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

S. Acharya; F Acosta; D. Adamova; Jan Adolfsson; MM. Aggarwal; G.A. Rinella; Maria Agnello; N. Agrawal; Z. Ahammed; S.U. Ahn; S. Aiola; A. Akindinov; M. Al-Turany; SN Alam; DSD Albuquerque; D. Aleksandrov; B Alessandro; Ian Bearden; Ante Bilandzic; Lais Ozelin de Lima Pimentel; Christian Alexander Bourjau; Jens Jørgen Gaardhøje; Marek Chojnacki; Freja Thoresen; Børge Svane Nielsen; bsm989 bsm989; Vojtech Pacik; Vytautas Vislavicius; You Zhou; Katarina Gajdosova; rtc312 rtc312

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

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

S. Acharya, F Acosta, D. Adamova, Jan Adolfsson, MM. Aggarwal, G.A. Rinella, Maria Agnello, N. Agrawal, Z. Ahammed, S.U. Ahn, S. Aiola, A. Akindinov, M. Al-Turany, SN Alam, DSD Albuquerque, D. Aleksandrov, B Alessandro, Ian Bearden, Ante Bilandzic, Lais Ozelin de Lima PimentelChristian Alexander Bourjau, Jens Jørgen Gaardhøje, Marek Chojnacki, Freja Thoresen, Børge Svane Nielsen, bsm989 bsm989, Vojtech Pacik, Vytautas Vislavicius, You Zhou, Katarina Gajdosova, rtc312 rtc312

Experimental Particle Physics

13 Citations (Scopus)

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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 < p_T< 15 GeV / c. The three polarization parameters (λ_θ, λ_φ, λ_θ _φ) are measured as a function of p_T 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
Number of pages	13
ISSN	1434-6044
DOIs	https://doi.org/10.1140/epjc/s10052-018-6027-2
Publication status	Published - 1 Jul 2018

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Acharya, S., Acosta, F., Adamova, D., Adolfsson, J., Aggarwal, MM., Rinella, G. A., Agnello, M., Agrawal, N., Ahammed, Z., Ahn, S. U., Aiola, S., Akindinov, A., Al-Turany, M., Alam, SN., Albuquerque, DSD., Aleksandrov, D., Alessandro, B., Bearden, I., Bilandzic, A., ... rtc312, R. (2018). Measurement of the inclusive J/psi polarization at forward rapidity in pp collisions at root s=8 TeV. European Physical Journal C, 78(7), Article 562. https://doi.org/10.1140/epjc/s10052-018-6027-2

Acharya, S, Acosta, F, Adamova, D, Adolfsson, J, Aggarwal, MM, Rinella, GA, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aiola, S, Akindinov, A, Al-Turany, M, Alam, SN, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Bearden, I, Bilandzic, A, Pimentel, LODL, Bourjau, CA, Gaardhøje, JJ, Chojnacki, M, Thoresen, F, Nielsen, BS , bsm989, B, Pacik, V, Vislavicius, V, Zhou, Y, Gajdosova, K & rtc312, R 2018, 'Measurement of the inclusive J/psi polarization at forward rapidity in pp collisions at root s=8 TeV', European Physical Journal C, vol. 78, no. 7, 562. https://doi.org/10.1140/epjc/s10052-018-6027-2

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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, λθ φ) 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 F Acosta and D. Adamova and Jan Adolfsson and MM. Aggarwal and G.A. Rinella and Maria Agnello and N. Agrawal and Z. Ahammed and S.U. Ahn and S. Aiola and A. Akindinov and M. Al-Turany and SN Alam and DSD Albuquerque and D. Aleksandrov and B Alessandro and Ian Bearden and Ante Bilandzic and Pimentel, {Lais Ozelin de Lima} and Bourjau, {Christian Alexander} and Gaardh{\o}je, {Jens J{\o}rgen} and Marek Chojnacki and Freja Thoresen and Nielsen, {B{\o}rge Svane} and bsm989 bsm989 and Vojtech Pacik and Vytautas Vislavicius and You Zhou and Katarina Gajdosova and rtc312 rtc312",

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AU - Acharya, S.

AU - Acosta, F

AU - Adamova, D.

AU - Adolfsson, Jan

AU - Aggarwal, MM.

AU - Rinella, G.A.

AU - Agnello, Maria

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahn, S.U.

AU - Aiola, S.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Alam, SN

AU - Albuquerque, DSD

AU - Aleksandrov, D.

AU - Alessandro, B

AU - Bearden, Ian

AU - Bilandzic, Ante

AU - Pimentel, Lais Ozelin de Lima

AU - Bourjau, Christian Alexander

AU - Gaardhøje, Jens Jørgen

AU - Chojnacki, Marek

AU - Thoresen, Freja

AU - Nielsen, Børge Svane

AU - bsm989, bsm989

AU - Pacik, Vojtech

AU - Vislavicius, Vytautas

AU - Zhou, You

AU - Gajdosova, Katarina

AU - rtc312, rtc312

PY - 2018/7/1

Y1 - 2018/7/1

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, λθ φ) 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, λθ φ) 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 - Journal article

SN - 1434-6044

VL - 78

JO - European Physical Journal C

JF - European Physical Journal C

IS - 7

M1 - 562

ER -

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

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