Machine learning the trilinear and light-quark Yukawa couplings from Higgs pair kinematic shapes

Abstract

Revealing the Higgs pair production process is the next big challenge in high energy physics. In this work, we explore the use of interpretable machine learning and cooperative game theory for extraction of the trilinear Higgs self-coupling in Higgs pair production. In particular, we show how a topological decomposition of the gluon-gluon fusion Higgs pair production process can be used to simplify the machine learning analysis flow. Furthermore, we extend the analysis to include $$ q\overline{q} $$ q q ¯ → hh production, which is strongly suppressed in the Standard Model, to extract the trilinear Higgs coupling and to bound large deviations of the light-quark Yukawa couplings from the Standard Model values. The constraints on the rescaling of the trilinear Higgs self-coupling, κλ, and the rescaling of light-quark Yukawa couplings, κu and κd, at HL-LHC (FCC-hh) from single parameter fits are:$$ {\displaystyle \begin{array}{c}{\kappa}_{\lambda }=\left[0.53,1.7\right]\ \left(\left[0.97,1.03\right]\right)\\ {}{\kappa}_u=\left[-470,430\right]\ \left(\left[-58,55\right]\right)\\ {}{\kappa}_d=\left[-360,360\right]\ \left(\left[-26,28\right]\right)\end{array}} $$ κ λ = 0.53 1.7 0.97 1.03 κ u = − 470 430 − 58 55 κ d = − 360 360 − 26 28 We show that the simultaneous modification of the Yukawa couplings can dilute the constraints on the trilinear coupling significantly. We perform similar analyses for FCC-hh. We discuss some motivated flavourful new physics scenarios where such an analysis prevails.

The quark flavor-violating ALPs in light of B mesons and hadron colliders

“…The Shapley value after considering all possible subsets T not containing i, i.e. the payoff of the i-th player, is defined as [115,116]…”

Probing light quark Yukawa couplings through angularity distributions in Higgs boson decay

“…For example, one can measure the light quark Yukawa coupling through i) rare modes of Higgs boson decays, e.g. h → J/Ψγ (ϕγ, ργ, ωγ) [4][5][6]; ii) Higgs production in association with a charmtagged jet [7]; iii) global analysis of the Higgs data [8][9][10][11]; iv) the transverse momentum (p T ) distribution of Higgs boson or jet in Higgs production processes [12][13][14][15][16][17]; v) the kinematic shapes of Higgs pair production [18], off-shell Higgs production [19,20] and triple heavy vector boson production [21]; etc. The above proposals demand accurate calculations of light quark meson formation, charm tagging efficiency and faking rates of light quarks, or precise knowledge of the p T spectrum of Higgs boson.…”