Constraining the magnitude of the Chiral Magnetic Effect with Event Shape Engineering in Pb–Pb collisions at sNN=2.76 TeV
(2018) In Physics Letters, Section B: Nuclear, Elementary Particle and HighEnergy Physics 777. p.151162 Abstract
 In ultrarelativistic heavyion collisions, the eventbyevent variation of the elliptic flow v2 reflects fluctuations in the shape of the initial state of the system. This allows to select events with the same centrality but different initial geometry. This selection technique, Event Shape Engineering, has been used in the analysis of chargedependent two and threeparticle correlations in Pb–Pb collisions at sNN=2.76 TeV. The twoparticle correlator 〈cos(φα−φβ)〉 calculated for different combinations of charges α and β is almost independent of v2 (for a given centrality), while the threeparticle correlator 〈cos(φα+φβ−2Ψ2)〉 scales almost linearly both with the event v2 and chargedparticle pseudorapidity density. The charge dependence... (More)
 In ultrarelativistic heavyion collisions, the eventbyevent variation of the elliptic flow v2 reflects fluctuations in the shape of the initial state of the system. This allows to select events with the same centrality but different initial geometry. This selection technique, Event Shape Engineering, has been used in the analysis of chargedependent two and threeparticle correlations in Pb–Pb collisions at sNN=2.76 TeV. The twoparticle correlator 〈cos(φα−φβ)〉 calculated for different combinations of charges α and β is almost independent of v2 (for a given centrality), while the threeparticle correlator 〈cos(φα+φβ−2Ψ2)〉 scales almost linearly both with the event v2 and chargedparticle pseudorapidity density. The charge dependence of the threeparticle correlator is often interpreted as evidence for the Chiral Magnetic Effect (CME), a parity violating effect of the strong interaction. However, its measured dependence on v2 points to a large nonCME contribution to the correlator. Comparing the results with Monte Carlo calculations including a magnetic field due to the spectators, the upper limit of the CME signal contribution to the threeparticle correlator in the 10–50% centrality interval is found to be 26–33% at 95% confidence level. © 2017 The Author(s) (Less)
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 2018
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 Contribution to journal
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 published
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 Physics Letters, Section B: Nuclear, Elementary Particle and HighEnergy Physics
 volume
 777
 pages
 12 pages
 publisher
 Elsevier
 external identifiers

 scopus:85040798759
 ISSN
 03702693
 DOI
 10.1016/j.physletb.2017.12.021
 language
 English
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 9ee2dbfc064e49b4a55e2e3569d61c48
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@article{9ee2dbfc064e49b4a55e2e3569d61c48, abstract = {In ultrarelativistic heavyion collisions, the eventbyevent variation of the elliptic flow v2 reflects fluctuations in the shape of the initial state of the system. This allows to select events with the same centrality but different initial geometry. This selection technique, Event Shape Engineering, has been used in the analysis of chargedependent two and threeparticle correlations in Pb–Pb collisions at sNN=2.76 TeV. The twoparticle correlator 〈cos(φα−φβ)〉 calculated for different combinations of charges α and β is almost independent of v2 (for a given centrality), while the threeparticle correlator 〈cos(φα+φβ−2Ψ2)〉 scales almost linearly both with the event v2 and chargedparticle pseudorapidity density. The charge dependence of the threeparticle correlator is often interpreted as evidence for the Chiral Magnetic Effect (CME), a parity violating effect of the strong interaction. However, its measured dependence on v2 points to a large nonCME contribution to the correlator. Comparing the results with Monte Carlo calculations including a magnetic field due to the spectators, the upper limit of the CME signal contribution to the threeparticle correlator in the 10–50% centrality interval is found to be 26–33% at 95% confidence level. © 2017 The Author(s)}, author = {Acharya, S and Adam, J. 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 Zou, S.}, issn = {03702693}, language = {eng}, pages = {151162}, publisher = {Elsevier}, series = {Physics Letters, Section B: Nuclear, Elementary Particle and HighEnergy Physics}, title = {Constraining the magnitude of the Chiral Magnetic Effect with Event Shape Engineering in Pb–Pb collisions at sNN=2.76 TeV}, url = {http://dx.doi.org/10.1016/j.physletb.2017.12.021}, doi = {10.1016/j.physletb.2017.12.021}, volume = {777}, year = {2018}, }