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Akeroyd, A. G.; Chen, Chuan Hung; Recksiegel, Stefan

doi:10.1103/physrevd.77.115018

Cited by 30 publications

(51 citation statements)

References 48 publications

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“…LEP data taken at the Z peak constrained a combination of B − u → τν and B − c → τν [12][13][14]. This was first pointed out in [6], and in an earlier work [7] we showed that a signal for the sum of the processes B − u → τν and B − c → τν might be observed if the L3 collaboration (which had the strongest limits [12] from the LEP collaborations) performed the search with their full data sample. A crucial input parameter for the detection prospects of B − c → τν is the transition probability (denoted by f c ) of a b quark hadronising to a B c .…”

Section: Introductionmentioning

confidence: 88%

“…There have been a few works on the potential of the B c meson to probe the presence of new physics particles. In particular the BR of the leptonic decay B − c → τν could be significantly enhanced by a charged Higgs boson (H ± ) [5][6][7] or by supersymmetric particles with specific R-parity violating couplings [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…Building on the analysis of [7], we first obtain a much more precise evaluation of f c from measurements of B c production/decay with the full Tevatron data [15] and from LHC measurements [16][17][18][19]. We then derive a formula for the bound on BR(B − c → τν) from LEP data, which was not obtained in [7]. The bound can be expressed in terms of experimentally determined quantities and just one theoretical input parameter, which is the BR of B − c → J/ψ ν.…”

Section: Introductionmentioning

confidence: 99%

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Constraint on the branching ratio of Bc−→τν¯ from LEP1 data and consequences for

2017

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Recently there has been interest in the correlation between R(D * ) and the branching ratio (BR) of B − c → τν in models with a charged scalar H ± . Any enhancement of R(D * ) by H ± alone (in order to agree with current data) also enhances BR(B − c → τν), for which there has been no direct search at hadron colliders. We show that LEP data taken at the Z peak requires BR(B − c → τν) 10%, and this constraint is significantly stronger than the recent constraint BR(B − c → τν) 30% from considering the lifetime of B c . In order to respect this new constraint, any explanation of the R(D) and R(D * ) anomaly in terms of H ± alone would require the future measurements of R(D * ) to be even closer to the Standard Model prediction. A stronger limit on BR(B − c → τν) (or its first measurement) would be obtained if the L3 collaboration used all its data taken at the Z peak. * Electronic address: a.g.akeroyd@soton.ac.uk † Electronic address:

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Constraint on the branching ratio of Bc−→τν¯ from LEP1 data and consequences for

2017

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“…Moreover, when |V ub | ≈ 3.72×10 −3 is taken from the results of lattice QCD [22] and lightcone sum rules (LCSRs) [67,68], the SM result of BR(B − u → τν) SM ≈ 0.89 × 10 −4 is slightly smaller than the current measurement of BR(B − u → τν) exp = (1.09 ± 0.24) × 10 −4 [69]. In addition to the uncertainties of V ub and B-meson decay constant f B , the difference between the SM prediction and experimental data may raise from new charged current effects [71][72][73][74]. Since theB → D ( * ) τν and B − u → τν processes are associated with the W ± -mediated b → (u, c)τν decays in the SM, in this work, we study the charged-Higgs contributions to the decays in detail in the 2HDM framework.…”

Section: Introductionmentioning

confidence: 96%

Charged Higgs boson contribution to Bq−→ℓν¯ and B
Chen
¹
,
Nomura²
2018
Phys. Rev. D
17
1
24
0
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We comprehensively study the charged-Higgs contributions to the leptonic B − q → ℓν (q = u, c) and semileptonicB → X q ℓν (X u = π, ρ; X c = D, D * ) decays in the type-III two-Higgs-doublet model (2HDM). We employ the Cheng-Sher ansatz to suppress the tree-level flavor-changing neutral currents (FCNCs) in the quark sector. When the strict constraints from the ∆B = 2, b → sγ, and pp(bb) → H/A → τ + τ − processes are considered, parameters χ u tq from the quark couplings and χ ℓ ℓ from the lepton couplings dictate the leptonic and semileptonic B decays. It is found that when the measured B − u → τν and indirect bound of B − c → τν obtained by LEP1 data are taken into account, R(D) and R(π) can have broadly allowed ranges; however, the values of R(ρ) and R(D * ) are limited to approximately the standard model (SM) results. We also find that the same behaviors also occur in the τ -lepton polarizations and forward-backward asymmetries (A Xq,τ F B ) of the semileptonic decays, with the exception of A D * ,τ F B , for which the deviation from the SM due to the charged-Higgs effect is still sizable. In addition, the q 2 -dependent A π,τ F B and A D,τ F B can be very sensitive to the charged-Higgs effects and have completely different shapes from the SM.LHCb reported more than a 2σ deviation from the SM in R(K) = BR(B + → K + µ + µ − )/BR(B + → K + e + e − ) = 0.745 +0.090 −0.074 ± 0.036 [84] and R(K * ) = BR(B 0 → K * 0 µ + µ − )/BR(B 0 → K * 0 e + e − ) = 0.69 +0.11 −0.07 ± 0.05 [85]. Since we concentrate on the treelevel leptonic and semileptonic B decays, we do not address this issue in this work. The charged-Higgs contributions to the b → sℓ + ℓ − processes can be found in [86][87][88][89][90][91].The paper is organized as follows: In Section II, we discuss and parametrize the charged-Higgs Yukawa couplings to the quarks and leptons in the type-III 2HDM. In Section III, we study the charged-Higgs contributions to the leptonic B − u(c) → ℓν andB → (P, V )ℓν decays, where the interesting potential observables include the decay rate, the branching fraction ratio, lepton helicity asymmetry, and lepton forward-backward asymmetry. We study the tree-and loop-induced ∆B = 2 and loop-induced b → sγ processes in Section IV, where the contributions of neutral scalar H, neutral pseudoscalar A, and charged-Higgs are taken into account. The detailed numerical analysis and the current experimental bounds are shown in Section V, and a conclusion is given in Section VI.

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“…Therefore, this process is very sensitive to the charged Higgs boson H ± and provides an important constraint on the model parameters. Within 2HDM, the decay width of this channel reads [32,63,64] …”

Section: B → τ ν Decaymentioning

confidence: 99%

Phenomenological discriminations of the Yukawa interactions in two-Higgs doublet models with $$Z_2$$ Z 2 symmetry

2014

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There are four types of two-Higgs doublet models under a discrete Z 2 symmetry imposed to avoid tree-level flavor-changing neutral current, i.e. type-I, type-II, type-X, and type-Y models. We investigate the possibility to discriminate the four models in the light of the flavor physics data, including B s -B s mixing, B s,d → μ + μ − , B → τ ν and B → X s γ decays, the recent LHC Higgs data, the direct search for charged Higgs at LEP, and the constraints from perturbative unitarity and vacuum stability. After deriving the combined constraints on the Yukawa interaction parameters, we have shown that the correlation between the mass eigenstate rate asymmetry A of B s → μ + μ − and the ratio R = B(B s → μ + μ − ) exp /B(B s → μ + μ − ) SM could be a sensitive probe to discriminate the four models with future precise measurements of the observables in the B s → μ + μ − decay at LHCb.

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MeasuringB±→τ±νandBc±→τ±νat th

Cited by 30 publications

References 48 publications

Constraint on the branching ratio of Bc−→τν¯ from LEP1 data and consequences for

Constraint on the branching ratio of Bc−→τν¯ from LEP1 data and consequences for

Charged Higgs boson contribution to Bq−→ℓν¯ and B
Chen
¹
,
Nomura²
2018
Phys. Rev. D
17
1
24
0
View full text Add to dashboard Cite

Phenomenological discriminations of the Yukawa interactions in two-Higgs doublet models with $$Z_2$$ Z 2 symmetry

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MeasuringB±→τ±νandBc±→τ±νat th

Cited by 30 publications

References 48 publications

Constraint on the branching ratio of Bc−→τν¯ from LEP1 data and consequences for

Constraint on the branching ratio of Bc−→τν¯ from LEP1 data and consequences for

Charged Higgs boson contribution to Bq−→ℓν¯ and BChen1, Nomura2 2018Phys. Rev. D171240View full textAdd to dashboardCite

Phenomenological discriminations of the Yukawa interactions in two-Higgs doublet models with $$Z_2$$ Z 2 symmetry

Contact Info

Product

Resources

About

Charged Higgs boson contribution to Bq−→ℓν¯ and B
Chen
¹
,
Nomura²
2018
Phys. Rev. D
17
1
24
0
View full text Add to dashboard Cite