Taming a leading theoretical uncertainty in HH measurements via accurate simulations for bbH production
JOURNAL OF HIGH ENERGY PHYSICS（2023）
摘要
We present a new simulation for Higgs boson production in association with bottom quarks (bbH) o at next-to-leading order (NLO) accuracy matched to parton showers in hadronic collisions. Both contributions, the standard one proportional to the bottom-quark Yukawa coupling and the loop-induced one proportional to the top-quark Yukawa coupling from the gluon-fusion process, are taken into account in a scheme with massive bottom quarks. Therefore, we provide the full simulation of the bbH final state in the Standard Model, which constitutes also a crucial background to measurements for Higgs-boson pair (HH) production at the Large Hadron Collider when at least one of the Higgs bosons decays to bottom quarks. So far, the modeling of the bbH final state induced one of the dominant theoretical uncertainties to HH measurements, as the gluon-fusion component was described only at the leading order (LO) with uncertainties of O(100%) . Including NLO corrections in its simulation allows us to reduce the scale dependence to O(50%) so that it becomes subdominant with respect to other systematic uncertainties. As a case study, we provide an in-depth analysis of the bbH background to HH measurements with realistic selection cuts in the 2b2 gamma channel. We also compare our novel simulation with the currently-employed ones, discussing possible issues and shortcomings of a scheme with massless bottom quarks. Finally, we propagate the effect of the new bbH simulation to HH searches in the 2b2 gamma and 2b2 tau final states, and we find an improvement of up to 10% (20%) on the current (HL-LHC) limits on sigma(HH)(SM).
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关键词
Bottom Quarks, Higgs Production, Higher-Order Perturbative Calculations
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