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We propose a hidden sector fermion dark matter model which follows a dark SU(2) $$_\mathrm {H}$$ H symmetry. Fermions in the dark sector also carry a global U(1) $$_\mathrm {H}$$ H charge while the gauge bosons and dark scalar do not have any global U(1) $$_\mathrm {H}$$ H charge. The lightest fermion in dark sector can serve as a potential dark matter candidate. We...
The four-body non-resonant rare $$\bar{B}\rightarrow \bar{K}\pi \ell \ell $$ B ¯ → K ¯ π ℓ ℓ decay is important both as a background to the benchmark resonant mode $$\bar{B}\rightarrow \bar{K}^*\ell \ell $$ B ¯ → K ¯ ∗ ℓ ℓ and as sensitive probe for new physics beyond the Standard Model (SM). We show that in the SM the branching ratio of $$\bar{B}\rightarrow...
We discuss physics of exotic high baryon density QCD phases which are believed to exist in the core of a neutron star. This can provide a laboratory for exploring exotic physics such as axion emission, KK graviton production etc. Much of the physics of these high-density phases is model-dependent and not very well understood, especially the densities expected to occur inside neutron stars. We follow...
We show that a renormalizable theory based on gauge group SO(10) and Higgs system 10 $$\oplus $$ ⊕ 210 $$\oplus $$ ⊕ 126 $$\oplus $$ ⊕ $${\overline{\mathbf{126}}}$$ 126 ¯ with no scale supergravity can lead to a Starobinsky kind of potential for inflation. Successful inflation is possible in cases where the potential during inflation corresponds to $$SU(3)_\mathrm...
Studies on neutrino–nucleon ( $${\nu }N$$ ν N ) cross-sections have regained interest due to increasing importance of precision measurements, as they are needed as an ingredient in all neutrino experiments. In this work, we use the QCD-inspired double asymptotic limit fit of electron–proton structure function $$F_{2}^{ep}$$ F 2 e p to low- $$ x $$ x HERA data, to calculate...
Left–right symmetric gauge theory presents a minimal paradigm to accommodate massive neutrinos with all the known conserved symmetries duly gauged. The work presented here is based on the argument that the see-saw mechanism does not force the new right-handed symmetry scale to be very high, and as such some of the species from the spectrum of the new gauge and Higgs bosons can have masses within a...
Using the residual symmetry approach, we propose a complex extension of the scaling ansatz on the neutrino Majorana mass matrix $$M_\nu $$ M ν which allows a nonzero mass for each of the three light neutrinos as well as a nonvanishing $$\theta _{13}$$ θ 13 . Leptonic Dirac CP violation must be maximal while atmospheric neutrino mixing need not be exactly maximal. Each of the two...
A review of the class of models that go under the name bulk Randall–Sundrum models is presented here. The issue of localization of quantum fields in the five-dimensional bulk and the profiles of the zero modes and the Kaluza–Klein excitations are discussed. The zero modes of these bulk fields are, in general, partially composite. The degree of compositeness of the different fields is discussed and...
In the next-to-minimal supersymmetric Standard Model (NMSSM), a pure singlet-like light pseudoscalar ( $$A_1$$ A 1 ) can dominantly decay to diphoton mode. In the chargino–neutralino associated production, followed by decays of heavier neutralinos to the lighter ones along with $$A_1$$ A 1 leads to a final-state . In this talk, the enhancement mechanism of diphoton mode of...
Neutrino oscillations have been firmly established in the past few decades due to a vast variety of experiments and five of the oscillation parameters (three angles and two mass-squared differences) have been measured to varying degrees of precision. Here the focus is on an important parameter entering the oscillation framework – the leptonic CP-violating phase $$\delta $$ δ , about which...
The rare decay $$B\rightarrow {K^{*}}\ell ^+\ell ^-$$ B → K ∗ ℓ + ℓ - is a very significant mode to search for physics beyond the Standard Model (SM). The mode provides a very rich spectrum of observables obtained from the angular distribution of its decay products. The recent LHCb measured values of these observables are used to conclude an evidence of right-handed currents at...
We consider the s-channel resonance to fit the 2 TeV ATLAS diboson excess. We address the production mechanism of the resonance, its decay and coupling measurement. In order to explain only the hadronic channel excess, we consider the scenario where resonance decays to two new beyond Standard Model (BSM) particles (in the mass range of W / Z boson) and also explore the possibility of three-particle...
We outline some of the popular mass restricting variables for the semi-invisible productions at the Large Hadron Collider. In this context, heavy resonating mass, if produced through antler decay topology may already be detectable. New mass variables constructed by applying this mass constraint proved to have an array of interesting properties, including a new kink solution at the true masses of the...
We list operators of the superpotential of the effective MSSM that emerge from the NMSGUT up to sextic degree. We give illustrative expressions for the coefficients in terms of NMSGUT parameters. We also estimate the impact of GUT scale threshold corrections on these effective operators in view of the demonstration that B violation via quartic superpotential terms can be suppressed to acceptable levels...
The searches for supersymmetry at the Large Hadron Collider (LHC) have so far yielded only null results and have considerably tightened the bounds on the sparticle masses. This has generated some skepticism in the literature regarding the ‘naturalness of SUSY’ which qualitatively requires some sparticles to be relatively light. Re-examining some of the bounds from LHC searches, it is argued with specific...
The ‘hierarchy problem’ plagues the Standard Model of particle physics. The source of this problem is our inability to answer the following question: Why is the Higgs mass so much below the GUT or Planck scale? A brief description about how ‘supersymmetry’ and ‘composite Higgs’ address this problem is given here.
C S Lam has suggested that the PMNS matrix (or at least some of its elements) can be predicted by embedding the residual symmetry of the leptonic mass terms into a bigger symmetry. We analyse the possibility that the residual symmetries consist of involution generators only and explore how Lam’s idea can be implemented.
The phenomenological study of neutral heavy gauge boson ( $$Z^{\prime }_{B-L}$$ Z B - L ′ ) of the minimal $$B-L$$ B - L extension was done in the context of the LHC, on the dimuon production channel. The study begins with the LEP-II constraints on $$Z'$$ Z ′ searches, and the dimuon events are simulated at the parton level at CM energies of 7 TeV and 8 TeV and studied...
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