SEMILEPTONIC $\Lambda_b\to\Lambda\nu\bar\nu$ DECAY IN THE LEPTOPHOBIC Z′ MODEL

Şirvanlı, Berrin Belma

doi:10.1142/s0217732308023736

Cited by 14 publications

(8 citation statements)

References 17 publications

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“…[34], the leptonic decays of heavy B(D) meson to a pair of scalar or fermion or vector particles has been investigated both in model independent way and in some popular models. Many new physics models [35][36][37][38][39][40][41][42][43] also have been proposed to test the observed rates of B → M + E decays. Furthermore, the sensitivity of bounds on WIMP-nucleon cross section for GeV scale dark matter in direct detection experiments is less.…”

Section: Introductionmentioning

confidence: 99%

Light dark matter, rare $B$ decays with missing energy in $L_μ-L_τ$ model with a scalar leptoquark

Singirala,

Sahoo,

Mohanta

2021

Preprint

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We investigate the phenomenology of light GeV-scale fermionic dark matter in U (1) Lµ−Lτ gauge extension of the Standard Model. Heavy neutral fermions alongside with a S 1 (3,1,1/3) scalar leptoquark and an inert scalar doublet are added to address the flavor anomalies and light neutrino mass respectively. The light gauge boson associated with U (1) Lµ−Lτ gauge group mediates dark to visible sector and helps to obtain the correct relic density. Aided with a colored scalar, we constrain the new model parameters by using the branching ratios of various b → sll and b → sγ decay processes as well as the lepton flavour non-universality observables R K ( * ) and then show the implication on the branching ratios of some rare semileptonic B → (K ( * ) , φ)+ missing energy, processes.

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Section: Introductionmentioning

confidence: 99%

Light dark matter, rare $B$ decays with missing energy in $L_μ-L_τ$ model with a scalar leptoquark

Singirala,

Sahoo,

Mohanta

2021

Preprint

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“…The economy of these Z models is that they can be accommodate to the SM only by extending the electroweak SM group by an additional U (1) gauge group to which the extra-gauge boson Z is associated. Also, in the grand unification theories (GUTs) such as SU (5) or string inspired E 6 models [91][92][93][94][95], one of the relevant scenarios is the family non-universal Z model [96,97] and the leptophobic Z models [98,99]. The direct signature of an extra Z boson is still missing in the analysis of data taken so far at the LHC [100] experiment, but we already had some indirect constraints on the couplings of Z gauge boson through low energy processes that are crucial and complementary for direct searches Z → e + e − at Tevatron [101].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Angular Observables of $Λ_b \to Λ(\to pπ)μ^{+}μ^{-}$ Decay in Standard and $Z^{\prime}$ Models

Nasrullah,

Aslam,

Shafaq

2018

Preprint

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In 2015, the LHCb collaboration has measured the differential branching ratio dB dq 2 , the lepton-and hadron-side forward-backward asymmetries, denoted by A F B and A Λ F B , respectively in the range 15 < q 2 (= s) < 20 GeV 2 with 3 fb −1 of data. Motivated by these measurements, we perform an analysis of q 2 dependent Λ b → Λ(→ pπ)µ + µ − angular observables at large-and low-recoil in the SM and in a family non-universal Z model. The exclusive Λ b → Λ transition is governed by the form factors and in the present study we use the recently performed high-precision lattice QCD calculations that have well controlled uncertainties especially in 15 < s < 20 GeV 2 bin. Using the full fourfolded angular distribution of Λ b → Λ(→ pπ)µ + µ − decay, first of all we focus on the calculations of experimentally measured dB ds , A F B and A Λ F B in the SM and compare their numerical values with the measurements in appropriate bins of s. In case of the possible discrepancy between the SM prediction and measurements, we try to see if these can be accommodated though the extra neutral Z boson. We find that in the dimuon momentum range 15 < s < 20 GeV 2 the value of dB ds and central value of A F B in Z model is compatible with the measured values. In addition, the fraction of longitudinal polarization of the dimuon F L is measured to be 0.61 +0.11 −0.14 ± 0.03 in 15 < s < 20 GeV 2 at the LHCb. We find that in this bin the value found in the Z model is close to the observed values. After comparing the results of these observables, we have proposed the other observables such as α i and α ( ) i with i = θ , θ Λ , φ, L, U and coefficients of different foldings P 1,••• ,9 in different bins of s in the SM and Z model. We illustrate that the experimental observations of the s-dependent angular observables calculated here in several bins of s can help to test the predictions of the SM and unravel NP contributions arises due to Z model in the Λ b → Λ(→ pπ)µ + µ − decays.

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“…To answer these issues there exists a plethora of the NP models such as the extra dimension models, various supersymmetric models, etc. In grand unification theories such as SU (5) or string-inspired E6 models [1][2][3][4][5], one of the most pertinent is the Z ′ scenarios that include the family non-universal Z ′ [6,7] and leptophobic Z ′ models [8,9].…”

Section: Introductionmentioning

confidence: 99%

Effects of neutral $Z^{\prime}$ boson in $B_{s} \to ϕ\ell^{+} \ell^{-}$ decay with polarized $ϕ$ and the unpolarized and polarized $CP$ violation asymmetry

Ahmed,

Aslam,

Paracha

2014

Preprint

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The effects of new neutral Z ′ boson in Bs → φℓ + ℓ − , when φ is longitudinal or transverse polarized, are studied. In addition, the implications of Z ′ boson on the unpolarized and polarized CP violation asymmetries, with reference to lepton, are also presented. It is observed that the branching ratio with polarized φ are quite sensitive to the Z ′ contributions which are coming through the modification of Wilson coefficients C ef f 9 and C10. Moreover, the off-diagonal elements of the chiral Z ′ couplings contain new weak phase φ sb that provide a new source of CP violation. Keeping in view that in the FCNC transitions the CP violation asymmetries are highly suppressed in the SM, we have studied the unpolarized and polarized CP violation asymmetries in Bs → φℓ + ℓ − decays. Our results indicate that these CP violation asymmetries are remarkably significant and can attribute the any new physics coming through the Z ′ boson. It is hoped that the accurate measurements of these asymmetries will not only help us to establish NP but will also give a chance to determine the precise values of the coupling parameters of the Z ′ boson.

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SEMILEPTONIC $\Lambda_b\to\Lambda\nu\bar\nu$ DECAY IN THE LEPTOPHOBIC Z′ MODEL

Cited by 14 publications

References 17 publications

Light dark matter, rare $B$ decays with missing energy in $L_μ-L_τ$ model with a scalar leptoquark

Light dark matter, rare $B$ decays with missing energy in $L_μ-L_τ$ model with a scalar leptoquark

Analysis of Angular Observables of $Λ_b \to Λ(\to pπ)μ^{+}μ^{-}$ Decay in Standard and $Z^{\prime}$ Models

Effects of neutral $Z^{\prime}$ boson in $B_{s} \to ϕ\ell^{+} \ell^{-}$ decay with polarized $ϕ$ and the unpolarized and polarized $CP$ violation asymmetry

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