<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>B</mml:mi><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mi>s</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:mrow><mml:mn>0</mml:mn></mml:msubsup></mml:math>-mixing matrix elements from lattice QCD for the Standard Model and beyond

Bazavov, A.; Bérnard, C.; Bouchard, C.; Chang, Chia Cheng; DeTar, Carleton; Du, Daping; El-Khadra, A. X.; Freeland, E. D.; Gámiz, E.; Gottlieb, Steven; Heller, Urs M.; Kronfeld, A. S.; Laiho, J.; Mackenzie, Paul B.; Neil, Ethan T.; Simone, J. N.; Sugar, R.; Toussaint, D.; Water, Ruth S. Van de; Zhou, R.

doi:10.1103/physrevd.93.113016

Cited by 181 publications

(331 citation statements)

References 225 publications

(541 reference statements)

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“…Note that the lattice results of ref. [68] have not yet been included in the 2016 FLAG report [69]. They are compatible with the FLAG average [69] but are supposed to be more precise by roughly a factor two.…”

Section: B S − B S Mixingmentioning

confidence: 48%

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Loop effects of heavy new scalars and fermions in b → sμ + μ −

Arnan

Crivellin

Hofer

et al. 2017

J. High Energ. Phys.

127

190

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Recent measurements of b → sµ + µ − processes at LHCb and BELLE have revealed tensions at the 2 − 3 σ level between the Standard Model (SM) prediction and the experimental results in the channels B → K * µ + µ − and B s → φµ + µ − , as well as in the lepton-flavor universality violating observable R K = Br(B → Kµ + µ − )/Br(B → Ke + e − ). Combined global fits to the available b → sµ + µ − data suggest that these tensions might have their common origin in New Physics (NP) beyond the SM because some NP scenarios turn out to be preferred over the SM by 4 − 5 σ. The fact that all these anomalies are related to muons further suggests a connection (and a common NP explanation) with the long-standing anomaly in the anomalous magnetic moment of the muon, a µ . In this article, we study the impact of a generic class of NP models featuring new heavy scalars and fermions that couple to the SM fermions via Yukawa-like interactions. We consider two different scenarios, introducing either one additional fermion and two scalars or two additional fermions and one scalar, and examine all possible representations of the new particles under the SM gauge group with dimension up to the adjoint one. The models induce one-loop contributions to b → sµ + µ − and a µ which are capable of solving the respective anomalies at the 2σ level, albeit a relatively large coupling of the new particles to muons is required. In the case of b → sµ + µ − , stringent constraints from B s − B s mixing arise which can be relaxed if the new fermion is a Majorana particle.

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Section: B S − B S Mixingmentioning

confidence: 48%

“…Bs B Bs from FLAG, including also [68], is not yet available, we directly use ref. [68] for our numerical analysis.…”

Section: B S − B S Mixingmentioning

confidence: 99%

Loop effects of heavy new scalars and fermions in b → sμ + μ −

Arnan

Crivellin

Hofer

et al. 2017

J. High Energ. Phys.

127

190

View full text Add to dashboard Cite

show abstract

“…Allowing for |M Z 12 |/|M SM 12 | 15% [65,66] and setting C NP 9 = −1.07 [41], as favored by the anomalies in B meson decays, we obtain the following upper bound on the Z mass…”

Section: Jhep12(2016)106mentioning

confidence: 99%

Explaining dark matter and B decay anomalies with an L μ − L τ model

Altmannshofer

Gori

Profumo

et al. 2016

J. High Energ. Phys.

184

118

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We present a dark sector model based on gauging the L µ − L τ symmetry that addresses anomalies in b → sµ + µ − decays and that features a particle dark matter candidate. The dark matter particle candidate is a vector-like Dirac fermion coupled to the Z gauge boson of the L µ − L τ symmetry. We compute the dark matter thermal relic density, its pair-annihilation cross section, and the loop-suppressed dark matter-nucleon scattering cross section, and compare our predictions with current and future experimental results. We demonstrate that after taking into account bounds from B s meson oscillations, dark matter direct detection, and the CMB, the model is highly predictive: B physics anomalies and a viable particle dark matter candidate, with a mass of ∼ (5 − 23) GeV, can be accommodated only in a tightly-constrained region of parameter space, with sharp predictions for future experimental tests. The viable region of parameter space expands if the dark matter is allowed to have L µ − L τ charges that are smaller than those of the SM leptons.

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“…2. To get to the level of local operators, which is needed for being able to make a theory prediction, a second operator product expansion is required. The second OPE relies on the smallness 10 During the refereeing process for this review, Fermilab-MILC presented final results in (Bazavov et al, 2016). The numerical effect of these new inputs on mixing observables was studied in (Jubb et al, 2016).…”

Section: Heavy Quark Expansionmentioning

confidence: 99%

“…Setting the bag parameter to one, corresponds to the vacuum insertion approximation. Many lattice evaluations show, that this assumption seems to be very well justified (Bazavov et al, 2016). The remaining matrix elements of the form B 0 s |s α γµ(1 − γ 5 )b α |0 are proportioanl to f Bs pµ, where pµ is the four-momentum of the B 0 s meson.…”

mentioning

confidence: 99%

CP violation in the Bs0 system

2016

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We review experimental and theoretical studies of CP violation in the B 0 s system. Updated predictions for the mixing parameters of the B 0 s mesons expected in the Standard Model (SM) are given, namely the mass difference ∆M SM s = (18.3±2.7) ps −1 , the decay rate difference ∆Γ SM s = (0.085 ± 0.015) ps −1 , and the flavour specific CP asymmetry a s,SM fs = (2.22 ± 0.27) × 10 −5 and the equivalent quantities in the B 0 -sector. Current experimental values of ∆Ms and ∆Γs agree with remarkable precision with theoretical expectations. This agreement supports the applicability of theoretical tools such as the Heavy Quark Expansion (HQE) to these decays. CP violating studies in the B 0 s system provide essential information to test the SM expectations, and to unveil possible contribution of the new physics (NP). NP effects on ∆Ms of the order of 15% are still possible. The CP phase φs due to CP violation in interference of decays and mixing can accommodate effects of the order of O(100%). The semileptonic CP asymmetry a s sl due to CP violation in mixing could still be a factor of 130 larger than its robust SM expectation and thus provides a very clean observable for NP searches. Theoretical improvements that are necessary to make full use of the experimental precision are discussed.

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

Cited by 181 publications

References 225 publications

Loop effects of heavy new scalars and fermions in b → sμ + μ −

Loop effects of heavy new scalars and fermions in b → sμ + μ −

Explaining dark matter and B decay anomalies with an L μ − L τ model

CP violation in the Bs0 system

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