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  • Fraction of χ_{c} Decays in Prompt J/ψ Production Measured in pPb Collisions at sqrt[s_{NN}]=8.16  TeV
    Agapopoulou, C; Aidala, C A; Andreola, P; Anelli, A A; Bailly-Reyre, A; Barbosa, I R; Battig, A; Bay, A; Benane, G; Bertella, C; Bertolin, A; Bieker, M S; Buonincontri, L; Butter, J S; Calvi, M; Chernyshenko, S; Chobanova, V; Clemencic, M; Cogneras, E; Couturier, B; Da Silva, C L; Danilina, A; Debernardis, F; Del Buono, L; Denysenko, V; Dolmatov, A; Dos Reis, A C; Dudek, M W; Escher, S; Fleuret, F; Gabriel, E; Garcia Moreno, P; Gibson, V; Gong, G; Graziani, G; Guarise, M; Guittiere, M; Haimberger, J; Halewood-Leagas, T; Halvorsen, M M; Hennequin, A M; Ilten, P; Jakobsen, S; Jost, B; Karpenkov, D; Ketel, T; Kirsebom, V S; Kucharczyk, M; Lacarrere, D; Langer, J; Lantwin, O; Legotin, S; Lesiak, T; Leverington, B; Li, Z; Liang, X; Lin, C; Lin, T; Liu, Y; Luppi, E; Madurai, M M; Maevskiy, A; Maisuzenko, D; Meadows, B; Melnychuk, D; Mitzel, D S; Muhammad, E; Murta, R; Owen, P; Ozcelik, O; Patel, M; Petridis, K; Polycarpo, E; Rademacker, J H; Rama, M; Ren, Z; Ricart, G R; Saranin, D; Savrina, D; Sciuccati, A; Shchutska, L; Shmanin, E; Simi, G; Skuza, R; Solovev, A; Souza De Almeida, F L; Sriskaran, V; Suljik, F; Sun, L; Tomassetti, L; Uecker, L H; Van Laak, R; Vázquez Sierra, C; Vieira, D; Wang, N W; Xie, Y; Yang, X; Zheng, Y; Zhou, Y; Zhukov, V

    Physical review letters, 2024-Mar-08, 20240308, Letnik: 132, Številka: 10
    Journal Article

    The fraction of χ_{c1} and χ_{c2} decays in the prompt J/ψ yield, F_{χ_{c}→J/ψ}=σ_{χ_{c}→J/ψ}/σ_{J/ψ}, is measured by the LHCb detector in pPb collisions at sqrts_{NN}=8.16  TeV. The study covers the forward (1.5<y^{*}<4.0) and backward (-5.0<y^{*}<-2.5) rapidity regions, where y^{*} is the J/ψ rapidity in the nucleon-nucleon center-of-mass system. Forward and backward rapidity samples correspond to integrated luminosities of 13.6±0.3 and 20.8±0.5  nb^{-1}, respectively. The result is presented as a function of the J/ψ transverse momentum p_{T,J/ψ} in the range 1<p_{T,J/ψ}<20  GeV/c. The F_{χ_{c}→J/ψ} fraction at forward rapidity is compatible with the LHCb measurement performed in pp collisions at sqrts=7  TeV, whereas the result at backward rapidity is 2.4σ larger than in the forward region for 1<p_{T,J/ψ}<3  GeV/c. The increase of F_{χ_{c}→J/ψ} at low p_{T,J/ψ} at backward rapidity is compatible with the suppression of the ψ(2S) contribution to the prompt J/ψ yield. The lack of in-medium dissociation of χ_{c} states observed in this study sets an upper limit of 180 MeV on the free energy available in these pPb collisions to dissociate or inhibit charmonium state formation.

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