Revisiting mono-$\tau$ tails at the LHC

Abstract

We revisit the constraints on semileptonic operators derived from the mono-$\tau$ high-$p_T$ events in $pp$ collisions at LHC. Like in previous studies, we obtain limits on the New Physics couplings from the CMS data much stronger than from the ATLAS data, despite a nearly equal integrated luminosity. We find that a neglected systematics on the $\tau$ lepton reconstruction efficiency can partly explain that difference. We then provide new limits on the New Physics couplings relevant to decays based on $b\to c\tau \bar{\nu }$ by using the recent ATLAS data with 139 ${\mathrm{fb}}^{-1}$. We also show that the inclusion of propagation of the New Physics particle can significantly worsen the bounds obtained by relying on Effective Field Theoretical treatment of New Physics.

7 pages, 3 figures

References in corpus (7)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• LHAPDF6: parton density access in the LHC precision era
• Search for lepton-universality violation in $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Confronting lepton flavor universality violation in B decays with high-$p_T$ tau lepton searches at LHC
• On the single leptoquark solutions to the $B$-physics anomalies
• Reading the footprints of the B-meson flavor anomalies

Cited by in corpus (7)

• The Standard Model effective field theory at work
• Drell-Yan Tails Beyond the Standard Model
• HighPT: A Tool for high-$p_T$ Drell-Yan Tails Beyond the Standard Model
• Global fit to $b\to c\tau \nu$ anomalies as of Spring 2024
• On the EFT validity for Drell-Yan tails at the LHC
• $b\to c\tau {\bar{\nu }}_{e,\mu }$ contributions to $R(D^{(\ast )})$
• Explaining the hints for lepton flavour universality violation with three $S_2$ leptoquark generations