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Title: Lightest Higgs boson and relic neutralino in the MSSM with CP violation

Abstract

We discuss the lower bound to the lightest Higgs boson H{sub 1} in the minimal supersymmetric extension of the standard model with explicit CP violation, and the phenomenology of the lightest relic neutralino in the same scenario. In particular, adopting the CPX benchmark scenario, we find that the combination of experimental constraints coming from LEP, thallium electric dipole moment measurements, quarkonium decays, and B{sub s}{yields}{mu}{mu} decay favors a region of the parameter space where the mass of H{sub 1} is in the range 7 GeV < or approx. M{sub H{sub 1}} < or approx. 10 GeV, while 3 < or approx. tan{beta} < or approx. 5. Assuming a departure from the usual grand unified theory relation among gaugino masses (|M{sub 1}|<<|M{sub 2}|), we find that through resonant annihilation to H{sub 1} a neutralino as light as 2.9 GeV can be a viable dark matter candidate in this scenario. We call this the CPX light neutralino scenario and discuss its phenomenology showing that indirect dark matter searches are compatible with the present experimental constraints, as long as m{sub {chi}}< or approx. M{sub H{sub 1/2}}. On the other hand, part of the range m{sub {chi}} > or approx. M{sub H{sub 1/2}} whichmore » is allowed by cosmology is excluded by antiproton fluxes.« less

Authors:
 [1];  [2]
  1. Center of Theoretical Physics, School of Physics, Seoul National University, Seoul, 151-747 (Korea, Republic of)
  2. Korea Institute for Advanced Study, Seoul 130-722 (Korea, Republic of)
Publication Date:
OSTI Identifier:
21020295
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.75.075001; (c) 2007 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; ANNIHILATION; ANTIPROTONS; B S MESONS; BENCHMARKS; COSMOLOGY; CP INVARIANCE; ELECTRIC DIPOLE MOMENTS; GEV RANGE; HIGGS BOSONS; LEP STORAGE RINGS; MUONS; NONLUMINOUS MATTER; PARTICLE DECAY; QUARKONIUM; REST MASS; SPARTICLES; STANDARD MODEL; SUPERSYMMETRY

Citation Formats

Lee, Jae Sik, and Scopel, Stefano. Lightest Higgs boson and relic neutralino in the MSSM with CP violation. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.075001.
Lee, Jae Sik, & Scopel, Stefano. Lightest Higgs boson and relic neutralino in the MSSM with CP violation. United States. doi:10.1103/PHYSREVD.75.075001.
Lee, Jae Sik, and Scopel, Stefano. Sun . "Lightest Higgs boson and relic neutralino in the MSSM with CP violation". United States. doi:10.1103/PHYSREVD.75.075001.
@article{osti_21020295,
title = {Lightest Higgs boson and relic neutralino in the MSSM with CP violation},
author = {Lee, Jae Sik and Scopel, Stefano},
abstractNote = {We discuss the lower bound to the lightest Higgs boson H{sub 1} in the minimal supersymmetric extension of the standard model with explicit CP violation, and the phenomenology of the lightest relic neutralino in the same scenario. In particular, adopting the CPX benchmark scenario, we find that the combination of experimental constraints coming from LEP, thallium electric dipole moment measurements, quarkonium decays, and B{sub s}{yields}{mu}{mu} decay favors a region of the parameter space where the mass of H{sub 1} is in the range 7 GeV < or approx. M{sub H{sub 1}} < or approx. 10 GeV, while 3 < or approx. tan{beta} < or approx. 5. Assuming a departure from the usual grand unified theory relation among gaugino masses (|M{sub 1}|<<|M{sub 2}|), we find that through resonant annihilation to H{sub 1} a neutralino as light as 2.9 GeV can be a viable dark matter candidate in this scenario. We call this the CPX light neutralino scenario and discuss its phenomenology showing that indirect dark matter searches are compatible with the present experimental constraints, as long as m{sub {chi}}< or approx. M{sub H{sub 1/2}}. On the other hand, part of the range m{sub {chi}} > or approx. M{sub H{sub 1/2}} which is allowed by cosmology is excluded by antiproton fluxes.},
doi = {10.1103/PHYSREVD.75.075001},
journal = {Physical Review. D, Particles Fields},
number = 7,
volume = 75,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}
  • We calculate the relic density of dark matter in the MSSM with CP violation. We analyze various scenarios of neutralino annihilation: the cases of a b-ino, b-ino-W-ino and b-ino-Higgsino LSP, annihilation through Higgs, as well as sfermion coannihilation scenarios. Large phase effects are found--on the one hand, due to shifts in the masses; on the other hand, due to modifications of the couplings. Taking special care to disentangle the effects in masses and couplings, we demonstrate that the presence of CP phases can have a significant influence on the neutralino relic abundance. Typical variations in {omega}h{sup 2} solely from modificationsmore » in the couplings are O (10%-100%), but can reach an order of magnitude in some cases.« less
  • We analyze the Tevatron and Large Hadron Collider (LHC) reach for the Higgs sector of the minimal supersymmetric standard model (MSSM) in the presence of explicit CP violation. Using the most recent studies from the Tevatron and LHC collaborations, we examine the CPX benchmark scenario for a range of CP-violating phases in the soft trilinear and gluino mass terms and compute the exclusion/discovery potentials for each collider on the (M{sub H}{sup +},tan{beta}) plane. Projected results from standard model (SM)-like, nonstandard, and charged Higgs searches are combined to maximize the statistical significance. We exhibit complementarity between the SM-like Higgs searches atmore » the LHC with low luminosity and the Tevatron, and estimate the combined reach of the two colliders in the early phase of LHC running.« less
  • We discuss ILC measurements for a specific MSSM scenario with CP phases, where the lightest neutralino is a good candidate for dark matter, annihilating efficiently through t-channel exchange of light staus. These prospective (CP-even) ILC measurements are then used to fit the underlying model parameters. A collider prediction of the relic density of the neutralino from this fit gives 0.116<{omega}h{sup 2}<0.19 at 95% C.L. CP-odd observables, while being a direct signal of CP violation, do not help in further constraining {omega}h{sup 2}. The interplay with (in)direct detection of dark matter and with measurements of electric dipole moments is also discussed.more » Finally we comment on collider measurements at higher energies for refining the prediction of {omega}h{sup 2}.« less