Coherent J/psi and psi ' photoproduction at midrapidity in ultra-peripheral Pb-Pb collisions at root s(NN)=5.02 TeV
Articolo
Data di Pubblicazione:
2021
Abstract:
The coherent photoproduction of J/psi and psi' mesons was measured in ultra-peripheral Pb-Pb collisions at a center-of-mass energy root s(NN) = 5.02 TeV with the ALICE detector. Charmonia are detected in the central rapidity region for events where the hadronic interactions are strongly suppressed. The J/psi is reconstructed using the dilepton (l(+)l(-)) and proton-antiproton decay channels, while for the psi' the dilepton and the l(+)l(-) pi(+)pi(-) decay channels are studied. The analysis is based on an event sample corresponding to an integrated luminosity of about 233 mu b(-1). The results are compared with theoretical models for coherent J/psi and psi' photoproduction. The coherent cross section is found to be in a good agreement with models incorporating moderate nuclear gluon shadowing of about 0.64 at a Bjorken-x of around 6 x 10(-4), such as the EPS09 parametrization, however none of the models is able to fully describe the rapidity dependence of the coherent J/psi cross section including ALICE measurements at forward rapidity. The ratio of psi' to J/psi coherent photoproduction cross sections was also measured and found to be consistent with the one for photoproduction off protons.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
Acharya, S; Adamova, D; Adler, A; Adolfsson, J; Rinella, GA; Agnello, M; Agrawal, N; Ahammed, Z; Ahmad, S; Ahn, SU; Akbar, Z; Akindinov, A; Al-Turany, M; Albuquerque, DSD; Aleksandrov, D; Alessandro, B; Alfanda, HM; Molina, RA; Ali, B; Ali, Y; Alici, A; Alizadehvandchali, N; Alkin, A; Alme, J; Alt, T; Altenkamper, L; Altsybeev, I; Anaam, MN; Andrei, C; Andreou, D; Andronic, A; Anguelov, V; Antinori, F; Antonioli, P; Anuj, C; Apadula, N; Aphecetche, L; Appelshauser, H; Arcelli, S; Arnaldi, R; Arratia, M; Arsene, IC; Arslandok, M; Augustinus, A; Averbeck, R; Aziz, S; Azmi, MD; Badala, A; Baek, YW; Bai, X; Bailhache, R; Bala, R; Balbino, A; Baldisseri, A; Ball, M; Banerjee, D; Barbera, R; Barioglio, L; Barlou, M; Barnafoldi, GG; Barnby, LS; Barret, V; Bartels, C; Barth, K; Bartsch, E; Baruffaldi, F; Bastid, N; Basu, S; Batigne, G; Batyunya, B; Bauri, D; Alba, JLB; Bearden, IG; Beattie, C; Belikov, I; Hechavarria, ADCB; Bellini, F; Bellwied, R; Belokurova, S; Belyaev, V; Bencedi, G; Beole, S; Bercuci, A; Berdnikov, Y; Berdnikova, A; Berenyi, D; Bergmann, L; Besoiu, MG; Betev, L; Bhaduri, PP; Bhasin, A; Bhat, IR; Bhat, MA; Bhattacharjee, B; Bhattacharya, P; Bianchi, A; Bianchi, L; Bianchi, N; Bielcik, J; Bielcikova, J; Bilandzic, A; Biro, G; Biswas, S; Blair, JT; Blau, D; Blidaru, MB; Blume, C; Boca, G; Bock, F; Bogdanov, A; Boi, S; Bok, J; Boldizsar, L; Bolozdynya, A; Bombara, M; Bond, PM; Bonomi, G; Borel, H; Borissov, A; Bossi, H; Botta, E; Bratrud, L; Braun-Munzinger, P; Bregant, M; Broz, M; Bruno, GE; Buckland, MD; Budnikov, D; Buesching, H; Bufalino, S; Bugnon, O; Buhler, P; Buncic, P; Buthelezi, Z; Butt, JB; Bysiak, SA; Caffarri, D; Cai, M; Caliva, A; Villar, EC; Camacho, JMM; Camacho, RS; Camerini, P; Canedo, FDM; Capon, AA; Carnesecchi, F; Caron, R; Castellanos, JC; Casula, EAR; Catalano, F; Sanchez, CC; Chakraborty, P; Chandra, S; Chang, W; Chapeland, S; Chartier, M; Chattopadhyay, S; Chattopadhyay, S; Chauvin, A; Chavez, TG; Cheshkov, C; Cheynis, B; Barroso, VC; Chinellato, DD; Cho, S; Chochula, P; Christakoglou, P; Christensen, CH; Christiansen, P; Chujo, T; Cicalo, C; Cifarelli, L; Cindolo, F; Ciupek, MR; Clai, G; Cleymans, J; Colburn, JS; Colella, D; Collu, A; Colocci, M; Concas, M; Balbastre, GC; del Valle, ZC; Contin, G; Contreras, JG; Cormier, TM; Cortese, P; Cosentino, MR; Costa, F; Costanza, S; Crochet, P; Cuautle, E; Cui, P; Cunqueiro, L; Dainese, A; Damas, FPA; Danisch, MC; Danu, A; Das, I; Das, P; Das, P; Das, S; Dash, S; De, S; DeCaro, A; de Cataldo, G; De Cilladi, L; de Cuveland, J; De Falco, A; De Gruttola, D; De Marco, N; De Martin, C; De Pasquale, S; Deb, S; Degenhardt, HF; Deja, KR; Dello Stritto, L; Delsanto, S; Deng, W; Dhankher, P; DiBari, D; Di Mauro, A; Diaz, RA; Dietel, T; Ding, Y; Divia, R; Dixit, DU; Djuvsland, O; Dmitrieva, U; Do, J; Dobrin, A; Donigus, B; Dordic, O; Dubey, AK; Dubla, A; Dudi, S; Dukhishyam, M; Dupieux, P; Eder, TM; Ehlers, RJ; Eikeland, VN; Elia, D; Erazmus, B; Ercolessi, F; Erhardt, F; Erokhin, A; Ersdal, MR; Espagnon, B; Eulisse, G; Evans, D; Evdokimov, S; Fabbietti, L; Faggin, M; Faivre, J; Fan, F; Fantoni, A; Fasel, M; Fecchio, P; Feliciello, A; Feofilov, G; Tellez, AF; Ferrero, A; Ferretti, A; Festanti, A; Feuillard, VJG; Figiel, J; Filchagin, S; Finogeev, D; Fionda, FM; Fiorenza, G; Flor, F; Flores, AN; Foertsch, S; Foka, P; Fokin, S; Fragiacomo, E; Fuchs, U; Funicello, N; Furget, C; Furs, A; Girard, MF; Gaardhoje, JJ; Gagliardi, M; Gago, AM; Gal, A; Galvan, CD; Ganoti, P; Garabatos, C; Garcia, JRA; Garcia-Solis, E; Garg, K; Gargiulo, C; Garibli, A; Garner, K; Gasik, P; Gauger, EF; Ducati, MBG; Germain, M; Ghosh, J; Ghosh, P; Ghosh, SK; Giacalone, M; Gianotti, P; Giubellino, P; Giubilato, P; Glaenzer, AMC; Glassel, P; Gonzalez, V; Gonzalez-Trueba, LH; Gorbunov, S; Gorlich, L; Gotovac, S; Grabski, V; Graczykowski, LK; Graham, KL; Greiner, L; Grelli, A; Grigoras, C; Grigoriev, V; Grigoryan, A; Grigoryan, S; Groettvik, OS; Grosa, F; Grosse-Oetringhaus, JF; Grosso, R; Guernan
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