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We update the bounds on R-parity violating supersymmetry originating from meson oscillations in the B 0 d/s and K 0 systems. To this end, we explicitly calculate all corresponding contributions from R-parity violating operators at the one-loop level, thereby completing and correcting existing calculations. We apply our results to the derivation of bounds on R-parity violating couplings, based on up-to-date experimental measurements. In addition, we consider the possibility of cancellations among flavor-changing contributions of various origins, e.g. from multiple R-parity violating couplings or Rparity conserving soft terms. Destructive interferences among new-physics contributions could then open phenomenologically allowed regions, for values of the parameters that are naively excluded when the parameters are varied individually.

“…Refs. [54,55,59] presented limits on the corresponding coupling-combinations for a sfermion mass of 100 or 500 GeV. The bounds that we derive are of the same order.…”

Section: -Loop Contributions To Flavor Transitionsupporting

confidence: 54%

Section: -Loop Contributions To Flavor Transitioncontrasting

confidence: 40%

“…Ref. [55]. Here, we wish to illustrate the potential interplay of R p -conserving and RpV flavor violation.…”

Section: Competition Between Flavor Violation In the R-parity Conserv...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Updating bounds on R-parity violating supersymmetry from meson oscillation data

Domingo

Dreiner²,

Kim

et al. 2019

“…The resulting bounds are shown in Table 9.4. Bounds on trilinear R-parity violating couplings from various other studies can be found in [89][90][91][92][93][94][95][96][97][98][99][100]. (2…”

Section: Bounds On the Trilinear Rpv Couplings For Normal Hierarchymentioning

confidence: 99%

Higgs boson mass, neutrino masses and mixing and keV dark matter in an U(1) R − lepton number model

Chakraborty

Roy

2014

We discuss neutrino masses and mixing in the framework of a supersymmetric model with an U(1) R symmetry, consisting of a single right handed neutrino superfield with an appropriate R charge. The lepton number (L) of the standard model fermions are identified with the negative of their R-charges. As a result, a subset of leptonic R-parity violating operators can be present and are consistent with the U(1) R symmetry. This model can produce one light Dirac neutrino mass at the tree level without the need of introducing a very small neutrino Yukawa coupling. We analyze the scalar sector of this model in detail paying special attention to the mass of the lightest Higgs boson. One of the sneutrinos might acquire a substantial vacuum expectation value leading to interesting phenomenological consequences. Different sum rules involving the physical scalar masses are obtained and we show that the lightest Higgs boson mass receives a contribution proportional to the square of the neutrino Yukawa coupling f . This allows for a 125 GeV Higgs boson at the tree level for f ∼ O(1) and still having a small tree level mass for the active neutrino. In order to fit the experimental results involving neutrino masses and mixing angles we introduce a small breaking of U(1) R symmetry, in the context of anomaly mediated supersymmetry breaking. In the presence of this small R-symmetry breaking, light neutrino masses receive contributions at the one-loop level involving the R-parity violating interactions. We also identify the right handed neutrino as a warm dark matter candidate in our model. In the case of R-symmetry breaking, the large f case is characterized by a few hundred MeV lightest neutralino as an unstable lightest supersymmetric particle (LSP) and we briefly discuss the cosmological implications of such a scenario.

Exploring constraints on Simplified Dark Matter model through flavour and electroweak observables

Kolay,

Nandi

2024

This study focuses on a combined analysis of various available inputs to constrain the parameter spaces of a simplified dark matter (SDM) model featuring a spin-0 mediator and fermionic dark matter (DM). The spin-0 mediator interacts with standard model (SM) fermions, SM gauge bosons, and DM. We constrain the parameter spaces of different relevant couplings, DM mass, and the mediator mass, using the data from flavour-changing charged and neutral current processes, CKM matrices, W and Z-pole observables, DM relic density, direct and indirect detection bounds. We have calculated bounds on the couplings from both separate and simultaneous analyses of the mentioned processes. We identify correlated parameter spaces for all the relevant parameters which include the couplings and the masses. For the DM and mediator masses, we have scanned the region between 100 GeV and 1000 GeV. Using our results, we have obtained bounds on the couplings of possible higher dimensional operators from which we can formulate our SDM.