Abstract

The ALICE experiment at the LHC has studied inclusive J/psi production at central and forward rapidities in pp collisions at root s = 7 TeV. In this Letter, we report on the first results obtained detecting the J/psi through the dilepton decay into e(+)e(-) and mu(+)mu(-) pairs in the rapidity ranges vertical bar y vertical bar < 0.9 and 2.5 < y < 4, respectively, and with acceptance down to zero PT. In the dielectron channel the analysis was carried Out on a data sample corresponding to an integrated luminosity L(int) = 5.6 nb(-1) and the number of signal events is N(J/psi) = 352 +/- 32 (stat.) +/- 28 (syst.): the corresponding figures in the dimuon channel are L(int) = 15.6 nb(-1) and N(J/psi) = 1924 +/- 77 (stat.) +/- 144 (syst.). The measured production cross sections are sigma(J/psi) (vertical bar y vertical bar < 0.9) = 10.7 +/- 1.0 (stat.) +/- 1.6 (syst.)(-2.3)(+1.6) (syst.pol.) mu b and sigma(J/psi) (2.5 < y < 4) = 6.31 +/- 0.25 (stat.) +/- 0.76 (syst.)(-1.96)(+0.95) (syst.pol.) mu b. The differential cross sections, in transverse momentum and rapidity, of the J/psi were also measured. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.

Autore Pugliese

• Mastroserio Annalisa

Tutti gli autori

• Aamodt K , Quintana Aa , Adamova D , Adare Am , Aggarwal Mm , Rinella Ga , Agocs Ag , Agostinelli A , Salazar Sa , Ahammed Z , Ahmad N , Masoodi Aa , Ahn Su , Akindinov A , Aleksandrov D , Alessandro B , Molina Ra , Alici A , Alkin A , Avina Ea , Alme J , Alt T , Altini V , Altsybeev I , Andrei C , Andronic A , Anguelov V , 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 , Asryan A , Augustinus A , Averbeck R , Awes Tc , Aysto J , Azmi Md , Bach M , Badala A , Baek Yw , Bailhache R , Bala R , Ferroli Rb , Baldisseri A , Baldit A , Ban J , Barbera R , Barile F , Barnafoldi Gg , Barnby Ls , Barret V , Bartke J , Basile M , Bastid N , Bathen B , Batigne G , Batyunya B , Baumann C , Bearden Ig , Beck H , Belikov I , Bellini F , Bellwied R , Belmont Moreno E , Beole S , Berceanu I , Bercuci A , Berdermann E , Berdnikov Y , Bergmann C , Betev L , Bhasin A , Bhati Ak , Bianchi L , Bianchi N , Bianchin C , Bielcik J , Bielcikova J , Bilandzic A , Biolcati E , Blanc A , Blanco F , Blanco F , Blau D , Blume C , Bock N , Bogdanov A , Boggild H , Bogolyubsky M , Boldizsar L , Bombara M , Bombonati C , Book J , Borel H , Borissov A , Bortolin C , Bose S , Bossu F , Botje M , Bottger S , Boyer B , Braun Munzinger P , Bravina L , Bregant M , Breitner T , Broz M , Brun R , Bruna E , Bruno Ge , Budnikov D , Buesching H , Bufalino S , Busch O , Buthelezi Z , Caffarri D , Cai X , Caines H , Villar Ec , Camerini P , Roman Vc , Romeo Gc , Carena F , Carena W , Carminati F , Diaz Ac , Caselle M , Castellanos Jc , Catanescu V , Cavicchioli C , Cepila J , Cerello P , Chang B , Chapeland S , Charvet Jl , Chattopadhyay S , Chattopadhyay S , Cherney M , Cheshkov C , Cheynis B , Chiavassa E , Barroso Vc , Chinellato Dd , Chochula P , Chojnacki M , Christakoglou P , Christensen Ch , Christiansen P , Chujo T , Cicalo C , Cifarelli L , Cindolo F , Cleymans J , Coccetti F , Coffin Jp , Balbastre Gc , del Valle Zc , Constantin R , Contin G , Contreras Jg , Cormier Tm , Morales Yc , Maldonado Ic , Cortese P , Cosentino Mr , Costa F , Cotallo Me , Crescio E , Crochet P , Cuautle E , Cunqueiro L , Erasmo Gd , Dainese A , Dalsgaard Hh , Danu A , Das D , Das I , Dash A , Dash S , De S , Moregula Ad , de Barros Gov , De Caro A , de Cataldo G , de Cuveland J , De Falco A , De Gruttola D , De Marco N , De Pasquale S , De Rooij R , Sanchez Ed , Delagrange H , Mercado Yd , Dellacasa G , Deloff A , Demanov V , Denes E , Deppman A , Di Bari D , Di Giglio C , Di Liberto S , Di Mauro A , Di Nezza P , Dietel T , Divia R , Djuvsland O , Dobrin A , Dobrowolski T , Dominguez I , Donigus B , Dordic O , Driga O , Dubey Ak , Ducroux L , Dupieux P , Majumdar Akd , Majumdar Mrd , Elia D , Emschermann D , Engel H , Erdal Ha , Espagnon B , Estienne M , Esumi S , Evans D , Evrard S , Eyyubova G , Fabris D , Faivre J , Falchieri D , Fantoni A , Fasel M , Fearick R , Fedunov A , Fehlker D , Fekete V , Felea D , Feofilov G , Tellez Af , Ferreiro Eg , Ferretti A , Ferretti R , Figueredo Mas , Filchagin S , Fini R , Finogeev D , Fionda Fm , Fiore Em , Floris M , Foertsch S , Foka P , Fokin S , Fragiacomo E , Fragkiadakis M , Frankenfeld U , Fuchs U , Furano F , Furget C , Girard Mf , Gaardhoje Jj , Gadrat S , Gagliardi M , Gago A , Gallio M , Ganoti R , Garabatos C , Garcia Solis E , Gemme R , Gerhard J , Germain M , Geuna C , Gheata A , Gheata M , Ghidini B , Ghosh P , Gianotti R , Girard Mr , Giubellino P , Gladysz Dziadus E , Glassel P , Gomez R , Gonzalez Trueba Lh , Gonzalez Zamora P , Gorbunov S , Gotovac S , Grabski V , Graczykowski Lk , Grajcarek R , Grelli A , Grigoras A , Grigoras C , Grigoriev V , Grigoryan A , Grigoryan S , Grinyov B , Grion N , Gros P , Grosse Oetringhaus Jf , Grossiord Jy , Guber F , Guernane R , Gutierrez Cg , Guerzoni B , Gulbrandsen K , Gulkanyan H , Gunji T , Gupta A , Gupta R , Gutbrod H , Haaland O , Hadjidakis C , Haiduc M , Hamagaki H , Hama

Titolo volume/Rivista

PHYSICS LETTERS. SECTION B

Anno di pubblicazione

2011

ISSN

0370-2693

ISBN

Non Disponibile

Numero di citazioni Wos

91

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

102

Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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