skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Resonant CP violation in Higgs radiation at an e{sup +}e{sup -} linear collider

Abstract

We study resonant CP violation in the Higgsstrahlung process e{sup +}e{sup -}{yields}H{sub 1,2,3}(Z{yields}e{sup +}e{sup -},{mu}{sup +}{mu}{sup -}) and subsequent decays H{sub 1,2,3}{yields}bb,{tau}{sup -}{tau}{sup +}, in the minimal supersymmetric extension of the standard model (MSSM) with Higgs-sector CP violation induced by radiative corrections. At a high-energy e{sup +}e{sup -} linear collider, the recoil-mass method enables one to determine the invariant mass of a fermion pair produced by Higgs decays with a precision as good as 1 GeV. Assuming an integrated luminosity of 100 fb{sup -1}, we show that the production line shape of a coupled system of neutral Higgs bosons decaying into bb quarks is sensitive to the CP-violating parameters. When the Higgs bosons decay into {tau}{sup -}{tau}{sup +}, two CP asymmetries can be defined using the longitudinal and transverse polarizations of the {tau} leptons. Taking into account the constraints from electric dipole moments, we find that these CP asymmetries can be as large as 80%, in a trimixing scenario where all three neutral Higgs states of the MSSM are nearly degenerate and mix significantly.

Authors:
 [1]; ;  [2]
  1. Theory Division, Physics Department, CERN, CH-1211 Geneva 23 (Switzerland)
  2. School of Physics and Astronomy, University of Manchester, Manchester M13 9PL (United Kingdom)
Publication Date:
OSTI Identifier:
20713864
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 72; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.72.095006; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; CP INVARIANCE; ELECTRIC DIPOLE MOMENTS; ELECTRON-POSITRON INTERACTIONS; GEV RANGE; HIGGS BOSONS; HIGGS MODEL; LEPTONIC DECAY; LINEAR COLLIDERS; MUONS MINUS; MUONS PLUS; PAIR PRODUCTION; POLARIZATION; QUARKS; RADIATIVE CORRECTIONS; STANDARD MODEL; SUPERSYMMETRY; TAU PARTICLES; Z NEUTRAL BOSONS

Citation Formats

Ellis, John, Lee, Jae Sik, and Pilaftsis, Apostolos. Resonant CP violation in Higgs radiation at an e{sup +}e{sup -} linear collider. United States: N. p., 2005. Web. doi:10.1103/PhysRevD.72.095006.
Ellis, John, Lee, Jae Sik, & Pilaftsis, Apostolos. Resonant CP violation in Higgs radiation at an e{sup +}e{sup -} linear collider. United States. doi:10.1103/PhysRevD.72.095006.
Ellis, John, Lee, Jae Sik, and Pilaftsis, Apostolos. Tue . "Resonant CP violation in Higgs radiation at an e{sup +}e{sup -} linear collider". United States. doi:10.1103/PhysRevD.72.095006.
@article{osti_20713864,
title = {Resonant CP violation in Higgs radiation at an e{sup +}e{sup -} linear collider},
author = {Ellis, John and Lee, Jae Sik and Pilaftsis, Apostolos},
abstractNote = {We study resonant CP violation in the Higgsstrahlung process e{sup +}e{sup -}{yields}H{sub 1,2,3}(Z{yields}e{sup +}e{sup -},{mu}{sup +}{mu}{sup -}) and subsequent decays H{sub 1,2,3}{yields}bb,{tau}{sup -}{tau}{sup +}, in the minimal supersymmetric extension of the standard model (MSSM) with Higgs-sector CP violation induced by radiative corrections. At a high-energy e{sup +}e{sup -} linear collider, the recoil-mass method enables one to determine the invariant mass of a fermion pair produced by Higgs decays with a precision as good as 1 GeV. Assuming an integrated luminosity of 100 fb{sup -1}, we show that the production line shape of a coupled system of neutral Higgs bosons decaying into bb quarks is sensitive to the CP-violating parameters. When the Higgs bosons decay into {tau}{sup -}{tau}{sup +}, two CP asymmetries can be defined using the longitudinal and transverse polarizations of the {tau} leptons. Taking into account the constraints from electric dipole moments, we find that these CP asymmetries can be as large as 80%, in a trimixing scenario where all three neutral Higgs states of the MSSM are nearly degenerate and mix significantly.},
doi = {10.1103/PhysRevD.72.095006},
journal = {Physical Review. D, Particles Fields},
number = 9,
volume = 72,
place = {United States},
year = {Tue Nov 01 00:00:00 EST 2005},
month = {Tue Nov 01 00:00:00 EST 2005}
}
  • We investigate for two Higgs-doublet models with intrinsic {ital CP} violation in the scalar potential {ital CP}-nonconserving effects in unpolarized {gamma}{gamma}{r_arrow}{ital t{bar t}} for a range of neutral Higgs boson masses which includes resonant {ital cphi} production and the subsequent decay of {ital cphi}{r_arrow}{ital t{bar t}}. The importance of taking into account, even in the resonant case, the interference with the nonresonant background is shown. Further, we propose and calculate three asymmetries which efficiently trace {ital CP}-violating effects in {gamma}{gamma}{r_arrow}{ital t{bar t}} using semileptonic {ital t{bar t}} decays.
  • The sensitivity of data on the process e{sup +}e{sup -} {yields} e{sup +}e{sup -}bb-bar at a future linear electron-positron collider to the deviation of the coupling of the Higgs boson to b quarks from the Standard Model predictions owing to the presence of a pseudoscalar Higgs boson state is analyzed for a collision energy of {radical}(s) = 500 GeV. The admixture of a new hypothetical pseudoscalar Higgs boson state in the Hbb-bar vertex is parametrized in the form m{sub b}/{upsilon}(a + i{gamma}{sub 5}b). On the basis of an analysis of data on the process e{sup +}e{sup -} {yields} e{sup +}e{supmore » -}bb-bar, it is shown that experiments at the future linear collider TESLA will make it possible to constrain the parameters {delta}a = a - 1 and b as -0.056 {<=} {delta}a {<=} 0.055 and -0.32 {<=} b {<=} 0.32, respectively.« less
  • We find a large {ital CP} violation effect within the two-Higgs-doublet model for the reaction {ital e}{sup +}{ital e}{sup {minus}}{r_arrow}{ital t}{bar {ital t}}{ital H}{sup 0} at future linear colliders. The {ital CP} asymmetry arises already at the tree level as a result of interference between diagrams with {ital H}{sup 0} emission from {ital t} (and {bar {ital t}}) and its emission from a {ital Z}{sup 0} and can be about 10{endash}20 {percent}. In the best case one needs a few hundred {ital t{bar t}H}{sup 0} events to observe {ital CP} violation at the 3{sigma} level. {copyright} {ital 1996 The Americanmore » Physical Society.}« less
  • We consider the production of the Higgs boson(s) of both the standard model and the minimal supersymmetric model via the collision of two polarized backscattered laser photons at an [ital e][sup +][ital e[minus]] linear collider. The anticipated photon-photon luminosity should be sufficient to allow detection of any one of these Higgs bosons over a significant range of Higgs boson masses. In particular, the Higgs boson mass reach in the [gamma][gamma] collider mode may be somewhat larger than that of the corresponding [ital e][sup +][ital e[minus]] linear collider. Moreover, [gamma][gamma][r arrow][ital H] will provide a measure of the [gamma][gamma][ital H] couplingmore » which arises at one loop, and therefore is potentially sensitive to all charged particles which gain mass through the Higgs mechanism.« less
  • The complete matrix element for {ital e}{sup +}{ital e}{sup {minus}}{r_arrow}{ital b{bar b}ZZ} has been computed at tree level and applied to {ital ZH}{sup 0} production followed by {ital Z}{r_arrow}{ital b{bar b}} and {ital H}{sup 0}{r_arrow}{ital ZZ}, including all the irreducible background, at the Next Linear Collider. We find that, assuming flavor identification of the {ital Z}-decay products, this channel, together with {ital e}{sup +}{ital e}{sup {minus}}{r_arrow}{ital b{bar b}W}{sup +}{ital W}{sup {minus}} in which {ital ZH}{sup 0}{r_arrow}({ital b{bar b}})({ital W}{sup +}{ital W}{sup {minus}}), can be important for the study of the parameters of the standard model Higgs boson over the heavymore » mass range 2{ital M}{sub {ital Z}}{approx_lt}{ital M}{sub {ital H}}{sup 0}{approx_lt}2{ital m}{sub {ital t}}.« less