The ALICE Collaboration has studied J/psi production in pp collisions at sqrt(s)=7 TeV at the LHC through its muon pair decay. The polar and azimuthal angle distributions of the decay muons were measured, and results on the J/psi polarization parameters lambda_theta and lambda_phi were obtained. The study was performed in the kinematic region 2.5<y<4, 2<p_t<8 GeV/c, in the helicity and Collins-Soper reference frames. The results for lambda_theta in the helicity frame show a longitudinal polarization at low p_t, vanishing with increasing transverse momentum. All the other polarization parameters are consistent with zero, within uncertainties.

J/ψ Polarization in pp Collisions at sqrt[s]=7  TeV

BEOLE', Stefania;L. Bianchi;CORRALES MORALES, YASSER;FERRETTI, Alessandro;GAGLIARDI, Martino;GALLIO, Mauro;INNOCENTI, GIAN MICHELE;MARCHISONE, MASSIMILIANO;MASERA, Massimo;MILANO, LEONARDO;ORTONA, GIACOMO;VERCELLIN, Ermanno;
2012-01-01

Abstract

The ALICE Collaboration has studied J/psi production in pp collisions at sqrt(s)=7 TeV at the LHC through its muon pair decay. The polar and azimuthal angle distributions of the decay muons were measured, and results on the J/psi polarization parameters lambda_theta and lambda_phi were obtained. The study was performed in the kinematic region 2.5
2012
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B. Abelev;A. Abrahantes Quintana;D. Adamová;A. Adare;M. Aggarwal;G. Aglieri Rinella;A. Agocs;A. Agostinelli;S. Aguilar Salazar;Z. Ahammed;N. Ahmad;A. Ahmad Masoodi;S. Ahn;A. Akindinov;D. Aleksandrov;B. Alessandro;R. AlfaroMolina;A. Alici;A. Alkin;E. Almaráz Aviña;T. Alt;V. Altini;S. Altinpinar;I. Altsybeev;C. Andrei;A. Andronic;V. Anguelov;C. Anson;T. Antičić;F. Antinori;P. Antonioli;L. Aphecetche;H. Appelshäuser;N. Arbor;S. Arcelli;A. Arend;N. Armesto;R. Arnaldi;T. Aronsson;I. Arsene;M. Arslandok;A. Asryan;A. Augustinus;R. Averbeck;T. Awes;J. Äystö;M. Azmi;M. Bach;A. Badalà;Y. Baek;R. Bailhache;R. Bala;R. Baldini Ferroli;A. Baldisseri;A. Baldit;F. Baltasar Dos Santos Pedrosa;J. Bán;R. Baral;R. Barbera;F. Barile;G. Barnaföldi;L. Barnby;V. Barret;J. Bartke;M. Basile;N. Bastid;B. Bathen;G. Batigne;B. Batyunya;C. Baumann;I. Bearden;H. Beck;I. Belikov;F. Bellini;R. Bellwied;E. Belmont-Moreno;S. Beole;I. Berceanu;A. Bercuci;Y. Berdnikov;D. Berenyi;C. Bergmann;D. Berzano;L. Betev;A. Bhasin;A. Bhati;N. Bianchi;L. Bianchi;C. Bianchin;J. Bielčík;J. Bielčíková;A. Bilandzic;F. Blanco;F. Blanco;D. Blau;C. Blume;M. Boccioli;N. Bock;A. Bogdanov;H. Bøggild;M. Bogolyubsky;L. Boldizsár;M. Bombara;J. Book;H. Borel;A. Borissov;C. Bortolin;S. Bose;F. Bossú;M. Botje;S. Böttger;B. Boyer;P. Braun-Munzinger;M. Bregant;T. Breitner;M. Broz;R. Brun;E. Bruna;G. Bruno;D. Budnikov;H. Buesching;S. Bufalino;K. Bugaiev;O. Busch;Z. Buthelezi;D. Caffarri;X. Cai;H. Caines;E. Calvo Villar;P. Camerini;V. Canoa Roman;G. Cara Romeo;W. Carena;F. Carena;N. Carlin Filho;F. Carminati;C. Carrillo Montoya;A. Casanova Díaz;M. Caselle;J. Castillo Castellanos;J. Castillo Hernandez;E. Casula;V. Catanescu;C. Cavicchioli;J. Cepila;P. Cerello;B. Chang;S. Chapeland;J. Charvet;S. Chattopadhyay;S. Chattopadhyay;M. Cherney;C. Cheshkov;B. Cheynis;E. Chiavassa;V. Chibante Barroso;D. Chinellato;P. Chochula;M. Chojnacki;P. Christakoglou;C. Christensen;P. Christiansen;T. Chujo;S. Chung;C. Cicalò;L. Cifarelli;F. 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