CP Asymmetries in Higgs decays to ZZ at the LHC
نویسندگان
چکیده
We examine the effect of a general HZZ coupling through a study of the Higgs decay to leptons via Z bosons at the LHC. We discuss various methods for placing limits on additional couplings, including measurement of the partial width, threshold scans, and asymmetries constructed from angular observables. We find that only the asymmetries provide a definitive test of additional couplings. We further estimate the significances they provide.
منابع مشابه
Aspects of CP violation in the HZZ coupling at the LHC
We examine the CP-conserving (CPC) and CP-violating (CPV) effects of a generalHZZ coupling through a study of the processH → ZZ → lll′l′ at the LHC. We construct asymmetries that directly probe these couplings. Further, we present complete analytical formulae for the angular distributions of the decay leptons and for some of the asymmetries. Using these we have been able to identify new observa...
متن کاملDetermination of Spin and CP-Eigenvalue of the Higgs Boson with Atlas
A possibility to prove spin and CP-eigenvalue of a Standard Model (SM) Higgs boson is presented. We exploit angular correlations in the subsequent decay H → ZZ → 4l (muons or electrons). We compare the angular distributions of the leptons originating from the SM Higgs with those resulting from decays of hypothetical particles with differing quantum numbers. This decay channel is the most promis...
متن کاملUdeM-GPP-TH-09-179 CP Violation in Three-Body Chargino Decays
Abstract CP violation in supersymmetry can give rise to rate asymmetries in the decays of supersymmetric particles. In this work we compute the rate asymmetries for the three-body chargino decays χ̃2 → χ̃1 HH, χ̃2 → χ̃1 ZZ, χ̃2 → χ̃1 W+W− and χ̃2 → χ̃1 ZH. Each of the decays contains contributions mediated by neutral Higgs bosons that can possibly go on shell. Such contributions receive a resonant enha...
متن کاملMeasurement of CP Violation in Stop Cascade Decays at the LHC
We study the potential observation at the LHC of CP-violating effects in stop production and subsequent cascade decays, gg → t̃it̃i, t̃i → tχ̃j , χ̃j → χ̃1ll, within the Minimal Supersymmetric Standard Model. We study T-odd asymmetries based on triple products between the different decay products. There may be a large CP asymmetry at the parton level, but there is a significant dilution at the hadron...
متن کاملHeavy MSSM Higgs production at the LHC and decays to WW,ZZ at higher orders
In this paper we discuss the production of a heavy scalar MSSM Higgs boson H and its subsequent decays into pairs of electroweak gauge bosons WW and ZZ. We perform a scan over the relevant MSSM parameters, using constraints from direct Higgs searches and several low-energy observables. We then compare the possible size of the pp → H → WW,ZZ cross sections with corresponding Standard Model cross...
متن کامل