Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/62952
Type: Artigo de periódico
Title: Charmonium and e(+)e(-) pair photoproduction at mid-rapidity in ultra-peripheral Pb-Pb collisions at root s(NN)=2.76 TeV
Author: Abbas, E
Abelev, B
Adam, J
Adamova, D
Adare, AM
Aggarwal, MM
Rinella, GA
Agnello, M
Agocs, AG
Agostinelli, A
Ahammed, Z
Ahmad, N
Masoodi, AA
Ahmed, I
Ahn, SA
Ahn, SU
Aimo, I
Ajaz, M
Akindinov, A
Aleksandrov, D
Alessandro, B
Alexandre, D
Alici, A
Alkin, A
Avina, EA
Alme, J
Alt, T
Altini, V
Altinpinar, S
Altsybeev, I
Andrei, C
Andronic, A
Anguelov, V
Anielski, J
Anson, C
Anticic, T
Antinori, F
Antonioli, P
Aphecetche, L
Appelshauser, H
Arbor, N
Arcelli, S
Arend, A
Armesto, N
Arnaldi, R
Aronsson, T
Arsene, IC
Arslandok, M
Asryan, A
Augustinus, A
Averbeck, R
Awes, TC
Aysto, J
Azmi, MD
Bach, M
Badala, A
Baek, YW
Bailhache, R
Bala, R
Baldisseri, A
Pedrosa, FBD
Ban, J
Baral, RC
Barbera, R
Barile, F
Barnafoldi, GG
Barnby, LS
Barret, V
Bartke, J
Basile, M
Bastid, N
Basu, S
Bathen, B
Batigne, G
Batyunya, B
Batzing, PC
Baumann, C
Bearden, IG
Beck, H
Behera, NK
Belikov, I
Bellini, F
Bellwied, R
Belmont-Moreno, E
Bencedi, G
Beole, S
Berceanu, I
Bercuci, A
Berdnikov, Y
Berenyi, D
Bergognon, AAE
Bertens, RA
Berzano, D
Betev, L
Bhasin, A
Bhati, AK
Bhom, J
Bianchi, L
Bianchi, N
Bianchin, C
Bielcik, J
Bielcikova, J
Bilandzic, A
Bjelogrlic, S
Blanco, F
Blanco, F
Blau, D
Blume, C
Boccioli, M
Bottger, S
Bogdanov, A
Boggild, H
Bogolyubsky, M
Boldizsar, L
Bombara, M
Book, J
Borel, H
Borissov, A
Bossu, F
Botje, M
Botta, E
Braidot, E
Braun-Munzinger, P
Bregant, M
Breitner, T
Broker, TA
Browning, TA
Broz, M
Brun, R
Bruna, E
Bruno, GE
Budnikov, D
Buesching, H
Bufalino, S
Buncic, P
Busch, O
Buthelezi, Z
Caffarri, D
Cai, X
Caines, H
Villar, EC
Camerini, P
Roman, VC
Romeo, GC
Carena, W
Carena, F
Carlin, N
Carminati, F
Diaz, AC
Castellanos, JC
Hernandez, JFC
Casula, EAR
Catanescu, V
Cavicchioli, C
Sanchez, CC
Cepila, J
Cerello, P
Chang, B
Chapeland, S
Charvet, JL
Chattopadhyay, S
Chattopadhyay, S
Cherney, M
Cheshkov, C
Cheynis, B
Barroso, VC
Chinellato, DD
Chochula, P
Chojnacki, M
Choudhury, S
Christakoglou, P
Christensen, CH
Christiansen, P
Chujo, T
Chung, SU
Cicalo, C
Cifarelli, L
Cindolo, F
Cleymans, J
Colamaria, F
Colella, D
Collu, A
Balbastre, GC
del Valle, ZC
Connors, ME
Contin, G
Contreras, JG
Cormier, TM
Morales, YC
Cortese, P
Maldonado, IC
Cosentino, MR
Costa, F
Cotallo, ME
Crescio, E
Crochet, P
Alaniz, EC
Albino, RC
Cuautle, E
Cunqueiro, L
Dainese, A
Dang, R
Danu, A
Das, K
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de Barros, GOV
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de Cuveland, J
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Denes, E
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Deppman, A
Erasmo, GD
de Rooij, R
Diaz Corchero, MA
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Majumdar, AKD
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Emschermann, D
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Abstract: The ALICE Collaboration at the LHC has measured the J/psi and psi' photoproduction at mid-rapidity in ultra-peripheral Pb-Pb collisions at root s(NN) = 2.76 TeV. The charmonium is identified via its leptonic decay for events where the hadronic activity is required to be minimal. The analysis is based on an event sample corresponding to an integrated luminosity of about 23 mu b(-1). The cross section for coherent and incoherent J/psi production in the rapidity interval -0.9 < y < 0.9, are d sigma(coh)(J/psi)/dy = 2.38(-0.24)(+0.34)(sta + sys) mb and d sigma(inc)(J/psi)/dy = 0.98(-0.17)(+0.19)(sta + sys) mb and , respectively. The results are compared to theoretical models for J/psi production and the coherent cross section is found to be in good agreement with those models incorporating moderate nuclear gluon shadowing at Bjorken-x around 10(-3), such as EPS09 parametrization. In addition the cross section for the process gamma gamma -> e(+)e(-) has been measured and found to be in agreement with models implementing QED at leading order.
Country: EUA
Editor: Springer
Rights: fechado
Identifier DOI: 10.1140/epjc/s10052-013-2617-1
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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