@article{3152617,
    title = "J/psi Polarization in pp Collisions at root s=7 TeV",
    author = "Abelev, B. and Quintana, A. Abrahantes and Adamova, D. and Adare, A. M. and and Aggarwal, M. M. and Rinella, G. Aglieri and Agocs, A. G. and and Agostinelli, A. and Aguilar Salazar, S. and Ahammed, Z. and Ahmad, N. and and Masoodi, A. Ahmad and Ahn, S. U. and Akindinov, A. and Aleksandrov, and D. and Alessandro, B. and AlfaroMolina, R. and Alici, A. and Alkin, A. and and Almaraz Avina, E. and Alt, T. and Altini, V. and Altinpinar, S. and and Altsybeev, I. and Andrei, C. and Andronic, A. and Anguelov, V. and and Anson, C. and Anticic, T. and Antinori, F. and Antonioli, P. and and Aphecetche, L. and Appelshaeuser, H. and Arbor, N. and Arcelli, S. and and Arend, A. and Armesto, N. and Arnaldi, R. and Aronsson, T. and Arsene, and I. C. and Arslandok, M. and Asryan, A. and Augustinus, A. and Averbeck, and R. and Awes, T. C. and Aysto, J. and Azmi, M. D. and Bach, M. and and Badala, A. and Baek, Y. W. and Bailhache, R. and Bala, R. and Ferroli, and R. 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K. and Bianchi, N. and Bianchi, L. and Bianchin, C. and and Bielcik, J. and Bielcikova, J. and Bilandzic, A. and Blanco, F. and and Blanco, F. and Blau, D. and Blume, C. and Boccioli, M. and Bock, N. and and Bogdanov, A. and Boggild, H. and Bogolyubsky, M. and Boldizsar, L. and and Bombara, M. and Book, J. and Borel, H. and Borissov, A. and Bortolin, C. and and Bose, S. and Bossu, F. and Botje, M. and Boettger, S. and Boyer, B. and and Braun-Munzinger, P. and Bregant, M. and Breitner, T. and Broz, M. and and Brun, R. and Bruna, E. and Bruno, G. E. and Budnikov, D. and and Buesching, H. and Bufalino, S. and Bugaiev, K. and Busch, O. and and Buthelezi, Z. and Caffarri, D. and Cai, X. and Caines, H. and Calvo and Villar, E. and Camerini, P. and Canoa Roman, V. and Romeo, G. Cara and and Carena, W. and Carena, F. and Carlin Filho, N. and Carminati, F. and and Montoya, C. A. Carrillo and Diaz, A. Casanova and Caselle, M. and and Castellanos, J. Castillo and Hernandez, J. F. 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Xaplanteris and Yang, H. and Yano, S. and and Yasnopolskiy, S. and Yi, J. and Yin, Z. and Yokoyama, H. and Yoo, I. and -K. and Yoon, J. and Yu, W. and Yuan, X. and Yushmanov, I. and Zach, C. and and Zampolli, C. and Zaporozhets, S. and Zarochentsev, A. and Zavada, P. and and Zaviyalov, N. and Zbroszczyk, H. and Zelnicek, P. and Zgura, I. and and Zhalov, M. and Zhang, X. and Zhou, F. and Zhou, D. and Zhou, Y. and Zhu, and X. and Zichichi, A. and Zimmermann, A. and Zinovjev, G. and Zoccarato, and Y. and Zynovyev, M. and ALICE Collaboration",
    journal = "Physical Review and Physical Review Letters Index",
    year = "2012",
    volume = "108",
    number = "8",
    publisher = "AMER PHYSICAL SOC",
    issn = "0094-0003",
    doi = "10.1103/PhysRevLett.108.082001",
    abstract = "The ALICE Collaboration has studied J/psi production in pp collisions at
root 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. In both frames, the polarization
parameters are compatible with zero, within uncertainties."
}