For t-channel mediators such as the U1 leptoquark, Drell-Yan EFT bounds are accurate at the 10% level for masses above about 1.5 TeV when the series is truncated at amplitude level, while s-channel mediators need E much smaller than Lambda.
Revisiting mono-$\tau$ tails at the LHC
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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 ${\rm fb}^{-1}$. 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.
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On the EFT validity for Drell-Yan tails at the LHC
For t-channel mediators such as the U1 leptoquark, Drell-Yan EFT bounds are accurate at the 10% level for masses above about 1.5 TeV when the series is truncated at amplitude level, while s-channel mediators need E much smaller than Lambda.