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arXiv · 1801.02579

Unraveling the couplings of a Drell-Yan produced $Z'$ with heavy-flavor tagging

Wei-Shu Hou·Masaya Kohda·Tanmoy Modak
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Abstract

Despite no new physics so far at the LHC, a $Z'$ boson with $m_{Z'} \sim 100$ GeV could still emerge via Drell-Yan (DY) production, $q \bar q \to Z' \to \mu^+ \mu^-$, in the next few years. To unravel the nature of the $Z'$ coupling, we utilize the $c$- and $b$-tagging algorithms developed by ATLAS and CMS to investigate $cg \to c Z'$ at 14 TeV LHC. While light-jet contamination can be eliminated, mistagged $b$-jets cannot be rejected in any of the tagging schemes we adopt. On the other hand, for nonzero $bbZ'$ coupling, far superior $b$-tagging could discover the $bg \to b Z'$ process, where again light-jet mistag can be ruled out, but mistagged $c$-jets cannot yet be excluded. Provided that DY production is discovered soon enough, we find that a simultaneous search for $c g \to c Z'$ and $b g \to b Z'$ can conclusively discern the nature of $Z'$ couplings involved.

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Wei-Shu Hou, Masaya Kohda, Tanmoy Modak. 2018-01-08. Unraveling the couplings of a Drell-Yan produced $Z'$ with heavy-flavor tagging. https://doi.org/10.1103/physrevd.98.015002

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