New Lep Constraints on Some Supersymmetric Yukawa Interactions That Violate R-Parity

Bhattacharyya, Gautam; Ellis, John; Sridhar, K.

doi:10.1142/s0217732395001708

Cited by 96 publications

(119 citation statements)

References 10 publications

(15 reference statements)

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“…The last set of limits in Eq. (42) are derived from the leptonic decay modes of the Z [27]. Assuming all the couplings to be positive we find the branching ratio for Υ → BX s to be around 2 × 10 −6 for mν = 100GeV.…”

Section: Nrqcd Matrix Elements Valuementioning

confidence: 93%

Flavor changing processes in quarkonium decays

et al. 1999

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We study flavor changing processes Υ → B/BX s and J/ψ → D/DX u in the B factories and the Tau-Charm factories. In the standard model, these processes are predicted to be unobservable, so they serve as a probe of the new physics. We first perform a model independent analysis, then examine the predictions of models; such as TopColor models, MSSM with R-parity violation and the two Higgs doublet model; for the branching ratios of Υ → B/BX s and J/ψ → D/DX u . We find that these branching ratios could be as large as 10 −6 and 10 −5 in the presence of new physics.

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Section: Nrqcd Matrix Elements Valuementioning

confidence: 93%

Flavor changing processes in quarkonium decays

et al. 1999

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“…The distribution of c will then follow (A.4) for i = 2, 3. We get the invariant mass of a τ jet combined with a lepton, M τ jet l as: 12) where M ab and c are as defined above. In line with the above procedure we introduce the cuts by requiring √ 1 − c > 0.4.…”

Section: Jhep07(2011)070mentioning

confidence: 99%

“…However, alternative symmetries, namely baryon or lepton parities [3][4][5] can also exclude the simultaneous presence of dangerous LQD and UDD couplings [6]. Experimental constraints from the non-observation of modifications to Standard Model rates, or from possible exotic processes [7][8][9][10][11][12][13][14]18] 1 also impose additional limits. Overall, the phenomenology to be expected out of such theories is very rich, since the LSP (Lightest Supersymmetric Particle) is no longer stable and the missing-energy signatures of the MSSM 2 are substituted by multi-lepton or multi-jet events [25,26]; 3 4 single superparticle productions [28][29][30][31] are also possible.…”

Section: Jhep07(2011)070 1 Introductionmentioning

confidence: 99%

Flavour structure of R-violating neutralino decays at the LHC

Bomark

Choudhury

Lola

et al. 2011

J. High Energ. Phys.

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Abstract:We study signatures of R-parity violation in the production of supersymmetric particles at the LHC, and the subsequent decay of the lightest neutralino being the end product of a supersymmetric cascade decay. In doing so, we pay particular attention to the possible flavour structure of the operators, and how one may discriminate between different possibilities. A neutralino LSP would couple to all quarks and leptons and a comparative study of its decays provides an optimal channel for the simultaneous study of all 45 R-violating operators. By studying the expected signals from all these operators, we demonstrate the ability to understand whether more than one coupling dominates, and to map the experimental signatures to operator hierarchies that can then be compared against theoretical models of flavour. Detailed comparisons with backgrounds, including those from MSSM cascade decays are made, using the PYTHIA event simulator.

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“…Although some bounds on the R-violating couplings were derived from R ℓ ≡ Γ(Z → hadrons)/Γ(Z → ℓ + ℓ − ) a few years ago [10], it is necessary to give a thorough examination for the R-violating quantum effects on Zbb and Zℓ + ℓ − couplings since the measurements of both R b ≡ Γ(Z → bb)/Γ(Z → hadrons) and R ℓ have been much improved nowadays [11,12]. Also, when deriving bounds from R b and R ℓ , the R-conserving MSSM quantum effects, which were neglected in previous studies [10], should be included.…”

Section: Introductionmentioning

confidence: 99%

$R_b$ and $R_{\ell}$ in MSSM without R-parity

Yang

2001

Eur. Phys. J. C

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We examined Zℓ + ℓ − and Zbb couplings in the minimal supersymmetric model (MSSM) with explicit R-parity violating interactions. We found the top quark L-violating couplings λ ′ i3k and B-violating couplings λ ′′ 3j3 could give significant contributions through the top quark loops. To accomadate the latest R ℓ data, λ ′ i3k are suject to stringent bounds, some of which can be much stronger than the current bounds. Within the current perturbative unitarity bound of 1.25 for λ ′′ 3j3 , the R b value in R-violating MSSM agrees well with the experimental data at 2σ level, but may lie outside the 1σ range depending on the involved sfermion mass.

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New Lep Constraints on Some Supersymmetric Yukawa Interactions That Violate R-Parity

Cited by 96 publications

References 10 publications

Flavor changing processes in quarkonium decays

Flavor changing processes in quarkonium decays

Flavour structure of R-violating neutralino decays at the LHC

$R_b$ and $R_{\ell}$ in MSSM without R-parity

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