The relic abundance of the lightest right-handed sneutrino dark matter in supersymmetric B−L extension of the standard model is revisited. Through the exchange of light B−L Higgs bosons, we investigate the bound state of the attractive Yukawa potential and obtain a large non-perturbative Sommerfeld enhancement effect. We emphasize that with this effect the relic abundance of right-handed sneutrino will lie within the observational limits and the right-handed sneutrino will remain a viable dark matter up to a mass of order 1.5 TeV.

The detection of a heavy neutral CP-even Higgs boson of the B-L Supersymmetric Standard Model (BLSSM), h' , with m_h'≃ 400 GeV , at the Large Hadron Collider (LHC) for a center-of-mass energy of √(s)=14 TeV , is investigated. The following production and decay channels are considered: gg→ h'→ZZ→ 4ℓ and (with being the Missing Transverse Energy (MET)), where ℓ =e,μ , with integrated luminosity L_int=300 fb^-1 (Run 3). Furthermore, we also look into the di-Higgs channel gg→ h'→hh→bb̅γγ at the High-Luminosity LHC (HL-LHC) with an integrated luminosity of L_int=3000 fb^-1 . We demonstrate that promising signals with high signal-to-background statistical significance ( S/√(B) ) can be obtained through the three aforementioned channels.

We investigate the RD and R_D^∗ anomalies in the context of non-minimal SU(5), where Higgs sector is extended by adjoint 45-dimensional multiplet. One of the light spectrum of this model could be the scalar triplet leptoquark that is contained in this multiplet. We demonstrate that this particular scalar leptogquark mediation of the transition b → cτν is capable of simultaneously accounting for both RD and R_D^∗ anomalies. We further emphasize that another Yukawa coupling controls its contribution to b → sℓ+ℓ−, ensuring that RK and R_K^∗ remain consistent with the standard model predictions.

We investigate the possibility of explanation for the muon anomalous magnetic moment g mu - 2 in a left-right model with an inverse seesaw mechanism. We emphasize that the observed deviation from the Standard Model predictions can be accommodated in a large part of the parameter space of this class of models, where loops with massive neutrinos and charged Higgs boson as well as the weak W boson contribute significantly to g mu - 2. Stringent constraints due to lepton flavor violation mu -> e gamma, mu-e conversion and the electron anomalous magnetic moment ge - 2 are considered, and the results are compatible.

We investigate R-D and R-D* anomalies in a low scale left-right symmetric model based on SU(3)(C) x SU(2)(L) x SU(2)(R) x U(1)(B-L) with a simplified Higgs sector consisting of only one bidoublet and one SU(2)(R) doublet. The Wilson coefficients relevant to the transition b -> c tau nu are derived by integrating out the charged Higgs H-+/- boson, which gives the dominant contributions. We emphasize that the charged Higgs effects, with the complex right-handed quark mixing matrix, can account for both R-D and R-D* anomalies simultaneously, while adhering to a set of significant constraints including, for instance, BR(B-c(-) -> tau(-)(nu) over bar (tau)) and B-s(d) - (B) over bar (s(d)) mixing. In relation to this, we show that the predicted values of the D-*, tau longitudinal polarizations and P-tau (D) can be affected for the set of the parameters of the model resolving the R-D,R-D* anomalies.

Gram-negative bacteria were collected from different clinical labs situated in Karachi. Of these 83 isolates, 99% were found resistant against one or more of the following antibiotics: ampicillin, co-amoxiclav, gentamycin, neomycin, streptomycin and tetracycline. Most of the isolates were multi-drug resistant (MDR) having resistance to three or more antibiotics at a time. For ampicillin, 4.8% of the isolates were found Susceptible, 3.6% were Intermediate while 91.5% were found Resistant. For co-amoxiclav, 1.2% of the isolates were found Susceptible, 6% were Intermediate while 92.7% were found Resistant. For gentamicin, 3.6% of the isolates were found Susceptible, 10.8% were Intermediate while 86.7% were found Resistant. For neomycin, 21.6% of the isolates were found Susceptible, 40.9% were Intermediate while 43.4% were found Resistant. For streptomycin, 1.2% of the isolates were found Susceptible, 18% were Intermediate while 91.6% were found Resistant. For tetracycline, 15.7% of the isolates were found Susceptible, 45.7% were Intermediate while 53% were found Resistant. The study confirmed the presence of multidrug resistance in indigenous clinical gram-negative bacteria which is an alarming situation and needs development of effective alternative strategies for the treatment of infections.

Extended Palatini gravity is the metric-affine gravity theory characterized by zero torsion, nonzero metricity and a quadratic of the antisymmetric Ricci curvature. It reduces dynamically to general relativity plus a geometric Proca field. In this work, we study imprints of the geometric Proca field on the gravitational waves. Our results show that the geometric Proca leaves significant signatures in the gravitational wave signal, and gravitational wave energy density could be large enough to be detectable by the next upgrade of the existing GW detectors. Our results, if confirmed observationally, will be an indication that the gravity could be non-Riemannian in nature.

AbstractWe investigate $$R_D$$ R D and $$R_{D^*}$$ R D ∗ anomalies in a low scale left–right symmetric model based on $$SU(3)_C\times SU(2)_L\times SU(2)_R\times U(1)_{B-L}$$ S U ( 3 ) C × S U ( 2 ) L × S U ( 2 ) R × U ( 1 ) B - L with a simplified Higgs sector consisting of only one bidoublet and one $$SU(2)_R$$ S U ( 2 ) R doublet. The Wilson coefficients relevant to the transition $$b\rightarrow c\tau \nu $$ b → c τ ν are derived by integrating out the charged Higgs $$H^\pm $$ H ± boson, which gives the dominant contributions. We emphasize that the charged Higgs effects, with the complex right-handed quark mixing matrix, can account for both $$R_D$$ R D and $$R_{D^*}$$ R D ∗ anomalies simultaneously, while adhering to a set of significant constraints including, for instance, $$\textrm{BR}(B^-_c \rightarrow \tau ^- \bar{\nu }_\tau ) $$ BR ( B c - → τ - ν ¯ τ ) and $$B_{s(d)}-\bar{B}_{s(d)}$$ B s ( d ) - B ¯ s ( d ) mixing. In relation to this, we show that the predicted values of the $$D^*$$ D ∗ , $$\tau $$ τ longitudinal polarizations and $$P_\tau (D)$$ P τ ( D ) can be affected for the set of the parameters of the model resolving the $$R_{D,D^*}$$ R D , D ∗ anomalies.

We investigate R_D and R_D^* anomalies in a low scale left–right symmetric model based on SU(3)_C× SU(2)_L× SU(2)_R× U(1)_B-L with a simplified Higgs sector consisting of only one bidoublet and one SU(2)_R doublet. The Wilson coefficients relevant to the transition b→ cτν are derived by integrating out the charged Higgs H^± boson, which gives the dominant contributions. We emphasize that the charged Higgs effects, with the complex right-handed quark mixing matrix, can account for both R_D and R_D^* anomalies simultaneously, while adhering to a set of significant constraints including, for instance, BR(B^-_c →τ ^- ν̅_τ ) and B_s(d)-B̅_s(d) mixing. In relation to this, we show that the predicted values of the D^* , τ longitudinal polarizations and P_τ (D) can be affected for the set of the parameters of the model resolving the R_D,D^* anomalies.

Direct CP asymmetry in semi-leptonic τ decays is an intriguing hint for new physics beyond the standard model. We investigate the CP asymmetry in τ^-→K_S^0π^-ν_τ and τ− → K−π0ντ decays in the context of the non-minimal SU(5) model, with 45-dimensional Higgs multiplet. We show that the associate color-triplet scalar, which is a natural example of a scalar leptoquark, can mediate the τ→ suν_τ transition and account for the observed 2.8 σ discrepancy in A_CP(τ^-→K_S^0π^-ν_τ) compared to the SM expectation. We also predict a sizable ACP(τ− → K−π0ντ), of 𝒪 (10−3), which can be experimentally accessible in current and near future experiments.

Abstract We investigate $$R_D$$ R D and $$R_{D^*}$$ R D ∗ anomalies in a low scale left–right symmetric model based on $$SU(3)_C\times SU(2)_L\times SU(2)_R\times U(1)_{B-L}$$ S U ( 3 ) C × S U ( 2 ) L × S U ( 2 ) R × U ( 1 ) B - L with a simplified Higgs sector consisting of only one bidoublet and one $$SU(2)_R$$ S U ( 2 ) R doublet. The Wilson coefficients relevant to the transition $$b\rightarrow c\tau \nu $$ b → c τ ν are derived by integrating out the charged Higgs $$H^\pm $$ H ± boson, which gives the dominant contributions. We emphasize that the charged Higgs effects, with the complex right-handed quark mixing matrix, can account for both $$R_D$$ R D and $$R_{D^*}$$ R D ∗ anomalies simultaneously, while adhering to a set of significant constraints including, for instance, $$\textrm{BR}(B^-_c \rightarrow \tau ^- \bar{\nu }_\tau ) $$ BR ( B c - → τ - ν ¯ τ ) and $$B_{s(d)}-\bar{B}_{s(d)}$$ B s ( d ) - B ¯ s ( d ) mixing. In relation to this, we show that the predicted values of the $$D^*$$ D ∗ , $$\tau $$ τ longitudinal polarizations and $$P_\tau (D)$$ P τ ( D ) can be affected for the set of the parameters of the model resolving the $$R_{D,D^*}$$ R D , D ∗ anomalies.

Using a data sample of $$\sqrt{s}=13\,\text {TeV}$$ proton-proton collisions collected by the CMS experiment at the LHC in 2017 and 2018 with an integrated luminosity of $$103\text {~fb}^{-1}$$ , the $$\text {B}^{0}_{\mathrm{s}} \rightarrow \uppsi (\text {2S})\text {K}_\mathrm{S}^{0}$$ and $$\text {B}^{0} \rightarrow \uppsi (\text {2S})\text {K}_\mathrm{S}^{0} \uppi ^+\uppi ^-$$ decays are observed with significances exceeding 5 standard deviations. The resulting branching fraction ratios, measured for the first time, correspond to $${\mathcal {B}}(\text {B}^{0}_{\mathrm{s}} \rightarrow \uppsi (\text {2S})K_\mathrm{S}^{0})/{\mathcal {B}}(\text {B}^{0}\rightarrow \uppsi (\text {2S})K_\mathrm{S}^{0}) = (3.33 \pm 0.69 (\text {stat})\, \pm 0.11\,(\text {syst}) \pm 0.34\,(f_{\mathrm{s}}/f_{\mathrm{d}})) \times 10^{-2}$$ and $${\mathcal {B}}(\text {B}^{0} \rightarrow \uppsi (\text {2S})\text {K}_\mathrm{S}^{0} \uppi ^{+} \uppi ^{-})/ {\mathcal {B}}(\text {B}^{0} \rightarrow \uppsi (\text {2S})\text {K}^{0}_{\mathrm{S}}) = 0.480 \pm 0.013\,(\text {stat}) \pm 0.032\,(\text {syst})$$ , where the last uncertainty in the first ratio is related to the uncertainty in the ratio of production cross sections of $$\hbox {B}^{0}_{\mathrm{s}}$$ and $$\hbox {B}^{0}$$ mesons, $$f_{\mathrm{s}}/f_{\mathrm{d}}$$ .

We develop a low scale left-right symmetric model based on SU(3)C × SU(2)L × SU(2)R × U(1)B−L × Z2 with a simplified Higgs sector consisting of only one bidoublet and one SU(2)R doublet. In this model, the tiny values of light neutrino masses are generated through an inverseseesaw mechanism. We emphasize that in this setup, the tree-level flavor changing neutral current can be strongly suppressed, consistent with the current experimental constraints. We show that the lightest CP -even Higgs boson, which is like the standard model Higgs boson, and the next lightest Higgs boson, h′, are generated from the neutral components of the bidoublet. We show that the mass of the next lightest Higgs boson can be of an order a few hundred GeVs. We analyze the detection of h′ at the Large Hadron Collider (LHC) for a center-of-mass energy √ s = 14 TeV and integrated luminosity Lint = 300 fb −1 via di-Higgs channel: h′ → hh → bb̄γγ and also in the ZZ channel: h′ → ZZ → 4l (l = e, μ) at an integrated luminosity Lint = 3000 fb. We consider three benchmark points for this analysis with mh′ = 250 GeV, 400 GeV, and 600 GeV. We show that promising signals with good statistical significances can be obtained in di-Higgs channel, with 2γ + 2b-jets final states.

The CMS Inner Tracker, made of silicon pixel modules, will be entirely replaced prior to the start of the High Luminosity LHC period. One of the crucial components of the new Inner Tracker system is the readout chip, being developed by the RD53 Collaboration, and in particular its analogue front-end, which receives the signal from the sensor and digitizes it. Three different analogue front-ends (Synchronous, Linear, and Differential) were designed and implemented in the RD53A demonstrator chip. A dedicated evaluation program was carried out to select the most suitable design to build a radiation tolerant pixel detector able to sustain high particle rates with high efficiency and a small fraction of spurious pixel hits. The test results showed that all three analogue front-ends presented strong points, but also limitations. The Differential front-end demonstrated very low noise, but the threshold tuning became problematic after irradiation. Moreover, a saturation in the preamplifier feedback loop affected the return of the signal to baseline and thus increased the dead time. The Synchronous front-end showed very good timing performance, but also higher noise. For the Linear front-end all of the parameters were within specification, although this design had the largest time walk. This limitation was addressed and mitigated in an improved design. The analysis of the advantages and disadvantages of the three front-ends in the context of the CMS Inner Tracker operation requirements led to the selection of the improved design Linear front-end for integration in the final CMS readout chip.