Observation of γγ → ττ in proton-proton collisions and limits on the anomalous electromagnetic moments of the τ lepton

The production of a pair of τ leptons via photon–photon fusion, γγ → ττ, is observed for the f irst time in proton–proton collisions, with a significance of 5.3 standard deviations. This observation is based on a data set recorded with the CMS detector at the LHC at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138 fb−1. Events with a pair of τ leptons produced via photon–photon fusion are selected by requiring them to be back-to-back in the azimuthal direction and to have a minimum number of charged hadrons associated with their production vertex. The τ leptons are reconstructed in their leptonic and hadronic decay modes. The measured fiducial cross section of γγ → ττ is σfid obs = 12.4+3.8 −3.1 fb. Constraints are set on the contributions to the anomalous magnetic moment (aτ) and electric dipole moments (dτ) of the τ lepton originating from potential effects of new physics on the γττ vertex: aτ = 0.0009+0.0032 −0.0031 and |dτ| < 2.9×10−17ecm (95% confidence level), consistent with the standard model

Rare b→sllb \rightarrow sll decays at 13 TeVTeV by CMS Detector

Recent results on the rare $b \rightarrow sll$ decays are presented by the CMS experiment at 13 $TeV$. The individual branching fraction results of $B^{\pm} \rightarrow K^{\pm}\mu^{+}\mu^{-}$ and $B^{\pm} \rightarrow K^{\pm}e^{+}e^{-}$ decays are shown along with the lepton flavor universality (LFU). The effective lifetime of $B^{0}_{s} \rightarrow J/\psi K^{0}_{S}$ decay is discussed. Finally, the CP averaged ($F_l$) and CP Asymmetry ($A_6$) angular observables of $B_{s}^{0} \rightarrow \phi \mu \mu$ decay is presented as a function of a square of dimuon invariant mass ($q^2$) using the toy MC samples

A prospective study on limberg flap procedure for pilonidal sinus

Pilonidal sinus is a blind ending track containing hair follicles within it and is primarily a disease involving sacrococcygeal region. The exact etiology of this disease process is unknown and is still controversial. There are various treatment methods for pilonidal sinus and the preferred method is Limberg flap reconstruction surgery due to its less complications and less recurrence. Our study was a prospective study including 28 patients who were admitted for pilonidal sinus and operated by Limberg flap reconstruction surgery at Veer Surendra Sai Institute of Medical Sciences And Research from January 2018 to June 2020. Our study included 28 patients, and the female to male ratio is 1:13. Duration of symptoms had a range from 1-4 months and the mean age of the study population was 28.5 year. Patients underwent Limberg flap reconstruction surgery and 89.28% followed a normal course after surgery , 7.14% developed seroma and 3.57% developed surgical site infection in their post-operative period. Limberg flap reconstruction surgery is the most preferred method of treatment for pilonidal sinus because of its low infection and recurrence rates, better aesthetic results after surgery and short duration of hospital stay.<jats:p /

Acanthosis nigricans and its association with cardio-metabolic risk factors in children with overweight/obesity: A school-based cross-sectional study

Background: Acanthosis nigricans (AN) is a common finding often associated with hyperinsulinemia and childhood obesity. There has been a lack of studies evaluating the association of AN with underlying cardio-metabolic risk factors in children and adolescents. Our objective was to study the association between AN and cardio-metabolic risk factors in children with overweight/obesity. Methods: This cross-sectional study included school-going children (6–16 years of age) with overweight/obesity. Physical examination, anthropometry, and blood pressure (BP) data were collected. Fasting blood samples were collected to measure insulin, glucose, homeostasis model assessment index (HOMAIR), and lipid profile. Results: Of 1930 children screened, 545 had overweight/obesity, and were included. Boys to girls ratio was 1.27. AN was present in 46.4% of children. Children with AN had higher body mass index [BMI] (P < 0.01), waist circumference [WC] (P < 0.01), systolic (P = 0.03), and diastolic BP (P = 0.02), hyperglycemia (P = 0.02), hyperinsulinemia (P < 0.01), and a higher HOMA-IR (P < 0.01) compared to those without AN. HDL level was lower in children with AN. Conclusions: Children with overweight/obesity who have AN have significant elevations of BP, insulin level, and HOMA-IR. AN is a clinical marker that seems to be associated with cardio-metabolic risk factors in children with overweight/obesity in the given study population