Rare Decays andCPViolation in theBsSystem

Borissov, G.; Fleischer, Robert; Schune, M. H.

doi:10.1146/annurev-nucl-102912-144527

Cited by 43 publications

(11 citation statements)

References 149 publications

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“…where χ f is the C eigenvalue of the hadronic system, tan ψ gives the magnitude of the ratio of right-and left-handed amplitudes and S K * γ = −0.16 ± 0.22 (22) which is consistent with the SM prediction of −0.02 [69]. Measurements of similar coefficients in different final states are somewhat less precise, though the results [121,122].…”

Section: Radiative Decayssupporting

confidence: 60%

Rare b Hadron Decays at the LHC

Blake

Gershon

Hiller

2015

Annu. Rev. Nucl. Part. Sci.

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With the completion of Run I of the CERN Large Hadron Collider, particle physics has entered a new era. The production of unprecedented numbers of heavy-flavoured hadrons in high energy proton-proton collisions allows detailed studies of flavour-changing processes.The increasingly precise measurements allow the Standard Model to be tested to a new level of accuracy. Rare b hadron decays provide some of the most promising approaches for such tests, since there are several observables which can be cleanly interpreted from a theoretical viewpoint. In this article, the status and prospects in this field are reviewed, with a focus on precision measurements and null tests.

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Section: Radiative Decayssupporting

confidence: 60%

Rare b Hadron Decays at the LHC

Blake

Gershon

Hiller

2015

Annu. Rev. Nucl. Part. Sci.

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“…(For recent reviews, see, for example, Refs. [3,4,[31][32][33][34][35][36] and for specific examples, see Refs. [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52].)…”

Section: Introductionmentioning

confidence: 99%

B(s)0-mixing matrix elements from lattice QCD for the Standard Model and beyond

et al. 2016

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We calculate-for the first time in three-flavor lattice QCD-the hadronic matrix elements of all five local operators that contribute to neutral B 0 -and B s -meson mixing in and beyond the Standard Model. We present a complete error budget for each matrix element and also provide the full set of correlations among the matrix elements. We also present the corresponding bag parameters and their correlations, as well as specific combinations of the mixing matrix elements that enter the expression for the neutral B-meson width difference. We obtain the most precise determination to date of the SU(3)-breaking ratio ξ = 1.206(18)(6), where the second error stems from the omission of charm sea quarks, while the first encompasses all other uncertainties. The threefold reduction in total uncertainty, relative to the 2013 Flavor Lattice Averaging Group results, tightens the constraint from B mixing on the Cabibbo-Kobayashi-Maskawa (CKM) unitarity triangle. Our calculation employs gauge-field ensembles generated by the MILC Collaboration with four lattice spacings and pion masses close to the physical value. We use the asqtad-improved staggered action for the light valence quarks, and the Fermilab method for the bottom quark. We use heavy-light meson chiral perturbation theory modified to include lattice-spacing effects to extrapolate the five matrix elements to the physical point. We combine our results with experimental measurements of the neutral B-meson oscillation frequencies to determine the CKM matrix elements |V td | = 8.00(34)(8) × 10 −3 , |V ts | = 39.0(1.2)(0.4) × 10 −3 , and |V td /V ts | = 0.2052(31)(10), which differ from CKM-unitarity expectations by about 2σ. These results and others from flavor-changing-neutral currents point towards an emerging tension between weak processes that are mediated at the loop and tree levels.

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“…For decades, experiments have searched for the B 0 s → µ + µ − decay [2]. It has been a highlight of run 1 of the Large Hadron Collider (LHC) that the B 0 s → µ + µ − mode could eventually be observed in a combined analysis by the CMS and LHCb collaborations [3].…”

Section: Introductionmentioning

confidence: 99%

In pursuit of new physics with B s,d 0 → ℓ + ℓ −

Fleischer

Tetlalmatzi-Xolocotzi

2017

J. High Energ. Phys.

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Abstract:Leptonic rare decays of B 0 s,d mesons offer a powerful tool to search for physics beyond the Standard Model. The B 0 s → µ + µ − decay has been observed at the Large Hadron Collider and the first measurement of the effective lifetime of this channel was presented, in accordance with the Standard Model. On the other hand, B 0 s → τ + τ − and B 0 s → e + e − have received considerably less attention: while LHCb has recently reported a first upper limit of 6.8 × 10 −3 (95% C.L.) for the B 0 s → τ + τ − branching ratio, the upper bound 2.8 × 10 −7 (90% C.L.) for the branching ratio of B 0 s → e + e − was reported by CDF back in 2009. We discuss the current status of the interpretation of the measurement of B 0 s → µ + µ − , and explore the space for New-Physics effects in the other B 0 s,d → + − decays in a scenario assuming flavour-universal Wilson coefficients of the relevant fourfermion operators. While the New-Physics effects are then strongly suppressed by the ratio m µ /m τ of the lepton masses in B 0 s → τ + τ − , they are hugely enhanced by m µ /m e in B 0 s → e + e − and may result in a B 0 s → e + e − branching ratio as large as about 5 times the one of B 0 s → µ + µ − , which is about a factor of 20 below the CDF bound; a similar feature arises in B 0 d → e + e − . Consequently, it would be most interesting to search for the B 0 s,d → e + e − channels at the LHC and Belle II, which may result in an unambiguous signal for physics beyond the Standard Model.

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Rare Decays andCPViolation in theB_sSystem

Cited by 43 publications

References 149 publications

Rare b Hadron Decays at the LHC

Rare b Hadron Decays at the LHC

B(s)0-mixing matrix elements from lattice QCD for the Standard Model and beyond

In pursuit of new physics with B s,d 0 → ℓ + ℓ −

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