Towards the Identification of New Physics through Quark Flavour Violating Processes

Buras, Andrzej J.; Girrbach, Jennifer

doi:10.48550/arxiv.1306.3775

Cited by 41 publications

(135 citation statements)

References 378 publications

(718 reference statements)

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“…which is the criterion of the allowed NP contribution in ref. [69]. We also estimate the SUSY contribution to ∆M B 0 and ∆M Bs , which are at most 10% of the SM.…”

Section: Figurementioning

confidence: 99%

Probing SUSY with 10 TeV stop mass in rare decays and CP violation of kaon

Tanimoto

Yamamoto

2016

Prog. Theor. Exp. Phys.

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We probe the SUSY at the 10 TeV scale in the rare decays and the CP violation of the kaon. We focus on the processes of K L → π 0 νν and K + → π + νν combined with the CP violating parameters ǫ K and ǫ ′ K /ǫ K . The Z-penguin mediated by the chargino loop cannot enhance K L → π 0 νν and K + → π + νν because the left-right mixing of the stop is constrained by the 125 GeV Higgs mass. On the other hand, the Z-penguin mediated by the gluino loop can enhance the branching ratios of both K L → π 0 νν and K + → π + νν. The former increases up to more than 1.0 × 10 −10 , which is much larger than the SM prediction even if the constraint of ǫ K is imposed. It is remarkable that the Z-penguin mediated by the gluino loop can enhance simultaneously ǫ ′ K /ǫ K and the branching ratio of K L → π 0 νν, which increases up to 1.0 × 10 −10 . We also study the decay rates of K L → µ + µ − , B 0 → µ + µ − and B s → µ + µ − , which correlate with the K L → π 0 νν decay through the Z penguin. It is important to examine the B 0 → µ + µ − process since we expect the enough sensitivity of this decay mode to the SUSY at LHCb.The rare decays and the CP violation of the kaon have given us important constraints for new physics (NP) since the standard model (SM) contributions are suppressed due to the flavor structure of the Cabibbo-Kobayashi-Maskawa (CKM) matrix [1,2]. Typical examples are the rare decay processes K L → π 0 νν and K + → π + νν, which are clean theoretically [3,4]. These processes have been considered to be one of the powerful probes of NP [5]- [17]. In order to improve the previous experimental measurements [18,19], new experiments are going on. One is the J-PARC KOTO experiment, which is to measure the decay rate of K L → π 0 νν approaching to the SM predicted precision [20,21]. Another one is the CERN NA62 experiment to observe the K + → π + νν decay [22].Especially, the K L → π 0 νν process is the CP violating one and provides the direct measurement of the CP violating phase in the CKM matrix. On the other hand, the indirect CP violating parameter ǫ K , which is induced by the K 0 −K 0 mixing, has given us the precise information of the CP violating phase of the CKM matrix. Another CP violating parameter ǫ ′ K /ǫ K was measured in the K → ππ decay. Therefore, the K L → π 0 νν process is expected to open the NP window in the CP violation by combining with ǫ K and ǫ ′ K /ǫ K . The K L → π 0 νν and K + → π + νν decays are dominated by the Z-penguin process, which is the flavor changing neutral current (FCNC) through loop diagrams. The Z-penguin process also gives the large contribution to ǫ ′ K /ǫ K due to the enhancement of the ∆I = 1/2 amplitude [23]. Actually, it cancels the dominant QCD penguin contribution significantly in the SM since it has the opposite sign to the QCD penguin amplitude. On the other hand, ǫ K is given by the box diagram. We expect the deviation from the SM prediction with correlating among K L → π 0 νν, K + → π + νν, ǫ K and ǫ ′ K /ǫ K due to the NP effect. Furthermore, there may be other correlatio...

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“…which is the criterion of the allowed NP contribution in ref. [69]. We also estimate the SUSY contribution to ∆M B 0 and ∆M Bs , which are at most 10% of the SM.…”

Section: Figurementioning

confidence: 99%

Probing SUSY with 10 TeV stop mass in rare decays and CP violation of kaon

Tanimoto

Yamamoto

2016

Prog. Theor. Exp. Phys.

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“…[50,51] on a phenomenological basis, arises actually in extensions of the SM going beyond "minimal flavour violation" (MFV), which are characterised by flavour-universal CP-violating NP phases (for an overview, see Ref. [52]). In this specific class of NP, referred to as non-MFV models, we obtain the following correlation:…”

Section: 3mentioning

confidence: 99%

A Roadmap to Control Penguin Effects in $B^0_d\to J/ψK_{\rm S}^0$ and $B^0_s\to J/ψϕ$

De Bruyn,

Fleischer

2014

Preprint

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Measurements of CP violation in B 0 d → J/ψK 0 S and B 0 s → J/ψφ decays play key roles in testing the quark-flavour sector of the Standard Model. The theoretical interpretation of the corresponding observables is limited by uncertainties from doubly Cabibbo-suppressed penguin topologies. With continuously increasing experimental precision, it is mandatory to get a handle on these contributions, which cannot be calculated reliably in QCD. In the case of the measurement of sin 2β from B 0 d → J/ψK 0 S , the U -spin-related decay B 0 s → J/ψK 0 S offers a tool to control the penguin effects. As the required measurements are not yet available, we use data for decays with similar dynamics and the SU (3) flavour symmetry to constrain the size of the expected penguin corrections. We predict the CP asymmetries of B 0 s → J/ψK 0 S and present a scenario to fully exploit the physics potential of this decay, emphasising also the determination of hadronic parameters and their comparison with theory. In the case of the benchmark mode B 0 s → J/ψφ used to determine the B 0 s -B0 s mixing phase φ s the penguin effects can be controlled through B 0 d → J/ψρ 0 and B 0 s → J/ψK * 0 decays. The LHCb collaboration has recently presented pioneering results on this topic. We analyse their implications and present a roadmap for controlling the penguin effects.

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“…Since then, the nuclear EDM was long thought to be small, and its value has never been seriously questioned. In the mean time, there was a significant development on how to treat the flavor changing CP violation of the CKM matrix in the context of its search in the K and B meson decays, especially in the perturbative treatment of the renormalization group evolution [70][71][72][73][74][75][76][77][78][79][80][81][82][83][84]. There it was argued that the effect of the penguin diagram is sufficiently enhanced in the next-to-leading logarithmic order at low energy scale [73].…”

Section: Introductionmentioning

confidence: 99%

Standard model contribution to the electric dipole moment of the deuteron, 3H, and 3He nuclei

Yamanaka

Hiyama

2016

J. High Energ. Phys.

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We calculate for the first time the electric dipole moment (EDM) of the deuteron, 3 H, and 3 He nuclei generated by the one-meson exchange CP-odd nuclear force in the standard model. The effective |∆S| = 1 four-quark operators are matched to the |∆S| = 1 standard model processes involving the CP phase of the Cabibbo-KobayashiMaskawa matrix at the electroweak scale and run down to the hadronic scale µ = 1 GeV according to the renormalization group evolution in the next-to-leading logarithmic order. At the hadronic scale, the hadron matrix elements are modeled in the factorization approach. We then obtain the one-meson (pion, eta meson, and kaon) exchange CP-odd nuclear force, which is the combination of the |∆S| = 1 meson-baryon vertices which issue from the penguin operator and the hyperon-nucleon transition. From this CP-odd nuclear force, the nuclear EDM is calculated with the realistic Argonne v18 interaction and the CP-odd nuclear force using the Gaussian expansion method. It is found that the EDMs of light nuclear systems are of order O(10 −31 )e cm. We also estimate the standard model contribution to other hadronic CP violating observables such as the EDMs of 6 Li, 9 Be nuclei, and the atomic EDMs of 129 Xe, 199 Hg, 211 Rn, and 225 Ra generated through the nuclear Schiff moment. We then analyze the source of theoretical uncertainties and show some possible ways to overcome them.

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Towards the Identification of New Physics through Quark Flavour Violating Processes

Cited by 41 publications

References 378 publications

Probing SUSY with 10 TeV stop mass in rare decays and CP violation of kaon

Probing SUSY with 10 TeV stop mass in rare decays and CP violation of kaon

A Roadmap to Control Penguin Effects in $B^0_d\to J/ψK_{\rm S}^0$ and $B^0_s\to J/ψϕ$

Standard model contribution to the electric dipole moment of the deuteron, 3H, and 3He nuclei

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