Constraints on Higgs boson production with large transverse momentum using $H\rightarrow b\bar{b}$ decays in the ATLAS detector

TL;DR

This study sets experimental constraints on high transverse momentum Higgs boson production using $b\bar{b}$ decays in the ATLAS detector, providing upper limits that test Standard Model predictions at energies above 450 GeV and 1 TeV.

Contribution

The paper presents the first constraints on Higgs production with transverse momentum above 1 TeV using $b\bar{b}$ decays in the ATLAS detector, employing novel jet reconstruction techniques.

Findings

95% CL upper limit on Higgs production above 450 GeV is 115 fb.

95% CL upper limit on Higgs production above 1 TeV is 9.6 fb.

Standard Model predicts 18.4 fb and 0.13 fb for these regions.

Abstract

This paper reports constraints on Higgs boson production with transverse momentum above 1 TeV. The analyzed data from proton-proton collisions at a center-of-mass energy of 13 TeV were recorded with the ATLAS detector at the Large Hadron Collider from 2015 to 2018 and correspond to an integrated luminosity of 136 fb$^{-1}$. Higgs bosons decaying into $b\bar{b}$ are reconstructed as single large-radius jets recoiling against a hadronic system and identified by the experimental signature of two $b$-hadron decays. The experimental techniques are validated in the same kinematic regime using the $Z\rightarrow b\bar{b}$ process.The 95$\% $ confidence-level upper limit on the cross section for Higgs boson production with transverse momentum above 450 GeV is 115 fb, and above 1 TeV it is 9.6 fb. The Standard Model cross section predictions for a Higgs boson with a mass of 125 GeV in the same kinematic regions are 18.4 fb and 0.13 fb, respectively.