Slight excess at 130 GeV in search for a charged Higgs boson decaying to a charm quark and a bottom quark at the Large Hadron Collider

Akeroyd, A. G.; Moretti, Stefano; Song, Muyuan

doi:10.1088/1361-6471/ac77a6

Cited by 6 publications

(3 citation statements)

References 82 publications

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“…Where our study overlaps the one in ref. [2], we confirm their results. In particular, we confirm that two Higgs doublet models (2HDMs) with NFC cannot explain the signal, while a three-Higgs doublet model (3HDM), where each fermion sector couples to a different Higgs doublet, can do so.…”

Section: Jhep10(2023)078supporting

confidence: 87%

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The flavor of a light charged Higgs

Bernal,

Losada,

Nir

et al. 2023

J. High Energ. Phys.

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The ATLAS Collaboration has recently reported a search for light-charged Higgs in t → H+b decay, with $$ {H}^{+}\to c\overline{b} $$ H + → c b ¯ . An excess with a local significance of approximately 3σ is found at $$ {m}_{H^{+}} $$ m H + ≈ 130 GeV, with a best-fit value of BR(t → H+b) × BR($$ {H}^{+}\to c\overline{b} $$ H + → c b ¯ ) = (1.6 ± 0.6) × 10−3. We study the implications of such a hypothetical signal in multi-Higgs doublet models. We take into account constraints from searches for other charged Higgs decays and from flavor-changing neutral current processes. Two Higgs doublet models with flavor structure dictated by natural flavor conservation (NFC), minimal flavor violation (MFV), or the Froggatt-Nielsen (FN) mechanism cannot account for such excess. A three-Higgs doublet model with NFC can account for the signal. The Yukawa couplings of the neutral pseudoscalar A in the down sector, $$ {\hat{Y}}_A^D $$ Y ̂ A D , should be larger by a factor of 4 – 6 compared to the corresponding Yukawa couplings of the Higgs h, $$ {\hat{Y}}_h^D $$ Y ̂ h D . We further present two minimal scenarios, one in which a single Yukawa coupling in the down sector, $$ {\left({\hat{Y}}_A^D\right)}_{bb} $$ Y ̂ A D bb , gives the only significant contribution, and one in which two Yukawa couplings in the up sector, $$ {\left({\hat{Y}}_A^U\right)}_{tt} $$ Y ̂ A U tt and $$ {\left({\hat{Y}}_A^U\right)}_{tc} $$ Y ̂ A U tc , give the only significant contributions, and we discuss possible tests of these scenarios.

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Section: Jhep10(2023)078supporting

confidence: 87%

“…Some quantitative differences in this context arise because we use updated experimental constraints on the b → sγ decay, which are considerably stronger than the ones used in ref. [2].…”

Section: Jhep10(2023)078mentioning

confidence: 99%

The flavor of a light charged Higgs

Bernal,

Losada,

Nir

et al. 2023

J. High Energ. Phys.

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“…The searches of a light charged Higgs boson at the LHC, namely with mass smaller than difference of the masses of the top quark and the bottom quark, benefit from the large production cross sections of the top quark pair which decays into the charged Higgs boson and a bottom quark. A light charged Higgs boson can undertake several possible decays [10][11][12][13], for instance in the 2HDMs into τ + ν τ , cs, c b, t ( * )b , and W + A if the mass of the CP-odd Higgs boson A is below the threshold. The later two decays can both lead to W + b b final states either directly or via cascade decay of A, which can be dominant over the two-body decays.…”

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confidence: 99%

Signature of a light charged Higgs boson from top quark pairs at the LHC

Hu,

Fu,

Gao

2022

Preprint

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The charged Higgs boson is of great theoretical interests which is predicted in various extensions of the standard model, and has been searched for at various collider experiments. In this paper, we study signatures of a light charged Higgs boson produced from top quark pairs at the LHC, with subsequent three-body decays into a W boson and a pair of bottom quarks. Cross sections on final states of two W bosons plus four bottom quarks have been measured by the ATLAS collaboration at LHC 13 TeV. We reinterpret the experimental data under the scenario of a light charged Higgs boson, and find improved agreements. We obtain the first limit from LHC direct searches on the total branching ratio of the three-body decay, Br(t → H + b)×Br(H + → W + b b), for a charged Higgs boson with mass smaller than the top quark, and the strongest direct constraints on parameter space of a class of type-I two-Higgs-Doublet models.

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Accommodating the LHC charged Higgs boson excess at 130 GeV in the general two-Higgs doublet model

Arhrib,

Krab,

Semlali

2024

J. Phys. G: Nucl. Part. Phys.

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Charged Higgs bosons are common predictions in most extensions of the Standard Model (SM) Higgs sector. Therefore, their observation would elucidate the nature of the Higgs sector. Motivated by the ATLAS collaboration's latest analysis performed with $139~\text{fb}^{-1}$ of Run 2 data intended to search for charged Higgs boson, produced in top quark decay and subsequently decaying via $H^\pm \rightarrow cb$, where an excess with a local significance of $3\sigma$ is observed at $m_{H^\pm} = 130~\rm{GeV}$, we discuss here the possibility of explaining such excess in the context of the general 2-Higgs Doublet Model (2HDM type-III), after satisfying all theoretical and up-to-date experimental constraints. We also propose phenomenological scenarios to further explore the mass region around 130 GeV in the four Yukawa types of the 2HDM type-III and suggest alternative decay channel $H^\pm \rightarrow cs$ and/or $H^\pm \rightarrow W^{\pm *}h$ to probe the nature of the observed excess (if it is not a statistical fluctuation). Future searches for $H^\pm$ will be critical in confirming or refuting the first hint of a light charged Higgs boson at the LHC.

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Slight excess at 130 GeV in search for a charged Higgs boson decaying to a charm quark and a bottom quark at the Large Hadron Collider

Cited by 6 publications

References 82 publications

The flavor of a light charged Higgs

The flavor of a light charged Higgs

Signature of a light charged Higgs boson from top quark pairs at the LHC

Accommodating the LHC charged Higgs boson excess at 130 GeV in the general two-Higgs doublet model

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