M. V. Purohit
A5058654077- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Medical Imaging Techniques and Applications
- Nuclear physics research studies
- Cosmology and Gravitation Theories
- Physics of Superconductivity and Magnetism
- Particle accelerators and beam dynamics
- Distributed and Parallel Computing Systems
- Advanced NMR Techniques and Applications
- Muon and positron interactions and applications
- Advanced Data Storage Technologies
- Atomic and Molecular Physics
- Astrophysics and Cosmic Phenomena
- International Science and Diplomacy
- 3D Shape Modeling and Analysis
- Big Data Technologies and Applications
University of South Carolina
2010-2024
Okinawa Institute of Science and Technology Graduate University
2020-2023
Beihang University
2018
Chonnam National University
2018
University of the Basque Country
2018
Brookhaven National Laboratory
2012-2015
Campbell Collaboration
2013
The University of Adelaide
2013
Stanford University
2010
United States Department of Energy
2009
This article reports world averages for measurements of b-hadron, c-hadron, and tau-lepton properties obtained by the Heavy Flavor Averaging Group (HFAG) using results available at least through end 2009. Some presented use data spring 2010. For averaging, common input parameters used in various analyses are adjusted (rescaled) to values, known correlations taken into account. The include branching fractions, lifetimes, neutral meson mixing parameters, CP violation semileptonic decays.
This article reports world averages for measurements of b-hadron and c-hadron properties obtained by the Heavy Flavor Averaging Group (HFAG) using results available at end 2007. For averaging, common input parameters used in various analyses are adjusted (rescaled) to values, known correlations taken into account. The include branching fractions, lifetimes, neutral meson mixing parameters, CP violation semileptonic decays.
We study the Dalitz plot of decay D(+)-->K(-)pi(+)pi(+) with a sample 15090 events from Fermilab experiment E791. Modeling amplitude as coherent sum known Kpi resonances and uniform nonresonant term, we do not obtain an acceptable fit. If allow mass width K(*)(0)(1430) to float, values consistent those PDG but chi(2) per degree freedom fit is still unsatisfactory. A good found when for presence additional scalar resonance, 797+/-19+/-43 MeV/c(2) 410+/-43+/-87 MeV/c(2). The become...
We present the first direct measurements of pion valence-quark momentum distribution which is related to square light-cone wave function. The were carried out using data on diffractive dissociation $500\mathrm{GeV}/c$ ${\ensuremath{\pi}}^{\ensuremath{-}}$ into dijets from a platinum target at Fermilab experiment E791. results show that $|q\overline{q}〉$ asymptotic function describes well for ${Q}^{2}\ensuremath{\sim}10(\mathrm{GeV}/c{)}^{2}$ or more. also measured transverse dijets.
We present an analysis of the exclusive semileptonic decay mode ${D}^{0}$\ensuremath{\rightarrow}${K}^{\mathrm{\ensuremath{-}}}$${e}^{+}$${\ensuremath{\nu}}_{e}$. have measured ratio rates .11(syst), which corresponds to a ${D}^{0}$\ensuremath{\rightarrow}${K}^{\mathrm{\ensuremath{-}}}$${e}^{+}$${\ensuremath{\nu}}_{e}$ branching fraction (3.8\ifmmode\pm\else\textpm\fi{}0.5\ifmmode\pm\else\textpm\fi{}0.6)%. Combining our result with measurement ${D}^{0}$ lifetime, we find...
A model-independent partial-wave analysis of the S-wave component Kπ system from decays D+ mesons to three-body K−π+π+ final state is described. Data come Fermilab E791 experiment. Amplitude measurements are made independently for ranges K−π+ invariant mass, and results obtained below 825 MeV/c2, where previous exist only in two mass bins. This method parametrizing a decay amplitude represents new approach analyzing such decays. Though no model required S-wave, parametrization relatively...
Using the large hadroproduced charm sample collected in experiment E791 at Fermilab, we report first directly measured constraint on decay-width difference Delta Gamma for mass eigenstates of D0-D0bar system. We obtain our result from lifetime measurements decays D0 --> K-pi+ and K-K+, under assumption CP invariance, which implies that are same. The K-K+ (the CP-even final state is \tau_KK = 0.410 +/- 0.011 0.006 ps, (an equal mixture CP-odd states tau_Kpi 0.413 0.003 0.004 ps. 2(Gamma_KK -...
The Proceedings of the 2003 SLAC Workshops on flavor physics with a high luminosity asymmetric e+e- collider. sensitivity to beyond Standard Model is addressed in detail, context improvement experimental measurements and theoretical calculations.
Using the data from Fermilab experiment 691, we have observed signals for decays ${{D}_{s}}^{\ifmmode\pm\else\textpm\fi{}}$ and ${D}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ analyzed these modes fraction due to ${\ensuremath{\rho}}^{0}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ ${f}_{0}(975){\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$. In addition, searched...
We propose the construction of, and describe in detail, a compact Muon Collider s-channel Higgs Factory.
We report on a Dalitz-plot analysis of 250 ${\mathit{D}}^{\ifmmode\pm\else\textpm\fi{}}$ and 290 ${\mathit{D}}_{\mathit{s}}^{\ifmmode\pm\else\textpm\fi{}}$ decays into ${\mathit{K}}^{+}$${\mathit{K}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{\ifmmode\pm\else\textpm\fi{}}$. measure the relative rate for each charmed meson decaying \ensuremath{\varphi}${\mathrm{\ensuremath{\pi}}}^{\ifmmode\pm\else\textpm\fi{}}$,...
This paper presents measurements of the production Ds- mesons relative to Ds+ as functions x_F and square p_t for a sample 2445 Ds decays phi pi. The were produced in Fermilab experiment E791 with 500 GeV/c pi- incident on one platinum four carbon foil targets. acceptance-corrected integrated asymmetry range -0.1 0.5 Ds+- is 0.032 +- 0.022 0.022, consistent no net asymmetry. results, p_t, are compared predictions large observed D+- same experiment. These comparisons support hypothesis that...
We report a measurement of the branching ratio B(D+ → ϱ0ℓ+νℓ)B(D+ K∗0ℓ+νℓ) from Fermilab charm hadroproduction experiment E791. Based on signals 49 ± 17 events in D+ ϱ0e+νe mode and 54 18 ϱ0μ+νμ mode, we measure. ϱ0e+νe)B(D+ e+νe) = 0.014 0.009,B(D+ ϱ0μ+νμ)B(D+ μ+νμ) 0.051 0.015 0.009. Combining results both electronic muonic modes, obtain ℓ+νℓ) 0.047 0.013. This result is compared to theoretical predictions.
We report results of a search for CP violation in the singly Cabibbo-suppressed decays D+ → K−K+π+, φπ+, K∗(892)0K+, and π−π+π+ based on data from charm hadroproduction experiment E791 at Fermilab. difference D− decay rates each final states. No evidence is seen. The rate asymmetry parameters (ACP), defined as divided by sum rates, are measured to be: ACP(KKπ) = −0.014±0.029, ACP(φπ) −0.028±0.036, ACP(K∗(892)K) −0.010±0.050 ACP(πππ) −0.017±0.042.
We report the results of a search for flavor-changing neutral-current decays $D^+\rightarrow \pi^+ \mu^+ \mu^-$ and e^+ e^-$ in data from Fermilab charm hadroproduction experiment E791. No signal above background is found, we obtain upper limits on branching fractions, $B(D^+\rightarrow \mu^-) < 1.8 \times 10^{-5}$ e^-) 6.6 10^{-5}$, at 90\% confidence level.
We have observed 99 decays of the charmed strange meson, ${D}_{s}^{+}$ (formerly called ${F}^{+}$), into \ensuremath{\varphi}${\ensuremath{\pi}}^{+}$ (61) and K${\ifmmode\bar\else\textasciimacron\fi{}}^{\mathrm{*}0}$${K}^{+}$ (38) final states in Fermilab photoproduction experiment E-691. determine lifetime to be (0.${48}_{\ensuremath{-}0.05}^{+0.06}$\ifmmode\pm\else\textpm\fi{}0.02)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}12}$ s. Using our reported measurement ${D}^{0}$...
Understanding of the weak force is traced from Fermi's theory beta decay to V-A mid 1950's. The theoretical suggestion and experimental confirmation parity violation in discussed. Topics are presented chronologically, leaving room for biographical sketches introducing basic mathematical physical concepts as needed.
We propose the construction of a compact Muon Collider Higgs Factory. Such machine can produce up to \sim 14,000 at 8\times 10^{31} cm^-2 sec^-1 clean events per year, enabling most precise possible measurement mass, width and Higgs-Yukawa coupling constants.
We report measurements of the decays ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${D}^{+}\ensuremath{\rightarrow}{\overline{K}}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${D}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$, and...