TY - JOUR
T1 - Lepton angular distribution of Z boson production and jet discrimination
AU - Peng, Jen Chieh
AU - Chang, Wen Chen
AU - McClellan, Randall Evan
AU - Teryaev, Oleg
N1 - Publisher Copyright:
© 2019 The Authors
PY - 2019/10/10
Y1 - 2019/10/10
N2 - High precision data of lepton angular distributions in inclusive Z boson production, reported by the CMS and ATLAS Collaborations, showed pronounced transverse momentum (qT) dependencies of the A0 and A2 coefficients. Violation of the Lam-Tung relation, A0=A2, was also found. An intuitive understanding of these results can be obtained from a geometric approach. We predict that A0 and A2 for Z plus single gluon-jet events are very different from that of Z plus single quark-jet events, allowing a new experimental tool for checking various algorithms which attempt to discriminate quark jets from gluon jets. We also predict that the Lam-Tung relation would be more severely violated for the Z plus multiple-jet data than what has been observed so far for inclusive Z production data. These predictions can be readily tested using existing LHC data.
AB - High precision data of lepton angular distributions in inclusive Z boson production, reported by the CMS and ATLAS Collaborations, showed pronounced transverse momentum (qT) dependencies of the A0 and A2 coefficients. Violation of the Lam-Tung relation, A0=A2, was also found. An intuitive understanding of these results can be obtained from a geometric approach. We predict that A0 and A2 for Z plus single gluon-jet events are very different from that of Z plus single quark-jet events, allowing a new experimental tool for checking various algorithms which attempt to discriminate quark jets from gluon jets. We also predict that the Lam-Tung relation would be more severely violated for the Z plus multiple-jet data than what has been observed so far for inclusive Z production data. These predictions can be readily tested using existing LHC data.
KW - Jet discrimination
KW - Z decay angular distribution
KW - Z-boson production
UR - http://www.scopus.com/inward/record.url?scp=85071641959&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2019.134895
DO - 10.1016/j.physletb.2019.134895
M3 - 期刊論文
AN - SCOPUS:85071641959
SN - 0370-2693
VL - 797
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
M1 - 134895
ER -