Longitudinal asymmetry and its effect on pseudorapidity distributions in Pb–Pb collisions at sNN=2.76 TeV
(2018) In Physics Letters, Section B: Nuclear, Elementary Particle and HighEnergy Physics 781. p.2032 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 neutronZeroDegreeCalorimeters (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... (More)
 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 neutronZeroDegreeCalorimeters (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. © 2018 The Author(s) (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/record/e4dee83e3ff1495392d51e60aa85c074
 author
 organization
 publishing date
 20180610
 type
 Contribution to journal
 publication status
 published
 subject
 in
 Physics Letters, Section B: Nuclear, Elementary Particle and HighEnergy Physics
 volume
 781
 pages
 13 pages
 publisher
 Elsevier
 external identifiers

 scopus:85045043683
 ISSN
 03702693
 DOI
 10.1016/j.physletb.2018.03.051
 language
 English
 LU publication?
 yes
 id
 e4dee83e3ff1495392d51e60aa85c074
 alternative location
 https://www.scopus.com/inward/record.uri?eid=2s2.085045043683&doi=10.1016%2fj.physletb.2018.03.051&partnerID=40&md5=3b111ff894ce747d60c48f25c0658b6d
 date added to LUP
 20180417 12:40:23
 date last changed
 20190220 11:14:28
@article{e4dee83e3ff1495392d51e60aa85c074, 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 neutronZeroDegreeCalorimeters (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. © 2018 The Author(s)}, author = {Acharya, S and Adam, Jaroslav and Adamova, D. and Adolfsson, Jonatan and Aggarwal, M.M and Aglieri Rinella, G and Christiansen, Peter and Oskarsson, Anders and Richert, Tuva and Silvermyr, David and Stenlund, Evert and Vislavicius, Vytautas and , }, issn = {03702693}, language = {eng}, month = {06}, pages = {2032}, publisher = {Elsevier}, series = {Physics Letters, Section B: Nuclear, Elementary Particle and HighEnergy Physics}, title = {Longitudinal asymmetry and its effect on pseudorapidity distributions in Pb–Pb collisions at sNN=2.76 TeV}, url = {http://dx.doi.org/10.1016/j.physletb.2018.03.051}, volume = {781}, year = {2018}, }