Constraints on anomalous color dipole operators from Higgs boson production at the LHC

Abstract

Physics beyond the standard model (SM) can be parameterized with an effective Lagrangian that respects the symmetries of the standard model and contains many operators of dimension six. We consider the subset of these operators that is responsible for flavor diagonal anomalous color magnetic (CMDM) and electric (CEDM) dipole couplings between quarks and gluons. Invariance of these operators under the SM implies that they contribute to Higgs boson production at the LHC and we study the corresponding constraints that can be placed on them. For the case of the top-quark we first review constraints from top-quark pair production and decay, and then compare them to what can be achieved by studying tth production. We also constrain the corresponding couplings for b-quarks and light quarks by studying pp → bbh and pp → hX respectively.

Direct and indirect constraints on CP-violating Higgs-quark and Higgs-gluon interactions

“…[21,30], and the top chromo-EDM (CEDM) has been studied in several papers, see for example refs. [22,23,31]. In this work we focus on the CPV flavor-diagonal couplings arising from eq.…”

“…[31,[90][91][92][93][94] (in connection with modified tth production) and in refs. [22, (in connection with tt pair production and decay).…”

Complete Higgs sector constraints on dimension-6 operators

“…Constraints on these operators have been placed for subsets of operators [80][81][82][83][84][85][86][87][88][89] and in full global fits both before [90] and after [91][92][93] the Higgs discovery. 2 Many strong constraints come from electroweak precision tests (EWPT) [94][95][96] at LEP, and from triplegauge coupling (TGC) [91,92,97] measurements at LEP and the LHC.…”

Boosted Higgs bosons from chromomagneticb’s:bb¯hat high luminosity

“…[16,39,40]), and there is much recent work studying the coupling of the Higgs to third-generation quarks [38,[41][42][43][44][45][46]. However, the b-quark chromomagnetic dipole has only been studied for its modification of the pp → h þ X cross section (where X is another SM parton) [17]. Some work, both pre-and post-Higgs discovery, on the collider bounds on the top-quark chromomagnetic dipole, the cousin of Eq.…”

“…Despite this, alternative Higgs-bottom dynamics are relatively unexplored. Existing work [17] that does incorporate non-Standard Model (SM) hbb dynamics has thus far focused on SM-like (i.e. Yukawa) interactions with non-SM strength, rather than more general kinematic structures.…”