Longitudinal asymmetry and its effect on pseudorapidity distributions in Pb-Pb collisions at root s(NN)=2.76 TeV

S. Acharya; J. Adam; D. Adamova; J Adolfsson; MM. Aggarwal; G.A. Rinella; Maria Agnello; N. Agrawal; Z. Ahammed; N. Ahmad; S.U. Ahn; S. Aiola; A. Akindinov; M. Al-Turany; SN Alam; J.L.B. Alba; DSD Albuquerque; D. Aleksandrov; B Alessandro; R. Alfaro-Molina; A. Alici; A. Alkin; J. Alme; T. Alt; Ian Bearden; Ozelin De Lima Pimentel Lais; Christian Alexander Bourjau; Ante Bilandzic; Marek Chojnacki; Jens Jørgen Gaardhøje; Freja Thoresen; Børge Svane Nielsen; bsm989 bsm989; Vojtech Pacik; You Zhou; Katarina Gajdosova; rtc312 rtc312

doi:10.1016/j.physletb.2018.03.051

Longitudinal asymmetry and its effect on pseudorapidity distributions in Pb-Pb collisions at root s(NN)=2.76 TeV

S. Acharya, J. Adam, D. Adamova, J Adolfsson, MM. Aggarwal, G.A. Rinella, Maria Agnello, N. Agrawal, Z. Ahammed, N. Ahmad, S.U. Ahn, S. Aiola, A. Akindinov, M. Al-Turany, SN Alam, J.L.B. Alba, DSD Albuquerque, D. Aleksandrov, B Alessandro, R. Alfaro-MolinaA. Alici, A. Alkin, J. Alme, T. Alt, Ian Bearden, Ozelin De Lima Pimentel Lais, Christian Alexander Bourjau, Ante Bilandzic, Marek Chojnacki, Jens Jørgen Gaardhøje, Freja Thoresen, Børge Svane Nielsen, bsm989 bsm989, Vojtech Pacik, You Zhou, Katarina Gajdosova, rtc312 rtc312

Experimental Particle Physics

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Abstract

First results on the longitudinal asymmetry and its effect on the pseudorapidity distributions in Pb–Pb collisions at s_NN = 2.76 TeV at the Large Hadron Collider are obtained with the ALICE detector. The longitudinal asymmetry arises because of an unequal number of participating nucleons from the two colliding nuclei, and is estimated for each event by measuring the energy in the forward neutron-Zero-Degree-Calorimeters (ZNs). The effect of the longitudinal asymmetry is measured on the pseudorapidity distributions of charged particles in the regions |η|<0.9, 2.8<η<5.1 and −3.7<η<−1.7 by taking the ratio of the pseudorapidity distributions from events corresponding to different regions of asymmetry. The coefficients of a polynomial fit to the ratio characterise the effect of the asymmetry. A Monte Carlo simulation using a Glauber model for the colliding nuclei is tuned to reproduce the spectrum in the ZNs and provides a relation between the measurable longitudinal asymmetry and the shift in the rapidity (y₀) of the participant zone formed by the unequal number of participating nucleons. The dependence of the coefficient of the linear term in the polynomial expansion, c₁, on the mean value of y₀ is investigated.

Original language	English
Journal	Physics Letters B
Volume	781
Pages (from-to)	20-32
Number of pages	12
ISSN	0370-2693
DOIs	https://doi.org/10.1016/j.physletb.2018.03.051
Publication status	Published - 10 Jun 2018

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Acharya, S., Adam, J., Adamova, D., Adolfsson, J., Aggarwal, MM., Rinella, G. A., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, N., Ahn, S. U., Aiola, S., Akindinov, A., Al-Turany, M., Alam, SN., Alba, J. L. B., Albuquerque, DSD., Aleksandrov, D., Alessandro, B., ... rtc312, R. (2018). Longitudinal asymmetry and its effect on pseudorapidity distributions in Pb-Pb collisions at root s(NN)=2.76 TeV. Physics Letters B, 781, 20-32. https://doi.org/10.1016/j.physletb.2018.03.051

Acharya, S, Adam, J, Adamova, D, Adolfsson, J, Aggarwal, MM, Rinella, GA, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, N, Ahn, SU, Aiola, S, Akindinov, A, Al-Turany, M, Alam, SN, Alba, JLB, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Alfaro-Molina, R, Alici, A, Alkin, A, Alme, J, Alt, T, Bearden, I, Lais, ODLP, Bourjau, CA, Bilandzic, A, Chojnacki, M, Gaardhøje, JJ, Thoresen, F, Nielsen, BS , bsm989, B, Pacik, V, Zhou, Y, Gajdosova, K & rtc312, R 2018, 'Longitudinal asymmetry and its effect on pseudorapidity distributions in Pb-Pb collisions at root s(NN)=2.76 TeV', Physics Letters B, vol. 781, pp. 20-32. https://doi.org/10.1016/j.physletb.2018.03.051

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title = "Longitudinal asymmetry and its effect on pseudorapidity distributions in Pb-Pb collisions at root s(NN)=2.76 TeV",

abstract = "First results on the longitudinal asymmetry and its effect on the pseudorapidity distributions in Pb–Pb collisions at sNN = 2.76 TeV at the Large Hadron Collider are obtained with the ALICE detector. The longitudinal asymmetry arises because of an unequal number of participating nucleons from the two colliding nuclei, and is estimated for each event by measuring the energy in the forward neutron-Zero-Degree-Calorimeters (ZNs). The effect of the longitudinal asymmetry is measured on the pseudorapidity distributions of charged particles in the regions |η|<0.9, 2.8<η<5.1 and −3.7<η<−1.7 by taking the ratio of the pseudorapidity distributions from events corresponding to different regions of asymmetry. The coefficients of a polynomial fit to the ratio characterise the effect of the asymmetry. A Monte Carlo simulation using a Glauber model for the colliding nuclei is tuned to reproduce the spectrum in the ZNs and provides a relation between the measurable longitudinal asymmetry and the shift in the rapidity (y0) of the participant zone formed by the unequal number of participating nucleons. The dependence of the coefficient of the linear term in the polynomial expansion, c1, on the mean value of y0 is investigated.",

author = "S. Acharya and J. Adam and D. Adamova and J Adolfsson and MM. Aggarwal and G.A. Rinella and Maria Agnello and N. Agrawal and Z. Ahammed and N. Ahmad and S.U. Ahn and S. Aiola and A. Akindinov and M. Al-Turany and SN Alam and J.L.B. Alba and DSD Albuquerque and D. Aleksandrov and B Alessandro and R. Alfaro-Molina and A. Alici and A. Alkin and J. Alme and T. Alt and Ian Bearden and Lais, {Ozelin De Lima Pimentel} and Bourjau, {Christian Alexander} and Ante Bilandzic and Marek Chojnacki and Gaardh{\o}je, {Jens J{\o}rgen} and Freja Thoresen and Nielsen, {B{\o}rge Svane} and bsm989 bsm989 and Vojtech Pacik and You Zhou and Katarina Gajdosova and rtc312 rtc312",

year = "2018",

month = jun,

day = "10",

doi = "10.1016/j.physletb.2018.03.051",

language = "English",

volume = "781",

pages = "20--32",

journal = "Physics Letters B: Particle Physics, Nuclear Physics and Cosmology",

issn = "0370-2693",

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TY - JOUR

T1 - Longitudinal asymmetry and its effect on pseudorapidity distributions in Pb-Pb collisions at root s(NN)=2.76 TeV

AU - Acharya, S.

AU - Adam, J.

AU - Adamova, D.

AU - Adolfsson, J

AU - Aggarwal, MM.

AU - Rinella, G.A.

AU - Agnello, Maria

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmad, N.

AU - Ahn, S.U.

AU - Aiola, S.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Alam, SN

AU - Alba, J.L.B.

AU - Albuquerque, DSD

AU - Aleksandrov, D.

AU - Alessandro, B

AU - Alfaro-Molina, R.

AU - Alici, A.

AU - Alkin, A.

AU - Alme, J.

AU - Alt, T.

AU - Bearden, Ian

AU - Lais, Ozelin De Lima Pimentel

AU - Bourjau, Christian Alexander

AU - Bilandzic, Ante

AU - Chojnacki, Marek

AU - Gaardhøje, Jens Jørgen

AU - Thoresen, Freja

AU - Nielsen, Børge Svane

AU - bsm989, bsm989

AU - Pacik, Vojtech

AU - Zhou, You

AU - Gajdosova, Katarina

AU - rtc312, rtc312

PY - 2018/6/10

Y1 - 2018/6/10

N2 - First results on the longitudinal asymmetry and its effect on the pseudorapidity distributions in Pb–Pb collisions at sNN = 2.76 TeV at the Large Hadron Collider are obtained with the ALICE detector. The longitudinal asymmetry arises because of an unequal number of participating nucleons from the two colliding nuclei, and is estimated for each event by measuring the energy in the forward neutron-Zero-Degree-Calorimeters (ZNs). The effect of the longitudinal asymmetry is measured on the pseudorapidity distributions of charged particles in the regions |η|<0.9, 2.8<η<5.1 and −3.7<η<−1.7 by taking the ratio of the pseudorapidity distributions from events corresponding to different regions of asymmetry. The coefficients of a polynomial fit to the ratio characterise the effect of the asymmetry. A Monte Carlo simulation using a Glauber model for the colliding nuclei is tuned to reproduce the spectrum in the ZNs and provides a relation between the measurable longitudinal asymmetry and the shift in the rapidity (y0) of the participant zone formed by the unequal number of participating nucleons. The dependence of the coefficient of the linear term in the polynomial expansion, c1, on the mean value of y0 is investigated.

AB - First results on the longitudinal asymmetry and its effect on the pseudorapidity distributions in Pb–Pb collisions at sNN = 2.76 TeV at the Large Hadron Collider are obtained with the ALICE detector. The longitudinal asymmetry arises because of an unequal number of participating nucleons from the two colliding nuclei, and is estimated for each event by measuring the energy in the forward neutron-Zero-Degree-Calorimeters (ZNs). The effect of the longitudinal asymmetry is measured on the pseudorapidity distributions of charged particles in the regions |η|<0.9, 2.8<η<5.1 and −3.7<η<−1.7 by taking the ratio of the pseudorapidity distributions from events corresponding to different regions of asymmetry. The coefficients of a polynomial fit to the ratio characterise the effect of the asymmetry. A Monte Carlo simulation using a Glauber model for the colliding nuclei is tuned to reproduce the spectrum in the ZNs and provides a relation between the measurable longitudinal asymmetry and the shift in the rapidity (y0) of the participant zone formed by the unequal number of participating nucleons. The dependence of the coefficient of the linear term in the polynomial expansion, c1, on the mean value of y0 is investigated.

U2 - 10.1016/j.physletb.2018.03.051

DO - 10.1016/j.physletb.2018.03.051

M3 - Journal article

SN - 0370-2693

VL - 781

SP - 20

EP - 32

JO - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

JF - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

ER -

Longitudinal asymmetry and its effect on pseudorapidity distributions in Pb-Pb collisions at root s(NN)=2.76 TeV

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