Flavor Physics Constraints for Physics Beyond the Standard Model

Isidori, Gino; Nir, Yosef; Pérez, Gilad

doi:10.1146/annurev.nucl.012809.104534

Cited by 333 publications

(352 citation statements)

References 160 publications

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“…To realize this we need only assume that new physics appears at an energy scale Λ in excess of the scale v, crudely that of the W and Z masses. This allows the construction of an effective Lagrangian in terms of operators of mass dimension d with d > 4 [36], where the nonobservation of non-SM invariant operators in flavor physics [2,7,37], allows us to impose SM electroweak gauge invariance in its construction. At leading power in v/Λ, there are then precisely ten dimension-six operators describing the semileptonic decay of the d quark.…”

mentioning

confidence: 99%

Framework for maximum likelihood analysis of neutronβdecay observables to resolve the limits of theV−Alaw

Gardner

Plaster

2013

Phys. Rev. C

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We assess the ability of future neutron β decay measurements of up to O(10 −4 ) precision to falsify the standard model, particularly the V − A law, and to identify the dynamics beyond it. To do this, we employ a maximum likelihood statistical framework which incorporates both experimental and theoretical uncertainties. Using illustrative combined global fits to Monte Carlo pseudodata, we also quantify the importance of experimental measurements of the energy dependence of the angular correlation coefficients as input to such efforts, and we determine the precision to which ill-known "second-class" hadronic matrix elements must be determined in order to exact such tests.

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confidence: 99%

Framework for maximum likelihood analysis of neutronβdecay observables to resolve the limits of theV−Alaw

Gardner

Plaster

2013

Phys. Rev. C

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“…In general in the MSSM, the quark and squark mass matrices are not simultaneously diagonalisable, which leads to flavour violation at tree level. However, stringent limits have been placed on flavour changing neutral currents from K, D and B meson studies setting tight limits on the possible contribution to FCNC from new physics [147][148][149]. In order to explain why flavour violation is so small in the MSSM, the Minimal Flavour Violation (MFV) framework [150][151][152] has been developed.…”

Section: Stop Decay Channelsmentioning

confidence: 99%

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

Thomas¹

2016

Springer Theses

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In this thesis I study the collider phenomenology of BSM physics at the LHC, concentrating on the Higgs boson and supersymmetery. The implications and effects on cross sections of the loss of unitarity in scattering processes involving multiple vector bosons and/or the Higgs, when the Higgs couplings to the W and the Z are non-SM, is studied using an effective Lagrangian. Subsequently methods to remove unwanted background from transversely polarised vector bosons are explored, which enable an estimation of the potential to measure the Higgs couplings to weak bosons in a model-independent way via vector boson fusion. MSSM effects on Higgs production and decay are also considered, concentrating on the effects due to light stops, sbottoms and staus. Amongst other things, we find that light 3 rd generation squarks generally produce asymmetrical alteration in signal strengths of different production channels, generally causing µ V BF µ ggF > 1. Finally we extend some ATLAS analyses in the low ∆m = mt − mχ0 1 region, extending the excluded masses of light stops. This enables us to limit the maximum effects of light stops on the Higgs, and further limits the parameter space where the light stop scenario of electroweak baryogenesis is viable.

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“…We summarize in table 1 the expressions for the matched Wilson coefficients and we derive the bounds on the appropriate combination of vector and axial flavor violating couplings using the results of ref. [104] and g V /m V ≃ 2/TeV following from eq. (2.8).…”

Section: Jhep02(2013)149mentioning

confidence: 99%

Up asymmetries from exhilarated composite flavor structures

Rold

Delaunay

Grojean

et al. 2013

J. High Energ. Phys.

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We present a class of warped extra dimension (composite Higgs) models which conjointly accommodates the tt forward-backward asymmetry observed at the Tevatron and the direct CP asymmetry in singly Cabibbo suppressed D decays first reported by the LHCb collaboration. We argue that both asymmetries, if arising dominantly from new physics beyond the Standard Model, hint for a flavor paradigm within partial compositeness models in which the right-handed quarks of the first two generations are not elementary fields but rather composite objects. We show that this class of models is consistent with current data on flavor and CP violating physics, electroweak precision observables, dijet and top pair resonance searches at hadron colliders. These models have several predictions which will be tested in forthcoming experiments. The CP asymmetry in D decays is induced through an effective operator of the form (ūc) V +A (ss) V +A at the charm scale, which implies a larger CP asymmetry in the D 0 → K + K − rate relative the D 0 → π + π − channel. This prediction is distinctive from other Standard Model or dipole-based new physics interpretation of the LHCb result. CP violation in D−D mixing as well as an an excess of dijet production of the LHC are also predicted to be observed in a near future. A large top asymmetry originates from the exchange of an axial resonance which dominantly produces left-handed top pairs. As a result a negative contribution to the lepton-based forward-backward asymmetry in tt production, as well as O(10%) forward-backward asymmetry in bb production above m bb ≃ 600 GeV at the Tevatron is expected.

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Flavor Physics Constraints for Physics Beyond the Standard Model

Cited by 333 publications

References 160 publications

Framework for maximum likelihood analysis of neutronβdecay observables to resolve the limits of theV−Alaw

Framework for maximum likelihood analysis of neutronβdecay observables to resolve the limits of theV−Alaw

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

Up asymmetries from exhilarated composite flavor structures

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