@article{3180722,
    title = "Measurement of the inclusive J/psi polarization at forward rapidity in
pp collisions at root s=8 TeV",
    author = "Acharya, S. and Acosta, F-T. and Adamova, D. and Adolfsson, J. and and Aggarwal, M. M. and Rinella, G. Aglieri and Agnello, M. and Agrawal, N. and and Ahammed, Z. and Ahn, S. U. and Aiola, S. and Akindinov, A. and and Al-Turany, M. and Alam, S. N. and Albuquerque, D. S. D. and Aleksandrov, and D. and Alessandro, B. and Molina, R. Alfaro and Ali, Y. and Alici, A. and and Alkin, A. and Alme, J. and Alt, T. and Altenkamper, L. and and Altsybeev, I. and Andrei, C. and Andreou, D. and Andrews, H. A. and and Andronic, A. and Angeletti, M. and Anguelov, V. and Anson, C. and and Anticic, T. and Antinori, F. and Antonioli, P. and Anwar, R. and and Apadula, N. and Aphecetche, L. and Appelshauser, H. and Arcelli, S. and and Arnaldi, R. and Arnold, O. W. and Arsene, I. C. and Arslandok, M. and and Audurier, B. and Augustinus, A. and Averbeck, R. and Azmi, M. D. and and Badala, A. and Baek, Y. W. and Bagnasco, S. and Bailhache, R. and Bala, and R. and Baldisseri, A. and Ball, M. and Baral, R. C. and Barbano, A. M. and and Barbera, R. and Barile, F. and Barioglio, L. and Barnafoldi, G. G. and and Barnby, L. S. and Barret, V. and Bartalini, P. and Barth, K. and and Bartsch, E. and Bastid, N. and Basu, S. and Batigne, G. and Camejo, A. and Batista and Batyunya, B. and Batzing, P. C. and Alba, J. L. Bazo and and Bearden, I. G. and Beck, H. and Bedda, C. and Behera, N. K. and Belikov, and I. and Bellini, F. and Martinez, H. Bello and Bellwied, R. and Beltran, and L. G. E. and Belyaev, V. and Bencedi, G. and Beole, S. and Bercuci, A. and and Berdnikov, Y. and Berenyi, D. and Bertens, R. A. and Berzano, D. and and Betev, L. and Bhaduri, P. P. and Bhasin, A. and Bhat, I. R. and Bhatt, and H. and Bhattacharjee, B. and Bhom, J. and Bianchi, A. and Bianchi, N. and and Bielcik, J. and Bielcikova, J. and Bilandzic, A. and Biro, G. and and Biswas, R. and Biswas, S. and Blair, J. T. and Blau, D. and Blume, C. and and Boca, G. and Bock, F. and Bogdanov, A. and Boldizsar, L. and and Bombara, M. and Bonomi, G. and Bonora, M. and Borel, H. and Borissov, A. and and Borri, M. and Botta, E. and Bourjau, C. and Bratrud, L. and and Braun-Munzinger, P. and Bregant, M. and Broker, T. A. and Broz, M. and and Brucken, E. J. and Bruna, E. and Bruno, G. E. and Budnikov, D. and and Bueschinh, H. and Bufalino, S. and Buhler, P. and Buncic, P. and Busch, and O. and Buthelezi, Z. and Butt, J. B. and Buxton, J. T. and Cabala, J. and and Caffarri, D. and Caines, H. and Caliva, A. and Villar, E. Calvo and and Camacho, R. S. and Camerini, P. and Capon, A. A. and Carena, F. and and Carena, W. and Carnesecchi, F. and Castellanos, J. Castillo and Castro, and A. J. and Casula, E. A. R. and Sanchez, C. 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E. and Xu, R. and Yalcin, S. and and Yamakawa, K. and Yano, S. and Yin, Z. and Yokoyama, H. and Yoo, I. -K. and and Yoon, J. H. and Yurchenko, V. and Zaccolo, V. and Zaman, A. and and Zampolli, C. and Zanolis, H. J. C. and Zardoshti, N. and Zarochentsev, and A. and Zavada, P. and Zaviyalov, N. and Zbroszczyk, H. and Zhalov, M. and and Zhang, X. and Zhang, Y. and Zhang, Z. and Zhao, C. and and Zherebchevskii, V. and Zhigareva, N. and Zhou, D. and Zhou, Y. and Zhou, and Z. and Zhu, H. and Zhu, J. and Zhu, Y. and Zichichi, A. and Zimmermann, and M. B. and Zinovjev, G. and Zmeskal, J. and Zou, S. and ALICE and Collaboration",
    journal = "The European Physical Journal C - Particles and Fields",
    year = "2018",
    volume = "78",
    number = "7",
    publisher = "Springer-Verlag",
    issn = "1434-6044, 1434-6052",
    doi = "10.1140/epjc/s10052-018-6027-2",
    abstract = "We report on the measurement of the inclusive J/psi polarization
parameters in pp collisions at a center of mass energy root s = 8 TeV
with the ALICE detector at the LHC. The analysis is based on a data
sample corresponding to an integrated luminosity of 1.23 pb(-1) J/psi
resonances are reconstructed in their di-muon decay channel in the
rapidity interval 2.5 < y < 4.0 and over the transverse-momentum
interval 2 < pT < 15 GeV/c. The three polarization parameters
(lambda(theta), lambda(phi), lambda(theta phi)) are measured as a
function of pT both in the helicity and Collins-Soper reference frames.
The measured J/psi polarization parameters are found to be compatible
with zero within uncertainties, contrary to expectations from all
available predictions. The results are compared with the measurement in
pp collisions at root s = 7 TeV."
}