Testing the anomaly at the LHeC

Georges Azuelos; Oliver Fischer; Sudip Jana

doi:10.1140/epjc/s10052-021-09936-6

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2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2021) 81: 1123
https://doi.org/10.1140/epjc/s10052-021-09936-6

Regular Article - Theoretical Physics

Testing the $R_{D^{()}}$ $R_{D^{()}}$ anomaly at the LHeC

Georges Azuelos¹^,2, Oliver Fischer³^,4 and Sudip Jana³^c

¹ Université de Montréal, H3C 3J7, Montreal, QC, Canada
² TRIUMF, 4004 Wesbrook Mall, V6T 2A3, Vancouver, BC, Canada
³ Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117, Heidelberg, Germany
⁴ Department of Mathematical Sciences, University of Liverpool, L69 7ZL, Liverpool, UK

^c sudip.jana@mpi-hd.mpg.de

Received: 1 June 2021
Accepted: 13 December 2021
Published online: 22 December 2021

Abstract

B-Physics anomalies have recently raised renewed interest in leptoquarks, predicted in several theoretical frameworks. Under simplifying but conservative assumptions, we show that the current limits from LHC searches together with the requirement to explain the observed value for $R_{D^{(*)}}$ $R_{D^{(*)}}$ constrain the $R_{2}$ $$R_2$$ leptoquark mass to be in the range of $800 \leq m_{R_{2}} \leq 1000$ $800 \le m_{R_2} \le 1000$ GeV. We study the search for $R_{2}$ $$R_2$$ at the LHeC via its resonance in the $b τ$ $b\tau$ final state by performing a cut-and-count analysis of the signal and the dominant Standard Model backgrounds. We find that the LHeC has an excellent discovery potential for the $R_{2}$ $$R_2$$ leptoquark even for couplings to the first generation as small as $O (10^{- 2})$ ${\mathcal {O}}(10^{-2})$ .

© The Author(s) 2021

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