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Measurement of the inclusive J/ψ polarization at forward rapidity in pp collisions at s√=8 TeV

, ; Acharya, S; Acosta, F. T.; Adamova, D.; Adolfsson, Jonatan LU ; Aggarwal, M. M.; Ahammed, Z.; Ahn, S. U.; Christiansen, Peter LU and Ljunggren, Martin LU , et al. (2018) In European Physical Journal C 78(7).
Abstract
We report on the measurement of the inclusive J/ψ polarization parameters in pp collisions at a center of mass energy 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/ψ 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 (λθ, λφ, λθφ) are measured as a function of pT both in the helicity and Collins-Soper reference frames. The measured J/ψ polarization parameters are found to be compatible with zero within uncertainties, contrary to expectations from all available predictions. The results are compared... (More)
We report on the measurement of the inclusive J/ψ polarization parameters in pp collisions at a center of mass energy 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/ψ 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 (λθ, λφ, λθφ) are measured as a function of pT both in the helicity and Collins-Soper reference frames. The measured J/ψ 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 s√=7 TeV. (Less)
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European Physical Journal C
volume
78
issue
7
publisher
Springer
external identifiers
  • scopus:85049776261
ISSN
1434-6044
DOI
10.1140/epjc/s10052-018-6027-2
language
English
LU publication?
yes
id
d8866988-6e71-4278-8198-525c65405b40
date added to LUP
2018-08-14 13:53:18
date last changed
2019-03-12 04:13:32
@article{d8866988-6e71-4278-8198-525c65405b40,
  abstract     = {We report on the measurement of the inclusive J/ψ polarization parameters in pp collisions at a center of mass energy 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/ψ resonances are reconstructed in their di-muon decay channel in the rapidity interval 2.5&lt;y&lt;4.0 and over the transverse-momentum interval 2&lt;pT&lt;15 GeV/c. The three polarization parameters (λθ, λφ, λθφ) are measured as a function of pT both in the helicity and Collins-Soper reference frames. The measured J/ψ 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 s√=7 TeV.},
  articleno    = {562},
  author       = {,  and Acharya, S and Acosta, F. T. and Adamova, D. and Adolfsson, Jonatan and Aggarwal, M. M. and Ahammed, Z. and Ahn, S. U. and Christiansen, Peter and Ljunggren, Martin and Nassirpour, Adrian and Oskarsson, Anders and Richert, Tuva and Silvermyr, David and Stenlund, Evert and Vislavicius, Vytautas and Zou, S.},
  issn         = {1434-6044},
  language     = {eng},
  number       = {7},
  publisher    = {Springer},
  series       = {European Physical Journal C},
  title        = {Measurement of the inclusive J/ψ polarization at forward rapidity in pp collisions at s√=8  TeV},
  url          = {http://dx.doi.org/10.1140/epjc/s10052-018-6027-2},
  volume       = {78},
  year         = {2018},
}