Probing non-standard bb¯h interaction at the LHC at s=13 TeV

Abstract

In the detailed probe of Higgs boson properties at the Large Hadron Collider (LHC), and in looking for new physics signatures in the electroweak symmetry breaking sector, the bottom quark Yukawa coupling has a crucial role. We investigate possible departure from the standard model value of bb¯h coupling, phenomenologically expressed in terms of a modification factor αb, in bb¯-associated production of the 125-GeV scalar at the high-luminosity LHC. In a next-to-leading order estimate, we make use of a gradient boosting algorithm to improve the statistical significance upon a cut-based analysis. It is found possible to probe down to αb=3 with more than 5σ significance, with L=3000 fb−1 and s = 13 TeV, while the achievable limit at 95% C.L. is ±1.95. Scale dependence of this limit is also reported.

Keywords

• Higgs coupling to b
• Large hadron collider
• Gradient boosting