Constraining a lighter exotic scalar via same-sign top

Constraining a lighter exotic scalar via same-sign top

It was shown recently that, in two Higgs doublet models without Z2 symmetry, extra Yukawa couplings such as ρtc, ρtt can fuel enough CP violation for electroweak baryogenesis (EWBG). We revisit an old proposal where a pseudoscalar A0 has mass between tc¯ and tt¯ thresholds. With ρtt small, it evades...

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Main Authors: Wei-Shu Hou, Masaya Kohda, Tanmoy Modak
Format: Article
Language:English
Published: Elsevier 2018-11-01
Series:Physics Letters B
Online Access:http://www.sciencedirect.com/science/article/pii/S0370269318307470
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spelling doaj-646dc029bbcd439fb87d7e992f181fa52020-11-24T21:42:56ZengElsevierPhysics Letters B0370-26932018-11-01786212216Constraining a lighter exotic scalar via same-sign topWei-Shu Hou0Masaya Kohda1Tanmoy Modak2Department of Physics, National Taiwan University, Taipei 10617, TaiwanDepartment of Physics, National Taiwan University, Taipei 10617, TaiwanCorresponding author.; Department of Physics, National Taiwan University, Taipei 10617, TaiwanIt was shown recently that, in two Higgs doublet models without Z2 symmetry, extra Yukawa couplings such as ρtc, ρtt can fuel enough CP violation for electroweak baryogenesis (EWBG). We revisit an old proposal where a pseudoscalar A0 has mass between tc¯ and tt¯ thresholds. With ρtt small, it evades gg→A0→h0(125)Z constraints, where approximate alignment also helps. We find this scenario with relatively light A0 is not yet ruled out, and cg→tA0→ttc¯ can probe sizable ρtc at the LHC, giving access to the second mechanism of EWBG provided by such models.http://www.sciencedirect.com/science/article/pii/S0370269318307470
collection DOAJ
language English
format Article
sources DOAJ
author Wei-Shu Hou
Masaya Kohda
Tanmoy Modak
spellingShingle Wei-Shu Hou
Masaya Kohda
Tanmoy Modak
Constraining a lighter exotic scalar via same-sign top
Physics Letters B
author_facet Wei-Shu Hou
Masaya Kohda
Tanmoy Modak
author_sort Wei-Shu Hou
title Constraining a lighter exotic scalar via same-sign top
title_short Constraining a lighter exotic scalar via same-sign top
title_full Constraining a lighter exotic scalar via same-sign top
title_fullStr Constraining a lighter exotic scalar via same-sign top
title_full_unstemmed Constraining a lighter exotic scalar via same-sign top
title_sort constraining a lighter exotic scalar via same-sign top
publisher Elsevier
series Physics Letters B
issn 0370-2693
publishDate 2018-11-01
description It was shown recently that, in two Higgs doublet models without Z2 symmetry, extra Yukawa couplings such as ρtc, ρtt can fuel enough CP violation for electroweak baryogenesis (EWBG). We revisit an old proposal where a pseudoscalar A0 has mass between tc¯ and tt¯ thresholds. With ρtt small, it evades gg→A0→h0(125)Z constraints, where approximate alignment also helps. We find this scenario with relatively light A0 is not yet ruled out, and cg→tA0→ttc¯ can probe sizable ρtc at the LHC, giving access to the second mechanism of EWBG provided by such models.
url http://www.sciencedirect.com/science/article/pii/S0370269318307470
work_keys_str_mv AT weishuhou constrainingalighterexoticscalarviasamesigntop
AT masayakohda constrainingalighterexoticscalarviasamesigntop
AT tanmoymodak constrainingalighterexoticscalarviasamesigntop
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