CP-violating HWW couplings at the Large Hadron Collider

Abstract

We investigate the possibility of probing an anomalous CP-violating coupling in the HWW vertex at the LHC. We consider the production of the Higgs in association of a W and then decay via the $H\to WW$ channel taking into account the limits on the Higgs production cross section from the Tevatron. We select the same-sign dilepton final state arising from leptonic decays of two of the three Ws and apply cuts required to suppress the standard model background. Several kinematical distributions and asymmetries that can be used to ascertain the presence of a non-zero anomalous coupling are presented. We find that, for Higgs mass in the range 130-150 GeV and anomalous couplings allowed by the Tevatron data, these distributions can be studied with an integrated luminosity of 30-50 fb${}^{-1}$ at the 14 TeV run. Attention is specifically drawn to some asymmetries that enable one to probe the real and imaginary parts (as well as their signs) of the anomalous coupling, in a complementary manner. We also explicitly demonstrate that showering and hadronisation do not affect the utility of these variables, thus affirming the validity of parton level calculations.

14 figures, 2 tables. Some analysis added; conclusions unchanged. Version accepted by Phys. Rev. D

References in corpus (9)

• PYTHIA 6.4 Physics and Manual
• A standard format for Les Houches Event Files
• Anomalous Higgs boson couplings in vector boson fusion at the CERN LHC
• Aspects of CP violation in the HZZ coupling at the LHC
• Role of polarization in probing anomalous gauge interactions of the Higgs boson
• The Tevatron Higgs exclusion limits and theoretical uncertainties: a critical appraisal
• Use of transverse beam polarization to probe anomalous VVH interactions at a Linear Collider
• Anomalous Higgs Couplings at an $e\gamma$ Collider
• Anomalous WWH couplings in gamma gamma collision with initial beams and final state polarizations