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

Title: Top and Higgs flavor changing neutral couplings in two Higgs doublets model

Abstract

We study various channels of top and Higgs flavor changing neutral couplings in the two Higgs doublet model with natural flavor conservation (2HDM-I and 2HDM-II). We update known results about t{yields}c{gamma},cZ,cg and comment on t{yields}ch{sup 0}. The decays t{yields}ch{sup 0} as well as {l_brace}h{sup 0},H{sup 0}{r_brace}{yields}tc are sensitive both to the bottom Yukawa coupling as well as to the trilinear scalar couplings h{sup 0}H{sup +}H{sup -} and H{sup 0}H{sup +}H{sup -}. After imposing unitarity constraints as well as vacuum stability conditions on scalar sector parameters, in 2HDM-II we found that for large tan{beta} > or approx. 40 and rather light charged Higgs mass M{sub H{+-}} > or approx. 150 GeV, the maximum values allowed for Br(t{yields}ch{sup 0}), Br(H{sup 0}{yields}tc), and Br(h{sup 0}{yields}tc) are: 8x10{sup -5}, 10{sup -3}, and 10{sup -4} respectively. For charged Higgs mass in the range [200,300] GeV, which can accommodate B{yields}X{sub s}{gamma} constraint if one takes into account large theoretical uncertainties, the branching ratio of both H{sup 0}{yields}tc and h{sup 0}{yields}tc can still be slightly larger than 10{sup -5}. For A{sup 0}{yields}tc, its branching ratio is smaller than {approx_equal}10{sup -7} in both 2HDM-I and 2HDM-II. We study also the top-charm associated production at e{sup +}e{sup -} collidersmore » and its {gamma}{gamma} option as well as at muon colliders. It is found that the cross section of {gamma}{gamma}{yields}tc can be of the order 0.01{yields}0.1 fb near threshold region, while the cross section of e{sup +}e{sup -}{yields}tc is well below 10{sup -2} fb. The situation is slightly better for muon colliders where a few fb cross section can be reached for large tan{beta} and low center-of-mass energy {radical}(s) < or approx. 500 GeV.« less

Authors:
 [1]
  1. Physics Division, National Center for Theoretical Sciences, P. O. Box 2-131 Hsinchu, Taiwan 300 (China)
Publication Date:
OSTI Identifier:
20713678
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 72; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.72.075016; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BRANCHING RATIO; C QUARKS; FLAVOR MODEL; GEV RANGE; HIGGS BOSONS; HIGGS MODEL; INCLUSIVE INTERACTIONS; INTERMEDIATE BOSONS; MESONS; MUONS; PARTICLE DECAY; REST MASS; SCALARS; T QUARKS; UNIFIED GAUGE MODELS; UNITARITY; UNITARY SYMMETRY; YUKAWA POTENTIAL

Citation Formats

Arhrib, Abdesslam, and Departement de Mathematiques, Faculte des Sciences et Techniques, B.P 416 Tanger. Top and Higgs flavor changing neutral couplings in two Higgs doublets model. United States: N. p., 2005. Web. doi:10.1103/PhysRevD.72.075016.
Arhrib, Abdesslam, & Departement de Mathematiques, Faculte des Sciences et Techniques, B.P 416 Tanger. Top and Higgs flavor changing neutral couplings in two Higgs doublets model. United States. doi:10.1103/PhysRevD.72.075016.
Arhrib, Abdesslam, and Departement de Mathematiques, Faculte des Sciences et Techniques, B.P 416 Tanger. Sat . "Top and Higgs flavor changing neutral couplings in two Higgs doublets model". United States. doi:10.1103/PhysRevD.72.075016.
@article{osti_20713678,
title = {Top and Higgs flavor changing neutral couplings in two Higgs doublets model},
author = {Arhrib, Abdesslam and Departement de Mathematiques, Faculte des Sciences et Techniques, B.P 416 Tanger},
abstractNote = {We study various channels of top and Higgs flavor changing neutral couplings in the two Higgs doublet model with natural flavor conservation (2HDM-I and 2HDM-II). We update known results about t{yields}c{gamma},cZ,cg and comment on t{yields}ch{sup 0}. The decays t{yields}ch{sup 0} as well as {l_brace}h{sup 0},H{sup 0}{r_brace}{yields}tc are sensitive both to the bottom Yukawa coupling as well as to the trilinear scalar couplings h{sup 0}H{sup +}H{sup -} and H{sup 0}H{sup +}H{sup -}. After imposing unitarity constraints as well as vacuum stability conditions on scalar sector parameters, in 2HDM-II we found that for large tan{beta} > or approx. 40 and rather light charged Higgs mass M{sub H{+-}} > or approx. 150 GeV, the maximum values allowed for Br(t{yields}ch{sup 0}), Br(H{sup 0}{yields}tc), and Br(h{sup 0}{yields}tc) are: 8x10{sup -5}, 10{sup -3}, and 10{sup -4} respectively. For charged Higgs mass in the range [200,300] GeV, which can accommodate B{yields}X{sub s}{gamma} constraint if one takes into account large theoretical uncertainties, the branching ratio of both H{sup 0}{yields}tc and h{sup 0}{yields}tc can still be slightly larger than 10{sup -5}. For A{sup 0}{yields}tc, its branching ratio is smaller than {approx_equal}10{sup -7} in both 2HDM-I and 2HDM-II. We study also the top-charm associated production at e{sup +}e{sup -} colliders and its {gamma}{gamma} option as well as at muon colliders. It is found that the cross section of {gamma}{gamma}{yields}tc can be of the order 0.01{yields}0.1 fb near threshold region, while the cross section of e{sup +}e{sup -}{yields}tc is well below 10{sup -2} fb. The situation is slightly better for muon colliders where a few fb cross section can be reached for large tan{beta} and low center-of-mass energy {radical}(s) < or approx. 500 GeV.},
doi = {10.1103/PhysRevD.72.075016},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 7,
volume = 72,
place = {United States},
year = {2005},
month = {10}
}