Search for collectivity with azimuthal J/ψ-hadron correlations in high multiplicity p-Pb collisions at ,√sNN=5.02 and 8.16 TeV

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초록

We present a measurement of azimuthal correlations between inclusive J/psi and charged hadrons in p-Pb collisions recorded with the ALICE detector at the CERN LHC. The J/psi are reconstructed at forward (p-going, 2.03 < y < 3.53) and backward (Pb-going, -4.46 < y < -2.96) rapidity via their mu(+)mu(-) decay channel, while the charged hadrons are reconstructed at mid-rapidity (vertical bar eta vertical bar < 1.8). The correlations are expressed in terms of associated charged-hadron yields per W . trigger. A rapidity gap of at least 1.5 units is required between the trigger J/psi and the associated charged hadrons. Possible correlations due to collective effects are assessed by subtracting the associated per-trigger yields in the low-multiplicity collisions from those in the high-multiplicity collisions. After the subtraction, we observe a strong indication of remaining symmetric structures at Delta phi approximate to 0 and Delta phi approximate to pi), similar to those previously found in two-particle correlations at middle and forward rapidity. The corresponding second-order Fourier coefficient (v(2) ) in the transverse momentum interval between 3 and 6 GeV/c is found to be positive with a significance of about 5 sigma. The obtained results are similar to the J/psi v(2) coefficients measured in Pb-Pb collisions at root s(NN) = 5.02 TeV, suggesting a common mechanism at the origin of the J/psi v(2) . (C) 2018 The Author. Published by Elsevier B.V.

키워드

LONG-RANGEANGULAR-CORRELATIONS2-PARTICLE CORRELATIONSCHARMONIUM PRODUCTIONPROTON-PROTONHEAVY-FLAVORPLUS PBSUPPRESSIONPPB
제목
Search for collectivity with azimuthal J/ψ-hadron correlations in high multiplicity p-Pb collisions at ,√sNN=5.02 and 8.16 TeV
저자
Acharya, S.Adamova, D.Adolfsson, J.Aggarwal, M. M.Rinella, G. AglieriAgnello, M.Agrawal, N.Ahammed, Z.Ahn, S. U.Aiola, S.Akindinov, A.Al-Turany, M.Alam, S. N.Albuquerque, D. S. D.Aleksandrov, D.Alessandro, B.Molina, R. AlfaroAli, Y.Alici, A.Alkin, A.Alme, J.Alt, T.Altenkamper, L.Altsybeev, I.Prado, C. Alves GarciaAndrei, C.Andreou, D.Andrews, H. A.Andronic, A.Anguelov, V.Anson, C.Anticic, T.Antinori, F.Antonioli, R.Aphecetche, L.Appelshauser, H.Arcelli, S.Arnaldi, R.Arnold, O. W.Arsene, I. C.Arslandok, M.Audurier, B.Augustinus, A.Averbeck, R.Azmi, M. D.Badala, A.Baek, Y. W.Bagnasco, S.Bailhache, R.Bala, R.Baldisseri, A.Ball, M.Bara, R. C.Barbano, A. M.Barbera, R.Barile, F.Barioglio, L.Barnafoldi, G. G.Barnby, L. S.Barret, V.Bartalini, P.Barth, K.Bartsch, E.Bastid, N.Basu, S.Batigne, G.Batyunya, B.Batzing, P. C.Alba, J. L. BazoBearden, I. G.Beck, H.Bedda, C.Behera, N. K.Belikov, I.Bellini, F.Martinez, H. BelloBellwied, R.Beltran, L. G. 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DOI
10.1016/j.physletb.2018.02.039
발행일
2018-05-10
유형
Article
저널명
PHYSICS LETTERS B
780
페이지
7 ~ 20