Centrality dependence of (sic)(2S) suppression in p-Pb collisions at root s(NN)=5.02 TeV

J. Adam; D. Adamova; M.M. Aggarwal; G. Aglieri Rinella; Maria Agnello; N. Agrawal; Z. Ahammed; Shafqat Ahmad; S. U. Ahn; S. Aiola; A. Akindinov; B. Alessandro; Ian Bearden; Hans Bøggild; Christian Holm Christensen; Kristjan Herlache Gulbrandsen; Jens Jørgen Gaardhøje; Hans Hjersing Dalsgaard; Børge Svane Nielsen; Alexander Colliander Hansen; Ante Bilandzic; Marek Chojnacki; Valentina Zaccolo; You Zhou; Christian Alexander Bourjau

doi:10.1007/JHEP06(2016)050

Centrality dependence of (sic)(2S) suppression in p-Pb collisions at root s(NN)=5.02 TeV

J. Adam, D. Adamova, M.M. Aggarwal, G. Aglieri Rinella, Maria Agnello, N. Agrawal, Z. Ahammed, Shafqat Ahmad, S. U. Ahn, S. Aiola, A. Akindinov, B. Alessandro, Ian Bearden, Hans Bøggild, Christian Holm Christensen, Kristjan Herlache Gulbrandsen, Jens Jørgen Gaardhøje, Hans Hjersing Dalsgaard, Børge Svane Nielsen, Alexander Colliander HansenAnte Bilandzic, Marek Chojnacki, Valentina Zaccolo, You Zhou, Christian Alexander Bourjau

Experimental Particle Physics

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Abstract

The inclusive production of the ψ(2S) charmonium state was studied as a function of centrality in p-Pb collisions at the nucleon-nucleon center of mass energy √s_NN = 5.02 TeV at the CERN LHC. The measurement was performed with the ALICE detector in the center of mass rapidity ranges −4.46 < y_cms< −2.96 and 2.03 < y_cms< 3.53, down to zero transverse momentum, by reconstructing the ψ(2S) decay to a muon pair. The ψ(2S) production cross section σ_ψ(2S) is presented as a function of the collision centrality, which is estimated through the energy deposited in forward rapidity calorimeters. The relative strength of nuclear effects on the ψ(2S) and on the corresponding 1S charmonium state J/ψ is then studied by means of the double ratio of cross sections [σ_ψ(2S)/σ_J/ψ]_pPb/[σ_ψ(2S)/σ_J/ψ]_pp between p-Pb and pp collisions, and by the values of the nuclear modification factors for the two charmonium states. The results show a large suppression of ψ(2S) production relative to the J/ψ at backward (negative) rapidity, corresponding to the flight direction of the Pb-nucleus, while at forward (positive) rapidity the suppressions of the two states are comparable. Finally, comparisons to results from lower energy experiments and to available theoretical models are presented.

Original language	English
Article number	050
Journal	Journal of High Energy Physics (Online)
Volume	2016
Issue number	6
ISSN	1126-6708
DOIs	https://doi.org/10.1007/JHEP06(2016)050
Publication status	Published - 1 Jun 2016

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Adam, J., Adamova, D., Aggarwal, M. M., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., U. Ahn, S., Aiola, S., Akindinov, A., Alessandro, B., Bearden, I., Bøggild, H., Christensen, C. H., Gulbrandsen, K. H., Gaardhøje, J. J., Dalsgaard, H. H., Nielsen, B. S., ... Bourjau, C. A. (2016). Centrality dependence of (sic)(2S) suppression in p-Pb collisions at root s(NN)=5.02 TeV. Journal of High Energy Physics (Online), 2016(6), Article 050. https://doi.org/10.1007/JHEP06(2016)050

Adam, J, Adamova, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, U. Ahn, S, Aiola, S, Akindinov, A, Alessandro, B, Bearden, I , Bøggild, H , Christensen, CH , Gulbrandsen, KH , Gaardhøje, JJ, Dalsgaard, HH, Nielsen, BS, Hansen, AC, Bilandzic, A, Chojnacki, M, Zaccolo, V, Zhou, Y & Bourjau, CA 2016, 'Centrality dependence of (sic)(2S) suppression in p-Pb collisions at root s(NN)=5.02 TeV', Journal of High Energy Physics (Online), vol. 2016, no. 6, 050. https://doi.org/10.1007/JHEP06(2016)050

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title = "Centrality dependence of (sic)(2S) suppression in p-Pb collisions at root s(NN)=5.02 TeV",

abstract = "The inclusive production of the ψ(2S) charmonium state was studied as a function of centrality in p-Pb collisions at the nucleon-nucleon center of mass energy √sNN = 5.02 TeV at the CERN LHC. The measurement was performed with the ALICE detector in the center of mass rapidity ranges −4.46 < ycms< −2.96 and 2.03 < ycms< 3.53, down to zero transverse momentum, by reconstructing the ψ(2S) decay to a muon pair. The ψ(2S) production cross section σψ(2S) is presented as a function of the collision centrality, which is estimated through the energy deposited in forward rapidity calorimeters. The relative strength of nuclear effects on the ψ(2S) and on the corresponding 1S charmonium state J/ψ is then studied by means of the double ratio of cross sections [σψ(2S)/σJ/ψ]pPb/[σψ(2S)/σJ/ψ]pp between p-Pb and pp collisions, and by the values of the nuclear modification factors for the two charmonium states. The results show a large suppression of ψ(2S) production relative to the J/ψ at backward (negative) rapidity, corresponding to the flight direction of the Pb-nucleus, while at forward (positive) rapidity the suppressions of the two states are comparable. Finally, comparisons to results from lower energy experiments and to available theoretical models are presented.",

author = "J. Adam and D. Adamova and M.M. Aggarwal and {Aglieri Rinella}, G. and Maria Agnello and N. Agrawal and Z. Ahammed and Shafqat Ahmad and {U. Ahn}, S. and S. Aiola and A. Akindinov and B. Alessandro and Ian Bearden and Hans B{\o}ggild and Christensen, {Christian Holm} and Gulbrandsen, {Kristjan Herlache} and Gaardh{\o}je, {Jens J{\o}rgen} and Dalsgaard, {Hans Hjersing} and Nielsen, {B{\o}rge Svane} and Hansen, {Alexander Colliander} and Ante Bilandzic and Marek Chojnacki and Valentina Zaccolo and You Zhou and Bourjau, {Christian Alexander}",

year = "2016",

month = jun,

day = "1",

doi = "10.1007/JHEP06(2016)050",

language = "English",

volume = "2016",

journal = "Journal of High Energy Physics (Online)",

issn = "1126-6708",

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TY - JOUR

T1 - Centrality dependence of (sic)(2S) suppression in p-Pb collisions at root s(NN)=5.02 TeV

AU - Adam, J.

AU - Adamova, D.

AU - Aggarwal, M.M.

AU - Aglieri Rinella, G.

AU - Agnello, Maria

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmad, Shafqat

AU - U. Ahn, S.

AU - Aiola, S.

AU - Akindinov, A.

AU - Alessandro, B.

AU - Bearden, Ian

AU - Bøggild, Hans

AU - Christensen, Christian Holm

AU - Gulbrandsen, Kristjan Herlache

AU - Gaardhøje, Jens Jørgen

AU - Dalsgaard, Hans Hjersing

AU - Nielsen, Børge Svane

AU - Hansen, Alexander Colliander

AU - Bilandzic, Ante

AU - Chojnacki, Marek

AU - Zaccolo, Valentina

AU - Zhou, You

AU - Bourjau, Christian Alexander

PY - 2016/6/1

Y1 - 2016/6/1

N2 - The inclusive production of the ψ(2S) charmonium state was studied as a function of centrality in p-Pb collisions at the nucleon-nucleon center of mass energy √sNN = 5.02 TeV at the CERN LHC. The measurement was performed with the ALICE detector in the center of mass rapidity ranges −4.46 < ycms< −2.96 and 2.03 < ycms< 3.53, down to zero transverse momentum, by reconstructing the ψ(2S) decay to a muon pair. The ψ(2S) production cross section σψ(2S) is presented as a function of the collision centrality, which is estimated through the energy deposited in forward rapidity calorimeters. The relative strength of nuclear effects on the ψ(2S) and on the corresponding 1S charmonium state J/ψ is then studied by means of the double ratio of cross sections [σψ(2S)/σJ/ψ]pPb/[σψ(2S)/σJ/ψ]pp between p-Pb and pp collisions, and by the values of the nuclear modification factors for the two charmonium states. The results show a large suppression of ψ(2S) production relative to the J/ψ at backward (negative) rapidity, corresponding to the flight direction of the Pb-nucleus, while at forward (positive) rapidity the suppressions of the two states are comparable. Finally, comparisons to results from lower energy experiments and to available theoretical models are presented.

AB - The inclusive production of the ψ(2S) charmonium state was studied as a function of centrality in p-Pb collisions at the nucleon-nucleon center of mass energy √sNN = 5.02 TeV at the CERN LHC. The measurement was performed with the ALICE detector in the center of mass rapidity ranges −4.46 < ycms< −2.96 and 2.03 < ycms< 3.53, down to zero transverse momentum, by reconstructing the ψ(2S) decay to a muon pair. The ψ(2S) production cross section σψ(2S) is presented as a function of the collision centrality, which is estimated through the energy deposited in forward rapidity calorimeters. The relative strength of nuclear effects on the ψ(2S) and on the corresponding 1S charmonium state J/ψ is then studied by means of the double ratio of cross sections [σψ(2S)/σJ/ψ]pPb/[σψ(2S)/σJ/ψ]pp between p-Pb and pp collisions, and by the values of the nuclear modification factors for the two charmonium states. The results show a large suppression of ψ(2S) production relative to the J/ψ at backward (negative) rapidity, corresponding to the flight direction of the Pb-nucleus, while at forward (positive) rapidity the suppressions of the two states are comparable. Finally, comparisons to results from lower energy experiments and to available theoretical models are presented.

U2 - 10.1007/JHEP06(2016)050

DO - 10.1007/JHEP06(2016)050

M3 - Journal article

SN - 1126-6708

VL - 2016

JO - Journal of High Energy Physics (Online)

JF - Journal of High Energy Physics (Online)

IS - 6

M1 - 050

ER -

Centrality dependence of (sic)(2S) suppression in p-Pb collisions at root s(NN)=5.02 TeV

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