Search for the chiral magnetic effect at the LHC with the CMS experiment
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Dosyalar
Tarih
2019-02
Yazarlar
Dergi Başlığı
Dergi ISSN
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Yayıncı
ELSEVIER
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Searches for the chiral magnetic effect (CME) using charge-dependent azimuthal correlations with respect to event planes are presented in PbPb collisions at 5.02 TeV and pPb collisions at 5.02 and 8.16 TeV, with the CMS experiment at the LHC. The azimuthal correlations with respect to the second- and third-order event planes are explored as a function of pseudorapidity, transverse momentum, and event multiplicity, which provides new insights into the underlying background correlations. By employing an event-shape engineering technique, a linear dependence of charge-dependent correlations on the second-order anisotropy flow (nu(2)) is observed, and the upper limits on the nu(2)-independent fraction, which is directly related to the CME signal, are obtained at 95% confidence level for both pPb and PbPb collisions. These results provide strong constraints on the search for the chiral magnetic effect at LHC energies, and establish new guidelines for searches in future experiments.
Açıklama
Anahtar Kelimeler
CME, Small Systems, Particle Correlation, Event Shape Engineering
Kaynak
NUCLEAR PHYSICS A
WoS Q Değeri
Q3
