Pure Leptonic Radiative Decays B±,Ds→ℓνγB^\pm, D_s\to\ell\nu\gamma and the Annihilation Graph

Pure leptonic radiative decays of heavy-light mesons are calculated using a very simple non-relativistic model. Dominant contribution originates from photon emission from light initial quark. We find $BR(B^\pm\to\ell\nu\gamma)\sim3.5\times10^{-6}$ and $BR(D_s\to \ell\nu\gamma)\sim1.7 \times10^{-4}$. The importance of these reactions to clarify the dynamics of the annihilation graph is emphasized.Comment: 7 pages, LaTeX, 3 figure

On Direct Verification of Warped Hierarchy-and-Flavor Models

We consider direct experimental verification of warped models, based on the Randall-Sundrum (RS) scenario, that explain gauge and flavor hierarchies, assuming that the gauge fields and fermions of the Standard Model (SM) propagate in the 5D bulk. Most studies have focused on the bosonic Kaluza Klein (KK) signatures and indicate that discovering gauge KK modes is likely possible, yet challenging, while graviton KK modes are unlikely to be accessible at the LHC, even with a luminosity upgrade. We show that direct evidence for bulk SM fermions, {\it i.e.} their KK modes, is likely also beyond the reach of a luminosity-upgraded LHC. Thus, neither the spin-2 KK graviton, the most distinct RS signal, nor the KK SM fermions, direct evidence for bulk flavor, seem to be within the reach of the LHC. We then consider hadron colliders with $\sqrt{s} =$ 21, 28, and 60 TeV. We find that discovering the first KK modes of SM fermions and the graviton typically requires the Next Hadron Collider (NHC) with $\sqrt{s} \approx 60$ TeV and ${\cal O}(1)$ ab$^{-1}$ of integrated luminosity. If the LHC yields hints of these warped models, establishing that Nature is described by them, or their 4D CFT duals, requires an NHC-class machine in the post-LHC experimental program.Comment: Revtex4, 21 pages, 11 figure

Knowledge and practice regarding menstrual hygiene among adolescent girls of rural field practice area of RIMS, Raipur (C. G.), India

Background: Adolescent age group among girls have been recognized as a special period which signifies the transition from girlhood to womanhood. Menstruation is generally considered as unclean in the Indian society. Most of the adolescent girls had incomplete and inaccurate information about the menstrual physiology and hygiene as reported by many Indian studies. Very few authors have included the detailed aspects of the menstrual practices among adolescent girls.Methods: The current Community based cross sectional study was conducted by department of obstetrics and Gynaecology in connection with department of community medicine, Raipur Institute of Medical Science, Raipur (C.G), India. Among the adolescent school going girls in the field practice area of the Rural Health Unit and Training Centre during study period of 6 month from July 2017 to December 2017. 263 girls from the above mentioned schools, of the 8th and 9th standards, were selected for the study.Results: Majority of the school going adolescent girls belongs to 13 and 14 year of age. 50.95% , 21.67% and 12.93% girls reported that they had their menarche at the age of 13 year, 12 year and 14 year respectively. Majority of the girls were using cloth (49.81%) and only 17.87% were using sanitary napkins. Cleaning of external genitalia was not satisfactory in 32.70% of the girls. Only 58.17% girls used both soap and water for cleaning the genitalia. Pain in abdomen (59.70%) was found to be the most frequent complaint during menstruation.Conclusions: Knowledge on menstruation is sub-optimal and the practices are unacceptable for proper hygiene among study subjects. Menstrual hygiene is an important issue needs to be ensured

Scalar meson in dynamical and partially quenched two-flavor QCD: lattice results and chiral loops

This is an exploratory study of the lightest non-singlet scalar $q\bar q$ state on the lattice with two dynamical quarks. Domain Wall fermions are used for both sea and valence quarks on a 16^3*32 lattice with an inverse lattice spacing of 1.7 GeV. We extract the scalar meson mass 1.58(34) GeV from the exponential time-dependence of the dynamical correlators with $m_{val}=m_{sea}$ and N_f=2. Since this statistical error-bar from dynamical correlators is rather large, we analyze also the partially quenched lattice correlators with $m_{val}$ not equal $m_{sea}$. They are positive for $m_{val}>=m_{sea}$ and negative for $m_{val}<m_{sea}$. In order to understand this striking effect of partial quenching, we derive the scalar correlator within the Partially Quenched ChPT and find it describes lattice correlators well. The leading unphysical contribution in Partially Quenched ChPT comes from the exchange of the two pseudoscalar fields and is also positive for $m_{val}>=m_{sea}$ and negative for $m_{val}<m_{sea}$ at large t. After the subtraction of this unphysical contribution from the partially quenched lattice correlators, the correlators are positive and exponentially falling. The resulting scalar meson mass 1.51(19) GeV from the partially quenched correlators is consistent with the dynamical result and has appreciably smaller error-bar.Comment: 23 pages, 8 figure

Neutrinos in a left-right model with a horizontal symmetry

We analyze the lepton sector of a Left-Right Model based on the gauge group SU(2)_L x SU(2)_R x U(1), concentrating mainly on neutrino properties. Using the seesaw mechanism and a horizontal symmetry, we keep the right-handed symmetry breaking scale relatively low, while simultaneously satisfying phenomenological constraints on the light neutrino masses. We take the right-handed scale to be of order 10's of TeV and perform a full numerical analysis of the model's parameter space, subject to experimental constraints on neutrino masses and mixings. The numerical procedure yields results for the right-handed neutrino masses and mixings and the various CP-violating phases. We also discuss phenomenological applications of the model to neutrinoless double beta decay, lepton-flavor-violating decays (including decays such as \tau \to 3\mu) and leptogenesis.Comment: 26 pages, 4 figure

Probing collective dynamics of active particles using modulation force spectroscopy

In this letter, we report a method of measuring the dynamic viscosity of self-propelled active particles using an intensity-modulated optical tweezer. We have used a 6 μm trapped polystyrene bead suspended in a bath of motile bacterial cells as a probe. The response function amplitude of the oscillatory bead directly measures the dynamics of the spatiotemporal structure of the motile particles. We find that unlike passive systems, the viscosity is defined by distributions of response function amplitudes that represent the long-range active temporal structures. Appropriate Langevin equations are set up that capture all these essential features

Constraint on the mass scale of a left-right-symmetric electroweak theory from the KL-KS mass difference

The KL-KS mass difference provides a stringent constraint on the mass (MR) of the charged right-handed gauge field occurring in a "manifest" left-right-symmetric electroweak theory, yielding MR1.6 TeV. Taken in the context of a grand-unifying gauge theory, e.g., O(10), such a large bound on MR, along with the measured value of sin2θW, implies that MR109 GeV. © 1982 The American Physical Society