R. Kumar

ORCID: 0000-0002-5754-5410
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About
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Research Areas
  • Particle physics theoretical and experimental studies
  • High-Energy Particle Collisions Research
  • Quantum Chromodynamics and Particle Interactions
  • Particle Detector Development and Performance
  • Dark Matter and Cosmic Phenomena
  • Cosmology and Gravitation Theories
  • Pulsars and Gravitational Waves Research
  • Computational Physics and Python Applications
  • Neutrino Physics Research
  • Gamma-ray bursts and supernovae
  • Astrophysical Phenomena and Observations
  • Geophysics and Gravity Measurements
  • Medical Imaging Techniques and Applications
  • Astrophysics and Cosmic Phenomena
  • Geophysics and Sensor Technology
  • Particle Accelerators and Free-Electron Lasers
  • High-pressure geophysics and materials
  • Black Holes and Theoretical Physics
  • Radio Astronomy Observations and Technology
  • Atomic and Subatomic Physics Research
  • Superconducting Materials and Applications
  • Nuclear Physics and Applications
  • Nuclear physics research studies
  • Nuclear reactor physics and engineering
  • Distributed and Parallel Computing Systems

Malaviya National Institute of Technology Jaipur
2021-2022

Panjab University
2013-2022

Bhabha Atomic Research Centre
2013-2022

Mount Washington Observatory
2022

Mississippi State University
2022

Central University of Haryana
2022

Punjab Agricultural University
2015-2021

Akal University
2019-2021

High Energy Accelerator Research Organization
2021

California Institute of Technology
2020

We report the first measurement of $\ensuremath{\tau}$ lepton polarization ${P}_{\ensuremath{\tau}}({D}^{*})$ in decay $\overline{B}\ensuremath{\rightarrow}{D}^{*}{\ensuremath{\tau}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\tau}}$ as well a new ratio branching fractions...

10.1103/physrevlett.118.211801 article EN publisher-specific-oa Physical Review Letters 2017-05-26

We report a measurement of the ratio ${\cal R}(D^*) = {\cal B}(\bar{B}^0 \rightarrow D^{*+} \tau^- \bar{\nu}_{\tau})/{\cal \ell^- \bar{\nu}_{\ell})$, where $\ell$ denotes an electron or muon. The results are based on data sample containing $772\times10^6$ $B\bar{B}$ pairs recorded at $\Upsilon(4S)$ resonance with Belle detector KEKB $e^+ e^-$ collider. select $B^0 \bar{B}^0$ by reconstructing both $B$ mesons in semileptonic decays to $D^{*\mp} \ell^{\pm}$. measure R}(D^*)= 0.302 \pm...

10.1103/physrevd.94.072007 article EN publisher-specific-oa Physical review. D/Physical review. D. 2016-10-27

On April 1st, 2019, the Advanced Laser Interferometer Gravitational-Wave Observatory (aLIGO), joined by Virgo detector, began third observing run, a year-long dedicated search for gravitational radiation. The LIGO detectors have achieved higher duty cycle and greater sensitivity to waves than ever before, with Hanford achieving angle-averaged binary neutron star coalescences distance of 111 Mpc, Livingston 134 Mpc factors 74.6% 77.0% respectively. improvement in stability is result several...

10.1103/physrevd.102.062003 article EN cc-by Physical review. D/Physical review. D. 2020-09-11

We report a measurement of the exclusive e+ e- -->Lambda+_(c)Lambda-_(c) cross section as function center-of-mass energy near Lambda+_(c)Lambda-_(c) threshold. A clear peak with significance 8.2sigma is observed in invariant mass distribution just above With an assumption resonance origin for peak, and width M=[4634 (+8)_(-7)(stat)(+5)_(-8)(syst)] MeV/c(2) Gamma_(tot)=[92 (+40)_(-24)(stat)(+10)_(-21)(syst)] MeV are determined. The analysis based on study events initial-state-radiation...

10.1103/physrevlett.101.172001 article EN Physical Review Letters 2008-10-24

We report a high-statistics measurement of the branching fraction for tau^- --> pi^- pi^0 nu_tau and invariant mass spectrum produced system using 72.2 fb^-1 data recorded with Belle detector at KEKB asymmetric-energy e^+ e^- collider. The obtained is (25.24 +/- 0.01 0.39)%, where first error statistical second systematic. unfolded used to determine resonance parameters rho(770), rho'(1450), rho"(1700) mesons. also use this estimate hadronic (2pi) contribution anomalous magnetic moment muon...

10.1103/physrevd.78.072006 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 2008-10-28

We report a study of the processes ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{D}^{(*)}{\overline{D}}^{(*)}$. In $J/\ensuremath{\psi}{D}^{*}{\overline{D}}^{*}$ we observe significant enhancement in ${D}^{*}{\overline{D}}^{*}$ invariant mass spectrum, which interpret as new charmoniumlike state and denote $X(4160)$. The $X(4160)$ parameters are $M=({4156}_{\ensuremath{-}20}^{+25}\ifmmode\pm\else\textpm\fi{}15)\text{ }\text{ }\mathrm{MeV}/{c}^{2}$...

10.1103/physrevlett.100.202001 article EN Physical Review Letters 2008-05-19

The Collins effect connects transverse quark spin with a measurable azimuthal asymmetry in the yield of hadronic fragments around quark's momentum vector. Using two different reconstruction methods we measure statistically significant asymmetries for charged pion pairs ${e}^{+}{e}^{\ensuremath{-}}$ annihilation at center-of-mass energies 10.52 GeV and 10.58 GeV, which can be attributed to fragmentation primordial quarks components. measurement was performed using data set $547\text{ }\text{...

10.1103/physrevd.78.032011 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 2008-08-18

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, $\mathcal{B}(B^{\pm} X(3872) K^{\pm}) \mathcal{B}(X(3872) J/\psi\gamma)$ $=$...

10.1103/physrevlett.107.091803 article EN publisher-specific-oa Physical Review Letters 2011-08-26

We report on a search for heavy neutrinos in B-meson decays. The results are obtained using data sample that contains 772x10^6 BB-bar pairs collected at the Upsilon(4S) resonance with Belle detector KEKB asymmetric-energy e+e- collider. No signal is observed and upper limits set mixing of left-handed Standard Model mass range 0.5 - 5.0 GeV/c^2.

10.1103/physrevd.87.071102 article EN publisher-specific-oa Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 2013-04-22

The raw outputs of the detectors within Advanced Laser Interferometer Gravitational-Wave Observatory need to be calibrated in order produce estimate dimensionless strain used for astrophysical analyses. two have been upgraded since second observing run and finished year-long third run. Understanding, accounting, and/or compensating complex-valued response each part improves overall accuracy estimated detector gravitational waves. We describe improved understanding methods quantify detector,...

10.1088/1361-6382/abb14e article EN Classical and Quantum Gravity 2020-08-21

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...

10.1103/physrevlett.99.131803 article EN Physical Review Letters 2007-09-28

Using a $282\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected by the Belle experiment at KEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider, we study ${D}^{0}$ decays to ${K}^{\ensuremath{-}}{\ensuremath{\ell}}^{+}\ensuremath{\nu}$ and ${\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\ell}}^{+}\ensuremath{\nu}$ final states. The flavor momentum are tagged through full reconstruction of recoiling charm meson additional mesons from fragmentation. method provides very good...

10.1103/physrevlett.97.061804 article EN Physical Review Letters 2006-08-11

We present a high-statistics measurement of differential cross sections and the total section for process $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ in kinematic range $0.6\text{ }\text{ }\mathrm{GeV}\ensuremath{\le}W\ensuremath{\le}4.0\text{ }\mathrm{GeV}$ $|\mathrm{cos}{\ensuremath{\theta}}^{*}|\ensuremath{\le}0.8$, where $W$ ${\ensuremath{\theta}}^{*}$ are energy pion scattering angle, respectively,...

10.1103/physrevd.78.052004 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 2008-09-12

Gravitational Wave interferometers achieve their profound sensitivity by combining a Michelson interferometer with optical cavities, suspended masses, and now, squeezed quantum states of light. These modify the measurement process LIGO, VIRGO GEO600 to reduce noise that masks astrophysical signals; thus, improvements squeezing are essential further expand our gravitational view universe. Further reducing will require both lowering decoherence from losses as well more sophisticated...

10.1103/physrevd.104.062006 article EN Physical review. D/Physical review. D. 2021-09-13

Charged lepton flavor violation is forbidden in the Standard Model but possible several new physics scenarios. In many of these models, radiative decays $\tau^{\pm}\rightarrow\ell^{\pm}\gamma$ ($\ell=e,\mu$) are predicted to have a sizeable probability, making them particularly interesting channels search at various experiments. An updated via using full data Belle experiment, corresponding an integrated luminosity 988 fb$^{-1}$, reported for charged violation. No significant excess over...

10.1007/jhep10(2021)019 article EN cc-by Journal of High Energy Physics 2021-10-01

We report the first measurement of forward-backward asymmetry and ratios Wilson coefficients A9/A7 A10/A7 in B→K∗ℓ+ℓ−, where ℓ represents an electron or a muon. find evidence for with significance 3.4σ. The results are obtained from data sample containing 386×106 B¯¯¯B pairs that were collected on Υ(4S) resonance Belle detector at KEKB asymmetric-energy e+e− collider.Received 8 March 2006DOI:https://doi.org/10.1103/PhysRevLett.96.251801©2006 American Physical Society

10.1103/physrevlett.96.251801 article EN Physical Review Letters 2006-06-26

The suppressed decay chain B(-)→DK(-), D→K(+)π(-), where D indicates a D(¯)(0) or D(0) state, provides important information on the CP-violating angle ϕ(3). We measure ratio R(DK) of rates to favored mode D→K(-)π(+) be R(DK)=[1.63(-0.41)(+0.44)(stat)(-0.13)(+0.07)(syst)]×10(-2), which first evidence signal with significance 4.1σ. also asymmetry A(DK) between charge-conjugate decays A(DK)=-0.39(-0.28)(+0.26)(stat)(-0.03)(+0.04)(syst). results are based full 772×10(6) BB(¯) pair data sample...

10.1103/physrevlett.106.231803 article EN publisher-specific-oa Physical Review Letters 2011-06-10

We report the first observation of double strange baryon Ξ(1620)^{0} in its decay to Ξ^{-}π^{+} via Ξ_{c}^{+}→Ξ^{-}π^{+}π^{+} decays based on a 980 fb^{-1} data sample collected with Belle detector at KEKB asymmetric-energy e^{+}e^{-} collider. The mass and width are measured be 1610.4±6.0(stat)_{-4.2}^{+6.1} (syst) MeV/c^{2} 59.9±4.8(stat)_{-7.1}^{+2.8}(syst) MeV, respectively. obtain 4.0σ evidence Ξ(1690)^{0} same sample. These results shed light structure hyperon resonances strangeness S=-2.

10.1103/physrevlett.122.072501 article EN cc-by Physical Review Letters 2019-02-21

Using data samples of 89.5 and $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ recorded at energies $\sqrt{s}=10.52$ 10.58 GeV, respectively, with the Belle detector KEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider, we report measurements branching fractions semileptonic decays ${\mathrm{\ensuremath{\Xi}}}_{c}^{0}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Xi}}}^{\ensuremath{-}}{\ensuremath{\ell}}^{+}{\ensuremath{\nu}}_{\ensuremath{\ell}}$ ($\ensuremath{\ell}=e$ or $\ensuremath{\mu}$)...

10.1103/physrevlett.127.121803 article EN cc-by Physical Review Letters 2021-09-17

Abstract The varying influence of the environment on N supply and demand dictates need for annually updated fertilizer recommendations. Currently, crop yield goal (CYG) methods are used by 34 land grant universities, including Mississippi State University, these do not consider environmental variations. This research tested efficacy CYG determining agronomic optimum rate (AONR) economic corn ( Zea mays L.) production. In total, 12 treatments in 2020 11 2021 were replicated four times over...

10.1002/agj2.21179 article EN cc-by Agronomy Journal 2022-11-30

We present the first observation of ${\mathrm{\ensuremath{\Omega}}}_{c}^{0}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Omega}}}^{\ensuremath{-}}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}}$ decay and measurements branching fraction ratios ${\mathrm{\ensuremath{\Omega}}}_{c}^{0}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Omega}}}^{\ensuremath{-}}{\ensuremath{\ell}}^{+}{\ensuremath{\nu}}_{\ensuremath{\ell}}$ decays compared to reference mode...

10.1103/physrevd.105.l091101 article EN cc-by Physical review. D/Physical review. D. 2022-05-16
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