ΔMK and epsilonK in SUSY at the next-to-leading order

Ciuchini, M.; Conti, L.; Donini, A.; Franco, E.; Gimenez, V. Castillo; Giusti, Leonardo; Lubicz, V.; Martinelli, G.; Masiero, A.; Scimemi, Ignazio; Silvestrini, L.; Talevi, M.; Vladikas, A.

doi:10.1088/1126-6708/1998/10/008

Cited by 253 publications

(260 citation statements)

References 19 publications

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“…The comparison of several flavor-changing processes to their experimental values can be used to bound the δ's in the different sectors [104][105][106][107][108][109][110][111][112][113][114][115][116]. In these analyses, it is customary to consider only the dominant contributions due to gluino exchange, which give a good approximation of the full amplitude, barring accidental cancellations.…”

Section: Model-independent Analysis Of Fcnc and Cp Violating Processementioning

confidence: 99%

B, D and K decays

et al. 2008

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With the advent of the LHC, we will be able to probe New Physics (NP) up to energy scales almost one order of magnitude larger than it has been possible with present accelerator facilities. While direct detection of new particles will be the main avenue to establish the presence of NP at the LHC, indirect searches will provide precious complementary information, since most probably it will not be possible to measure the full spectrum of new particles and their couplings through direct production. In particular, precision measurements and computations in the realm of flavor physics are expected to play a key role in constraining the unknown parameters of the Lagrangian of any NP model emerging from direct searches at the LHC.The aim of Working Group 2 was twofold: on the one hand, to provide a coherent up-to-date picture of the status of flavor physics before the start of the LHC; on the other hand, to initiate activities on the path towards integrating information on NP from high-p T and flavor data.This report is organized as follows: in Sect. 1, we give an overview of NP models, focusing on a few examples that have been discussed in some detail during the workshop, with a short description of the available computational tools for flavor observables in NP models. Section 2 contains a concise discussion of the main theoretical problem in flavor physics: the evaluation of the relevant hadronic matrix elements for weak decays. Section 3 contains a detailed discussion of NP effects in a set of flavor observables that we identified as "benchmark channels" for NP searches. The experimental prospects for flavor physics at future facilities are discussed in Sect. 4. Finally, Sect. 5 contains some assessEur. Phys. J. C (2008) 57: 309-492 311 ments on the work done at the workshop and the prospects for future developments.

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Section: Model-independent Analysis Of Fcnc and Cp Violating Processementioning

confidence: 99%

B, D and K decays

et al. 2008

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“…Previous phenomenological analyses of ∆F = 2 processes in supersymmetry [8,9] were affected by a large uncertainty due to the SM contribution, since no determination of the Cabibbo-Kobayashi-Maskawa [10] (CKM) CP-violating phase was available in the presence of NP. A breakthrough was possible with the advent of the B factories and the measurement of time-dependent CP asymmetries in B decays, allowing for a simultaneous determination of the CKM parameters and of the NP contributions to ∆F = 2 processes in the K 0 and B d sectors [11 -13].…”

Section: Introductionmentioning

confidence: 99%

Model-independent constraints on ΔF= 2 operators and the scale of new physics

Bóna¹,

Ciuchini²,

Franco³

et al. 2008

J. High Energy Phys.

451

347

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Froggatt-Nielsen mechanism in a model with SU(3)c×SU(3)L×U (1) Abstract: We update the constraints on new-physics contributions to ∆F = 2 processes from the generalized unitarity triangle analysis, including the most recent experimental developments. Based on these constraints, we derive upper bounds on the coefficients of the most general ∆F = 2 effective Hamiltonian. These upper bounds can be translated into lower bounds on the scale of new physics that contributes to these low-energy effective interactions. We point out that, due to the enhancement in the renormalization group evolution and in the matrix elements, the coefficients of non-standard operators are much more constrained than the coefficient of the operator present in the Standard Model. Therefore, the scale of new physics in models that generate new ∆F = 2 operators, such as next-to-minimal flavour violation, has to be much higher than the scale of minimal flavour violation, and it most probably lies beyond the reach of direct searches at the LHC.

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“…From the single-state matrix elements, the corresponding B-parameters, B can be obtained by studying FCNC processes and, in particular, ∆F = 2 transitions (see [27] and references therein for a discussion). Besides the B-parameters of the operators listed above, such processes also require the knowledge of the B-parameters of the operators…”

Section: /2mentioning

confidence: 99%

“…The above operators transform as members of the (27,1) representation of the SU (3) L ⊗ SU (3) R chiral group. Moreover, the study of the electropenguin contribution to the decay K → ππ involves the computation of the matrix element ππ|O (4) which are also ∆I = 3/2, but transform as an (8,8) representation of the chiral group.…”

Section: Introductionmentioning

confidence: 99%

Non-perturbative renormalization of lattice four-fermion operators without power subtractions

et al. 1999

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A general non-perturbative analysis of the renormalization properties of ∆I = 3/2 four-fermion operators in the framework of lattice regularization with Wilson fermions is presented. We discuss the non-perturbative determination of the operator renormalization constants in the lattice Regularization Independent (RI or MOM) scheme. We also discuss the determination of the finite lattice subtraction coefficients from Ward Identities. We prove that, at large external virtualities, the determination of the lattice mixing coefficients, obtained using the RI renormalization scheme, is equivalent to that based on Ward Identities, in the continuum and chiral limits. As a feasibility study of our method, we compute the mixing matrix at several renormalization scales, for three values of the lattice coupling β, using the Wilson and tree-level improved SW-Clover actions.

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ΔM_K and epsilon_K in SUSY at the next-to-leading order

Cited by 253 publications

References 19 publications

B, D and K decays

B, D and K decays

Model-independent constraints on ΔF= 2 operators and the scale of new physics

Non-perturbative renormalization of lattice four-fermion operators without power subtractions

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