b at \[\langle W_{{\upgamma _{}^{}} \mathrm{p}}\rangle = 92.6\,\text {Ge}\text {V} \] for photon–proton centre-of-mass energies \[W_{{\upgamma _{}^{}} \mathrm{p}}\] between 29 and \[213\,\text {Ge}\text {V} \]. The differential cross section \[\mathrm {d}\sigma /\mathrm {d}|t |\] is measured in the interval \[0.025< |t | < 1\,\text {Ge}\text {V} ^{2}\] as a function of \[W_{{\upgamma _{}^{}} \mathrm{p}}\], where t is the squared four-momentum transfer at the proton vertex. The results are compared with previous measurements and theoretical predictions. The measured cross section \[\sigma ({\upgamma _{}^{}} \mathrm{p}\rightarrow {{{\uprho _{}^{}} _{}^{}}{{\left( {770}\right) }{}_{}^{}}} ^{0}\mathrm{p})\] has a power-law dependence on the photon–proton centre-of-mass, consistent with electron–proton collision measurements performed at HERA. The \[W_{{\upgamma _{}^{}} \mathrm{p}}\] dependence of the exponential slope of the differential cross section \[\mathrm {d}\sigma /\mathrm {d}|t |\] is also measured.
  
• Editor: Heidelberg: Springer Nature B.V
  
• Idioma: Inglês