Measurement of an Excess in the Yield of J/ψ at Very Low p_{T} in Pb-Pb Collisions at sqrt[s]_{NN}=2.76 TeV.
J Adam, D Adamová, M M Aggarwal, G Aglieri Rinella, M Agnello, N Agrawal, Z Ahammed, S U Ahn, S Aiola, A Akindinov, S N Alam, D Aleksandrov, B Alessandro, D Alexandre, R Alfaro Molina, A Alici, A Alkin, J R M Almaraz, J Alme, T Alt, S Altinpinar, I Altsybeev, C Alves Garcia Prado, C Andrei, A Andronic, V Anguelov, J Anielski, T Antičić, F Antinori, P Antonioli, L Aphecetche, H Appelshäuser, S Arcelli, R Arnaldi, O W Arnold, I C Arsene, M Arslandok, B Audurier, A Augustinus, R Averbeck, M D Azmi, A Badalà, Y W Baek, S Bagnasco, R Bailhache, R Bala, A Baldisseri, R C Baral, A M Barbano, R Barbera, F Barile, G G Barnaföldi, L S Barnby, V Barret, P Bartalini, K Barth, J Bartke, E Bartsch, M Basile, N Bastid, S Basu, B Bathen, G Batigne, A Batista Camejo, B Batyunya, P C Batzing, I G Bearden, H Beck, C Bedda, N K Behera, I Belikov, F Bellini, H Bello Martinez, R Bellwied, R Belmont, E Belmont-Moreno, V Belyaev, G Bencedi, S Beole, I Berceanu, A Bercuci, Y Berdnikov, D Berenyi, R A Bertens, D Berzano, L Betev, A Bhasin, I R Bhat, A K Bhati, B Bhattacharjee, J Bhom, L Bianchi, N Bianchi, C Bianchin, J Bielčík, J Bielčíková, A Bilandzic, R Biswas, S Biswas, S Bjelogrlic, J T Blair, D Blau, C Blume, F Bock, A Bogdanov, H Bøggild, L Boldizsár, M Bombara, J Book, H Borel, A Borissov, M Borri, F Bossú, E Botta, S Böttger, C Bourjau, P Braun-Munzinger, M Bregant, T Breitner, T A Broker, T A Browning, M Broz, E J Brucken, E Bruna, G E Bruno, D Budnikov, H Buesching, S Bufalino, P Buncic, O Busch, Z Buthelezi, J B Butt, J T Buxton, D Caffarri, X Cai, H Caines, L Calero Diaz, A Caliva, E Calvo Villar, P Camerini, F Carena, W Carena, F Carnesecchi, J Castillo Castellanos, A J Castro, E A R Casula, C Ceballos Sanchez, J Cepila, P Cerello, J Cerkala, B Chang, S Chapeland, M Chartier, J L Charvet, S Chattopadhyay, S Chattopadhyay, V Chelnokov, M Cherney, C Cheshkov, B Cheynis, V Chibante Barroso, D D Chinellato, S Cho, P Chochula, K Choi, M Chojnacki, S Choudhury, P Christakoglou, C H Christensen, P Christiansen, T Chujo, S U Chung, C Cicalo, L Cifarelli, F Cindolo, J Cleymans, F Colamaria, D Colella, A Collu, M Colocci, G Conesa Balbastre, Z Conesa Del Valle, M E Connors, J G Contreras, T M Cormier, Y Corrales Morales, I Cortés Maldonado, P Cortese, M R Cosentino, F Costa, P Crochet, R Cruz Albino, E Cuautle, L Cunqueiro, T Dahms, A Dainese, A Danu, D Das, I Das, S Das, A Dash, S Dash, S De, A De Caro, G de Cataldo, C de Conti, J de Cuveland, A De Falco, D De Gruttola, N De Marco, S De Pasquale, A Deisting, A Deloff, E Dénes, C Deplano, P Dhankher, D Di Bari, A Di Mauro, P Di Nezza, M A Diaz Corchero, T Dietel, P Dillenseger, R Divià, Ø Djuvsland, A Dobrin, D Domenicis Gimenez, B Dönigus, O Dordic, T Drozhzhova, A K Dubey, A Dubla, L Ducroux, P Dupieux, R J Ehlers, D Elia, H Engel, E Epple, B Erazmus, I Erdemir, F Erhardt, B Espagnon, M Estienne, S Esumi, J Eum, D Evans, S Evdokimov, G Eyyubova, L Fabbietti, D Fabris, J Faivre, A Fantoni, M Fasel, L Feldkamp, A Feliciello, G Feofilov, J Ferencei, A Fernández Téllez, E G Ferreiro, A Ferretti, A Festanti, V J G Feuillard, J Figiel, M A S Figueredo, S Filchagin, D Finogeev, F M Fionda, E M Fiore, M G Fleck, M Floris, S Foertsch, P Foka, S Fokin, E Fragiacomo, A Francescon, U Frankenfeld, U Fuchs, C Furget, A Furs, M Fusco Girard, J J Gaardhøje, M Gagliardi, A M Gago, M Gallio, D R Gangadharan, P Ganoti, C Gao, C Garabatos, E Garcia-Solis, C Gargiulo, P Gasik, E F Gauger, M Germain, A Gheata, M Gheata, P Ghosh, S K Ghosh, P Gianotti, P Giubellino, P Giubilato, E Gladysz-Dziadus, P Glässel, D M Goméz Coral, A Gomez Ramirez, V Gonzalez, P González-Zamora, S Gorbunov, L Görlich, S Gotovac, V Grabski, O A Grachov, L K Graczykowski, K L Graham, A Grelli, A Grigoras, C Grigoras, V Grigoriev, A Grigoryan, S Grigoryan, B Grinyov, N Grion, J M Gronefeld, J F Grosse-Oetringhaus, J-Y Grossiord, R Grosso, F Guber, R Guernane, B Guerzoni, K Gulbrandsen, T Gunji, A Gupta, R Gupta, R Haake, Ø Haaland, C Hadjidakis, M Haiduc, H Hamagaki, G Hamar, J W Harris, A Harton, D Hatzifotiadou, S Hayashi, S T Heckel, M Heide, H Helstrup, A Herghelegiu, G Herrera Corral, B A Hess, K F Hetland, H Hillemanns, B Hippolyte, R Hosokawa, P Hristov, M Huang, T J Humanic, N Hussain, T Hussain, D Hutter, D S Hwang, R Ilkaev, M Inaba, M Ippolitov, M Irfan, M Ivanov, V Ivanov, V Izucheev, P M Jacobs, M B Jadhav, S Jadlovska, J Jadlovsky, C Jahnke, M J Jakubowska, H J Jang, M A Janik, P H S Y Jayarathna, C Jena, S Jena, R T Jimenez Bustamante, P G Jones, H Jung, A Jusko, P Kalinak, A Kalweit, J Kamin, J H Kang, V Kaplin, S Kar, A Karasu Uysal, O Karavichev, T Karavicheva, L Karayan, E Karpechev, U Kebschull, R Keidel, D L D Keijdener, M Keil, M Mohisin Khan, P Khan, S A Khan, A Khanzadeev, Y Kharlov, B Kileng, D W Kim, D J Kim, D Kim, H Kim, J S Kim, M Kim, M Kim, S Kim, T Kim, S Kirsch, I Kisel, S Kiselev, A Kisiel, G Kiss, J L Klay, C Klein, J Klein, C Klein-Bösing, S Klewin, A Kluge, M L Knichel, A G 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We report on the first measurement of an excess in the yield of J/ψ at very low transverse momentum (p_{T}<0.3 GeV/c) in peripheral hadronic Pb-Pb collisions at sqrt[s_{NN}]=2.76 TeV, performed by ALICE at the CERN LHC. Remarkably, the measured nuclear modification factor of J/ψ in the rapidity range 2.5<y<4 reaches about 7 (2) in the p_{T} range 0-0.3 GeV/c in the 70%-90% (50%-70%) centrality class. The J/ψ production cross section associated with the observed excess is obtained under the hypothesis that coherent photoproduction of J/ψ is the underlying physics mechanism. If confirmed, the observation of J/ψ coherent photoproduction in Pb-Pb collisions at impact parameters smaller than twice the nuclear radius opens new theoretical and experimental challenges and opportunities. In particular, coherent photoproduction accompanying hadronic collisions may provide insight into the dynamics of photoproduction and nuclear reactions, as well as become a novel probe of the quark-gluon plasma.
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