Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

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 ; Ljunggren, Martin LU and Nassirpour, Adrian LU orcid , 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)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; ; and , et al. (More)
; ; ; ; ; ; ; ; ; ; ; ; ; ; and (Less)
author collaboration
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C
volume
78
issue
7
article number
562
publisher
Springer
external identifiers
  • scopus:85049776261
ISSN
1434-6044
DOI
10.1140/epjc/s10052-018-6027-2
language
English
LU publication?
yes
additional info
The authors listed here are only a few of all authors. For information about all authors of the publication, please see the original publication.
id
d8866988-6e71-4278-8198-525c65405b40
date added to LUP
2018-08-14 13:53:18
date last changed
2023-07-25 13:38:34
@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.}},
  author       = {{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}},
  doi          = {{10.1140/epjc/s10052-018-6027-2}},
  volume       = {{78}},
  year         = {{2018}},
}