N. J. Joshi
A5000540874- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Advanced Statistical Process Monitoring
- Statistical Distribution Estimation and Applications
- Advanced Statistical Methods and Models
- Statistical Methods and Inference
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- Probability and Risk Models
- Probabilistic and Robust Engineering Design
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Bayesian Methods and Mixture Models
- Dark Matter and Cosmic Phenomena
- Liver Disease Diagnosis and Treatment
- Statistical Methods and Bayesian Inference
- Liver Disease and Transplantation
- Gaussian Processes and Bayesian Inference
- Black Holes and Theoretical Physics
- Ethics and Legal Issues in Pediatric Healthcare
- Fault Detection and Control Systems
- Hepatitis Viruses Studies and Epidemiology
- Tracheal and airway disorders
Indian Institute of Technology Delhi
2025
Indian Institute of Management Kashipur
2024
University of Delhi
2019-2023
Nepal Cancer Hospital and Research Center
2022
Bharati Vidyapeeth Deemed University
2021
Guru Nanak Dev University
2017
Institute of Medical Sciences
2017
Government Medical College, Amritsar
2017
Government Medical College
2017
Aneurin Bevan University Health Board
2015
We present results from a study of $X(3872)\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}J/\ensuremath{\psi}$ decays produced via exclusive $B\ensuremath{\rightarrow}KX(3872)$ decays. determine the mass to be ${M}_{X(3872)}=(3871.85\ifmmode\pm\else\textpm\fi{}0.27(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.19(\mathrm{syst}))\text{ }\text{ }\mathrm{MeV}$, 90% confidence level upper limit on natural width ${\ensuremath{\Gamma}}_{X(3872)}<1.2\text{ product branching fraction...
We report the observation of a new $D_{sJ}$ meson produced in $B^{+} \to \bar{D}^{0} D_{sJ} D^{0} K^{+}$. This state has mass $M=2708 \pm 9 ^{+11}_{-10} \rm{MeV}/{\it c}^{2}$, width $\Gamma = 108 23 ^{+36}_{-31} ~\rm{MeV}/ {\it c}^{2}$ and $1^{-}$ spin-parity. The results are based on an analysis 449 million $B\bar{B}$ events collected at $\Upsilon(4S)$ resonance with Belle detector KEKB asymmetric-energy $e^{+} e^{-}$ collider.
We report the results of a search for charmonium-like state produced in process gamma --> omega J/psi 3.9-4.2 GeV/c^2 mass region. observe significant enhancement, which is well-described by resonant shape with M = (3915 +/- 3 2) MeV/c^2 and total width Gamma (17 10 3) MeV. This enhancement may be related to one or more three states so far reported 3.90-3.95
We report a study of $B\to (J/\psi \gamma) K$ and (\psi' \gamma)K$ decay modes using $772\times 10^{6}$ $B\bar{B}$ events collected at the \Upsilon(4S)$ resonance with Belle detector KEKB energy-asymmetric $e^+ e^-$ collider. observe $X(3872) \to J/\psi \gamma$ first evidence for $\chi_{c2} in (X_{c\bar{c}}\gamma) decays, while search \psi' no significant signal is found. measure branching fractions, $\mathcal{B}(B^{\pm} X(3872) K^{\pm}) \mathcal{B}(X(3872) J/\psi\gamma)$ $=$...
The process $\gamma \gamma \to \phi \jpsi$ is measured for $\phi masses between threshold and 5 GeV/${\it c}^2$, using a data sample of 825 fb$^{-1}$ collected with the Belle detector. A narrow peak $8.8^{+4.2}_{-3.2}$ events, significance 3.2 standard deviations including systematic uncertainty, observed. mass natural width structure (named X(4350)) are to be $(4350.6^{+4.6}_{-5.1}(\rm{stat})\pm 0.7(\rm{syst})) \hbox{MeV}/{\it c}^2$ $(13^{+18}_{-9}(\rm{stat})\pm 4(\rm{syst})) \hbox{MeV}$,...
We present a measurement of the charmless semileptonic decay $B^0\to\pi^-\ell^+\nu$ using data sample containing 657$\times 10^6$ $B\bar{B}$ events collected with Belle detector at KEKB asymmetric-energy $e^+e^-$ collider operating near $\Upsilon(4S)$ resonance. determine total branching fraction decay, $\mathcal{B}(B^0\to\pi^-\ell^+\nu)=(1.49\pm 0.04{(\mathrm{stat})}\pm 0.07{(\mathrm{syst})})\times 10^{-4}$. also report new precise differential rate, and extract Cabibbo-Kobayashi-Maskawa...
We report a measurement of D0-D0bar mixing in D0->Ks pi+ pi- decays using time-dependent Dalitz plot analysis. first assume CP conservation and subsequently allow for violation. The results are based on 540 fb$^{-1}$ data accumulated with the Belle detector at KEKB $e^+e^-$ collider. Assuming negligible violation, we measure parameters $x=(0.80\pm0.29^{+0.09 +0.10}_{-0.07 -0.14})%$ $y=(0.33\pm0.24^{+0.08 +0.06}_{-0.12 -0.08})%$, where errors statistical, experimental systematic, systematic...
We present a study of $B\ensuremath{\rightarrow}X(3872)K$ with $X(3872)$ decaying to ${D}^{*0}{\overline{D}}^{0}$ using sample $657\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs recorded at the $\ensuremath{\Upsilon}(4S)$ resonance Belle detector KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. Both ${D}^{*0}\ensuremath{\rightarrow}{D}^{0}\ensuremath{\gamma}$ and ${D}^{*0}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{0}$ decay modes are used. find peak...
We present a new measurement of the unitarity triangle angle phi3 using Dalitz plot analysis KsPi+Pi- decay neutral D meson produced in B->D(*)K decays. The method exploits interference between D0 and D0bar to extract phi3, strong phase delta ratio r suppressed allowed amplitudes. apply this 605 fb-1 data sample collected by Belle experiment. uses three decays: B->DK, B->D*K with D*->DPi0 D*->Dgamma, as well corresponding charge-conjugate modes. From combined maximum likelihood fit modes, we...
From a Dalitz plot analysis of $B\ensuremath{\rightarrow}K{\ensuremath{\pi}}^{+}{\ensuremath{\psi}}^{\ensuremath{'}}$ decays, we find signal for $Z(4430{)}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\psi}}^{\ensuremath{'}}$ with mass $M=({4443}_{\ensuremath{-}12\ensuremath{-}13}^{+15+19})\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, width $\ensuremath{\Gamma}=({107}_{\ensuremath{-}43\ensuremath{-}56}^{+86+74})\text{ }\mathrm{MeV}$, product branching fraction...
The interference fragmentation function translates the of a quark with transverse projection spin into an azimuthal asymmetry two final-state hadrons. In e+e- annihilation product functions is measured. We report nonzero asymmetries for pairs charge-ordered pi+pi- pairs, which indicate significant in this channel. results are obtained from 672 fb-1 data sample that contains 711 \times 106 and was collected at near ?(4S) resonance, Belle detector KEKB asymmetric-energy collider.
We report measurements of the exclusive cross section for e+e−→D0D−π+ over center-of-mass energy range 4.0 GeV to 5.0 with initial-state radiation and first observation decay ψ(4415)→D0D−π+. From a study resonant substructure in ψ(4415) we conclude that ψ(4415)→D0D−π+ is dominated by ψ(4415)→DD¯2*(2460). obtain B(ψ(4415)→D0D−πnonresonant+)/B(ψ(4415)→DD¯2*(2460)→D0D−π+)<0.22 at 90% C.L. The analysis based on data sample collected Belle detector an integrated luminosity 673 fb−1.Received 24...
We present a new measurement of the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}c\overline{c}$ cross section where $c\overline{c}$ pair can fragment either into charmed hadrons or charmonium state. In former case $J/\ensuremath{\psi}$ and hadron are reconstructed, while latter process is measured using recoil mass technique, which allows identification two-body final states without reconstruction one charmonia. The...
This article describes a determination of the Cabibbo-Kobayashi-Maskawa matrix element $|{V}_{cb}|$ from decay ${B}^{0}\ensuremath{\rightarrow}{D}^{*\ensuremath{-}}{\ensuremath{\ell}}^{+}{\ensuremath{\nu}}_{\ensuremath{\ell}}$ using $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ Belle data collected near $\ensuremath{\Upsilon}(4S)$ resonance. We simultaneously measure product form factor normalization $\mathcal{F}(1)$ and as well three parameters ${\ensuremath{\rho}}^{2}$, ${R}_{1}(1)$...
ABSTRACT In this paper, we aim to develop the Shewhart‐type control charts for monitoring percentiles of an inverse Pareto distribution (IPD) using complete and middle‐censored data sets. We obtain maximum likelihood (ML) estimators percentile function under both cases. Furthermore, discuss asymptotic properties ML use them charts. A large‐scale simulation analysis is performed investigate in‐control (IC) performance proposed chart schemes. This based on various criteria such as average run...
We present a search for the rare decays B→h(*)ν¯ν, where h(*) stands light meson. A data sample of 535×106 B¯¯¯B pairs collected with Belle detector at KEKB e+e− collider is used. Signal candidates are required to have an accompanying B meson fully reconstructed in hadronic mode and signal side particles consistent single No significant observed we set upper limits on branching fractions 90% confidence level. The B0→K*0ν¯ν B+→K+ν¯ν more stringent than previous constraints, while first...
The differential cross sections for the process $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ have been measured in kinematic range $0.6\text{ }\text{ }\mathrm{GeV}<W<4.1\text{ }\mathrm{GeV}$, $|\mathrm{cos}{\ensuremath{\theta}}^{*}|<0.8$ energy and pion scattering angle, respectively, $\ensuremath{\gamma}\ensuremath{\gamma}$ center-of-mass system. results are based on a $223\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data...
We have studied B_(s);(0)-->D_(s);(-)pi;(+) and B_(s);(0)-->D_(s);(-/+)K;(+/-) decays using 23.6 fb;(-1) of data collected at the Upsilon(5S) resonance with Belle detector KEKB e;(+)e;(-) collider. This highly pure sample is used to measure branching fraction, B(B_(s);(0)-->D_(s);(-)pi;(+))=[3.67_(-0.33);(+0.35)(stat)-0.42+0.43(syst)+/-0.49(f_(s))]x10;(-3) (f_(s)=N_(B_(s);((*))B[over ]_(s);((*)))/N_(bb[over ])) fractions B_(s);(0) event types energy, in particular N_(B_(s);(*)B[over...
We search for the flavor-changing neutral current decays D0\to mu+mu- and e+e-, lepton-flavor violating e\pm mu\mp using 660 fb^-1 of data collected with Belle detector at KEKB asymmetric-energy e+e- collider. find no evidence any these decays. obtain significantly improved upper limits on branching fractions: B(D0\to mu+mu-)<1.4x10-7, e+e-)<7.9x10-8, e+mu-)+B(D0\to mu+e-)<2.6x10-7 90% confidence level.
We perform the first search for lepton-number-violating B+->D-l+l'+ decays, where l and l' stand e or mu, using 772 x 10^6 BB-bar pairs accumulated at Upsilon(4S) resonance with Belle detector KEKB e^+e^- collider. No evidence these decays has been found. Assuming uniform three-body phase space distributions D-l+l+ we set following upper limits on branching fractions 90% confidence level: Br(B+ -> D-e+e+) < 2.6x10^-6, D-e+mu+) 1.8x10^-6 D-mu+mu+) 1.0x10^-6.
In recent years, several probability distributions have been introduced in the literature to analyze data exhibiting an upside-down bathtub–shaped failure rate; inverse Pareto distribution (IPD) is appropriate choice among them. For stress–strength reliability models, estimation of parameters interesting area research. this article, we estimate parameter R=P(X>Y) (where X and Y are strength stress variables, respectively) IPD, whereby focus on problem fixed-accuracy confidence interval R. It...
We have searched for $CP$ violation in the charmed meson decays ${D}_{(s)}^{+}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{+}$ and ${D}_{(s)}^{+}\ensuremath{\rightarrow}{K}_{S}^{0}{K}^{+}$ using $673\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected with Belle detector at KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. No evidence is observed. report most sensitive asymmetry measurements to date these decays:...
We report a measurement of exclusive e+e−→D(*)+sD(*)−s cross sections as function center-of-mass energy near the D(*)+sD(*)−s threshold with initial-state radiation. The analysis is based on data sample collected Belle detector an integrated luminosity 967 fb−1.Received 19 November 2010DOI:https://doi.org/10.1103/PhysRevD.83.011101© 2011 American Physical Society