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 - This work was supported in part by the U.S. National Science Foundation and the Ministry of Science and Technology of Taiwan . It was also supported in part by the U.S. Department of Energy , Office of Science, Office of Nuclear Physics under contract DE-AC05-060R23177 .
This work was supported in part by the U.S. National Science Foundation and the Ministry of Science and Technology of Taiwan. It was also supported in part by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-060R23177.
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 - https://www.scopus.com/pages/publications/85071641959
UR - https://www.scopus.com/pages/publications/85071641959#tab=citedBy
U2 - 10.1016/j.physletb.2019.134895
DO - 10.1016/j.physletb.2019.134895
M3 - Article
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 -