Testing leptoquark/EFT in $${\bar{B}} \rightarrow {D^{(*)}}l{\bar{\nu }}$$ B ¯ → D ( ∗ ) l ν ¯ at the LHC

Autor: Syuhei Iguro, Michihisa Takeuchi, Ryoutaro Watanabe
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: European Physical Journal C: Particles and Fields, Vol 81, Iss 5, Pp 1-14 (2021)
Druh dokumentu: article
ISSN: 1434-6044
1434-6052
DOI: 10.1140/epjc/s10052-021-09125-5
Popis: Abstract We investigate the current LHC bounds on New Physics (NP) that contributes to $${\bar{B}} \rightarrow {D^{(*)}}l{\bar{\nu }}$$ B ¯ → D ( ∗ ) l ν ¯ for $$l = (e,\mu ,\tau )$$ l = ( e , μ , τ ) by considering both leptoquark (LQ) models and an effective-field-theory (EFT) Hamiltonian. Experimental analyses from $$l+\text {missing}$$ l + missing searches with high $$p_T$$ p T are applied to evaluate the NP constraints with respect to the Wilson coefficients. A novel point of this work is to show difference between LQs and EFT for the applicable LHC bound. In particular, we find that the EFT description is not valid to search for LQs with the mass less than $$\lesssim 10\,\text {TeV}$$ ≲ 10 TeV at the LHC and leads to overestimated bounds. We also discuss future prospects of high luminosity LHC searches including the charge asymmetry of background and signal events. Finally, a combined summary for the flavor and LHC bounds is given, and then we see that in several NP scenarios the LHC constraints are comparable with the flavor ones.
Databáze: Directory of Open Access Journals
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