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Title Lepton Angular Distribution of Z boson production and jet discrimination
Authors Randall McClellan,Jen-chieh Peng,Wen-Chen Chang,Oleg Teryaev
JLAB number JLAB-THY-19-2985
LANL number arXiv:1907.10483
Other number DOE/OR/23177-4744
Document Type(s) (Journal Article) 
Supported by U.S. Naval Research: No
Supported by Jefferson Lab LDRD Funding: Yes
LDRD Numbers: 2019-LDRD-13
Funding Source: Nuclear Physics (NP)
Other Funding:U.S. National Science Foundation
Ministry of Science and Technology of Taiwan

Compiled for Physics Letters B
Volume 797
Page(s) 134895
Publication Abstract: 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 that what has been observed so far for inclusive Z production data. These predictions can be readily tested using existing LHC data.
Experiment Numbers: other
Document: pdf
Accepted Manuscript: 1-s2.0-S0370269319306094-main.pdf
Supporting Documents:
Supporting Datasets: