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

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We report on the measurement of the inclusive J/ψψ\psi polarization parameters in pp collisions at a center of mass energy s√=8s=8\sqrt{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−1−1^{-1}. J/ψψ\psi resona...

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Main Authors: Acharya, Shreyasi (Author) , Angelov, Venelin (Author) , Arslandok, Mesut (Author) , Danisch, Meike (Author) , Deisting, Alexander (Author) , Feuillard, Victor (Author) , Glässel, Peter (Author) , Kim, Jiyoung (Author) , Köhler, Markus Konrad (Author) , Klewin, Sebastian (Author) , Leardini, Lucia (Author) , Mercado Pérez, Jorge (Author) , Ohlson, Alice (Author) , Pachmayer, Yvonne C. (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Schmidt, Marten Ole (Author) , Stachel, Johanna (Author) , Weiser, Dennis (Author) , Windelband, Bernd (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: 9 July 2018
In: The European physical journal. C, Particles and fields
Year: 2018, Volume: 78, Issue: 6
ISSN:1434-6052
DOI:10.1140/epjc/s10052-018-6027-2
Online Access:Verlag, Volltext: https://doi.org/10.1140/epjc/s10052-018-6027-2
Verlag, Volltext: https://link.springer.com/content/pdf/10.1140%2Fepjc%2Fs10052-018-6027-2.pdf
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Author Notes:ALICE Collaboration*
Description
Summary:We report on the measurement of the inclusive J/ψψ\psi polarization parameters in pp collisions at a center of mass energy s√=8s=8\sqrt{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−1−1^{-1}. J/ψψ\psi resonances are reconstructed in their di-muon decay channel in the rapidity interval 2.5<y<4.02.5<y<4.02.5< y < 4.0 and over the transverse-momentum interval 2<pT<152<pT<152< p_\mathrm{T} < 15 GeV/cGeV/c\mathrm {GeV}/c. The three polarization parameters (λθλθ\lambda _\theta , λφλφ\lambda _\varphi , λθφλθφ\lambda _{\theta \varphi }) are measured as a function of pTpTp_\mathrm{T} both in the helicity and Collins-Soper reference frames. The measured J/ψψ\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 s√=7s=7\sqrt{s} = 7 TeV.
Item Description:Im Titel wird psi als griechischer Buchstabe dargestellt
ALICE Collaboration: S. Acharya, V. Anguelov, M. Arslandok, M.C. Danisch, A. Deisting, V. Feuillard, P. Glässel, J. Kim, M.K. Köhler, S. Klewin, L. Leardini, J. Mercado Pérez, A. Ohlson, Y. Pachmayer, K. Reygers, R. Schicker, M.O. Schmidt, J. Stachel, D.F. Weiser, B. Windelband [und weitere]
Gesehen am 24.06.2019
Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-018-6027-2

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