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

S Acharya; F. T. Acosta; D. Adamova; Jonatan Adolfsson; M. M. Aggarwal; Z. Ahammed; S. U. Ahn; Peter Christiansen; Martin Ljunggren; Adrian Nassirpour; Anders Oskarsson; Tuva Richert; David Silvermyr; Evert Stenlund; Vytautas Vislavicius; S. Zou; ALICE Collaboration

doi:10.1140/epjc/s10052-018-6027-2

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

S Acharya, F. T. Acosta, D. Adamova, Jonatan Adolfsson, M. M. Aggarwal, Z. Ahammed, S. U. Ahn, Peter Christiansen, Martin Ljunggren, Adrian Nassirpour, Anders Oskarsson, Tuva Richert, David Silvermyr, Evert Stenlund, Vytautas Vislavicius, S. Zou, ALICE Collaboration

Research output: Contribution to journal › Article › peer-review

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 with the measurement in pp collisions at s√=7 TeV.

Original language	English
Article number	562
Journal	European Physical Journal C
Volume	78
Issue number	7
DOIs	https://doi.org/10.1140/epjc/s10052-018-6027-2
Publication status	Published - 2018

Bibliographical note

The authors listed here are only a few of all authors. For information
about all authors of the publication, please see the original
publication.

Subject classification (UKÄ)

Subatomic Physics

Access to Document

10.1140/epjc/s10052-018-6027-2

Cite this

Acharya, S., Acosta, F. T., Adamova, D., Adolfsson, J., Aggarwal, M. M., Ahammed, Z., Ahn, S. U., Christiansen, P., Ljunggren, M., Nassirpour, A., Oskarsson, A., Richert, T., Silvermyr, D., Stenlund, E., Vislavicius, V., Zou, S., & ALICE Collaboration (2018). Measurement of the inclusive J/ψ polarization at forward rapidity in pp collisions at s√=8 TeV. European Physical Journal C, 78(7), Article 562. https://doi.org/10.1140/epjc/s10052-018-6027-2

@article{d88669886e7142788198525c65405b40,

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

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 with the measurement in pp collisions at s√=7 TeV.",

author = "S Acharya and Acosta, {F. T.} and D. Adamova and Jonatan Adolfsson and Aggarwal, {M. M.} and Z. Ahammed and Ahn, {S. U.} and Peter Christiansen and Martin Ljunggren and Adrian Nassirpour and Anders Oskarsson and Tuva Richert and David Silvermyr and Evert Stenlund and Vytautas Vislavicius and S. Zou and {ALICE Collaboration}",

note = "The authors listed here are only a few of all authors. For information about all authors of the publication, please see the original publication.",

year = "2018",

doi = "10.1140/epjc/s10052-018-6027-2",

language = "English",

volume = "78",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer Nature",

number = "7",

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Acharya, S, Acosta, FT, Adamova, D, Adolfsson, J, Aggarwal, MM, Ahammed, Z, Ahn, SU, Christiansen, P, Ljunggren, M, Nassirpour, A , Oskarsson, A, Richert, T, Silvermyr, D , Stenlund, E, Vislavicius, V, Zou, S & ALICE Collaboration 2018, 'Measurement of the inclusive J/ψ polarization at forward rapidity in pp collisions at s√=8 TeV', European Physical Journal C, vol. 78, no. 7, 562. https://doi.org/10.1140/epjc/s10052-018-6027-2

TY - JOUR

T1 - Measurement of the inclusive J/ψ polarization at forward rapidity in pp collisions at s√=8 TeV

AU - Acharya, S

AU - Acosta, F. T.

AU - Adamova, D.

AU - Adolfsson, Jonatan

AU - Aggarwal, M. M.

AU - Ahammed, Z.

AU - Ahn, S. U.

AU - Christiansen, Peter

AU - Ljunggren, Martin

AU - Nassirpour, Adrian

AU - Oskarsson, Anders

AU - Richert, Tuva

AU - Silvermyr, David

AU - Stenlund, Evert

AU - Vislavicius, Vytautas

AU - Zou, S.

AU - ALICE Collaboration

N1 - The authors listed here are only a few of all authors. For information about all authors of the publication, please see the original publication.

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

U2 - 10.1140/epjc/s10052-018-6027-2

DO - 10.1140/epjc/s10052-018-6027-2

M3 - Article

SN - 1434-6044

VL - 78

JO - European Physical Journal C

JF - European Physical Journal C

IS - 7

M1 - 562