The t-channel Charged Higgs Production in Single Top Events at LHC

TL;DR

This paper investigates the production of charged Higgs bosons via t-channel single top events at the LHC, comparing cross sections with other processes and assessing detection prospects amid background noise.

Contribution

It provides the first detailed calculation of t-channel charged Higgs production cross section and evaluates its detectability at the LHC with high luminosity.

Findings

Signal cross section is much smaller than other production modes.

Signal significance remains low due to background, but high tanbeta values can be excluded.

Charged Higgs masses from 200 to 500 GeV are analyzed for detection prospects.

Abstract

In this paper, the t-channel charged Higgs production at LHC is studied. Production process is a t-channel single top event with charged Higgs exchange. Therefore the signal is similar with Standard Model single top production in terms of the final state. In the first step, the signal cross section is calculated and compared to the other main production processes which are used for a heavy charged Higgs search at LHC, i.e., pp -> tbH- and pp -> H+ -> tb. In the next step, an event generation and analysis is applied on signal and background events, in order to estimate the signal significance. The signal cross section is typically smaller than the associated production (tbH-) and resonance production (tb) by a factor of 10-3 and ranges from 10 fb to 1 fb for charged Higgs mass from 200 to 500 GeV at tanbeta = 50. Due to the small cross section of signal events and large SM background, the signal significance is small even after a dedicated kinematic analysis and selection of events, however, tanbeta values above 120 can be excluded at an integrated luminosity of 3000 fb-1.