A5055832436- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Advanced Data Storage Technologies
- Particle accelerators and beam dynamics
- Radiation Therapy and Dosimetry
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Cosmology and Gravitation Theories
- Numerical methods for differential equations
- Impact of Light on Environment and Health
- Lanthanide and Transition Metal Complexes
- Optical Systems and Laser Technology
- Radiation Effects and Dosimetry
- Stochastic processes and statistical mechanics
- Face and Expression Recognition
Chip Design Systems (United States)
2024
St. Francis Xavier University
2018-2022
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
2018
University of the Basque Country
2018
Laboratoire d’Annecy de Physique des Particules
2018
Institut National de Physique Nucléaire et de Physique des Particules
2018
Centre National de la Recherche Scientifique
2018
Universitat de Barcelona
2018
Jazan University
2015-2017
University of Victoria
2011-2014
The ATLAS detector as installed in its experimental cavern at point 1 CERN is described this paper. A brief overview of the expected performance when Large Hadron Collider begins operation also presented.
The simulation software for the ATLAS Experiment at Large Hadron Collider is being used large-scale production of events on LHC Computing Grid. This requires many components, from generators that simulate particle collisions, through packages simulating response various detectors and triggers. All these components come together under infrastructure. In this paper, infrastructure discussed, including supporting detector description, interfacing event generation, combining GEANT4 individual...
We search for the rare decay <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msup><a:mi>B</a:mi><a:mo>+</a:mo></a:msup><a:mo stretchy="false">→</a:mo><a:msup><a:mi>K</a:mi><a:mo>+</a:mo></a:msup><a:mi>ν</a:mi><a:mover accent="true"><a:mi>ν</a:mi><a:mo stretchy="false">¯</a:mo></a:mover></a:math> in a <f:math xmlns:f="http://www.w3.org/1998/Math/MathML" display="inline"><f:mn>362</f:mn><f:mtext> </f:mtext><f:mtext>...
Jet cross sections have been measured for the first time in proton-proton collisions at a centre-of-mass energy of 7 TeV using ATLAS detector. The measurement uses an integrated luminosity 17 nb-1 recorded Large Hadron Collider. anti-kt algorithm is used to identify jets, with two jet resolution parameters, R = 0.4 and 0.6. dominant uncertainty comes from scale, which determined within 7% central jets above 60 GeV transverse momentum. Inclusive single-jet differential are presented as...
A search for new heavy particles manifested as resonances in two-jet final states is presented. The data were produced 7 TeV proton-proton collisions by the LHC and correspond to an integrated luminosity of $315\text{ }\text{ }{\mathrm{nb}}^{\ensuremath{-}1}$ collected ATLAS detector. No observed. Upper limits set on product cross section signal acceptance excited-quark (${q}^{*}$) production a function ${q}^{*}$ mass. These exclude at 95% C.L. mass interval $0.30<{m}_{{q}^{*}}<1.26\text{...
Measurements of charged particle distributions, sensitive to the underlying event, have been performed with ATLAS detector at LHC. The measurements are based on data collected using a minimum-bias trigger select proton-proton collisions center-of-mass energies 900 GeV and 7 TeV. "underlying event" is defined as those aspects hadronic interaction attributed not hard scattering process, but rather accompanying interactions rest proton. Three regions in azimuthal angle respect highest-pt such...
Abstract A series of data samples was collected with the Belle II detector at SuperKEKB collider from March 2019 to June 2022. We determine integrated luminosities these using three distinct methodologies involving Bhabha ( ), digamma and dimuon ) events. The total luminosity obtained Bhabha, digamma, events is (426.88 ± 0.03 2.61) fb −1 , (429.28 2.62) (423.99 0.04 3.83) where first uncertainties are statistical second systematic. resulting combination methods (427.87 2.01) .
We measure the time-integrated <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>C</a:mi><a:mi>P</a:mi></a:math> asymmetry in <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>D</c:mi><c:mn>0</c:mn></c:msup><c:mo stretchy="false">→</c:mo><c:msubsup><c:mi>K</c:mi><c:mi>S</c:mi><c:mn>0</c:mn></c:msubsup><c:msubsup><c:mi>K</c:mi><c:mi>S</c:mi><c:mn>0</c:mn></c:msubsup></c:math> decays reconstructed <f:math...
We measure the branching fraction of decay <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msup><a:mrow><a:mi>B</a:mi></a:mrow><a:mrow><a:mn>0</a:mn></a:mrow></a:msup><a:mo stretchy="false">→</a:mo><a:mi>J</a:mi><a:mo>/</a:mo><a:mi>ψ</a:mi><a:mi>ω</a:mi></a:mrow></a:math> using data collected with Belle II detector at SuperKEKB collider. The contain <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:mrow><d:mo...
Dijet angular distributions from the first LHC pp collisions at center-of-mass energy s=7TeV have been measured with ATLAS detector. The dataset used for this analysis represents an integrated luminosity of 3.1pb−1. χ and centrality ratios up to dijet masses 2.8 TeV, found be in good agreement Standard Model predictions. Analysis excludes quark contact interactions a compositeness scale Λ below 3.4 95% confidence level, significantly exceeding previous limits.
We study the processes e^{+}e^{-}→ωχ_{bJ}(1P) (J=0, 1, or 2) using samples at center-of-mass energies sqrt[s]=10.701, 10.745, and 10.805 GeV, corresponding to 1.6, 9.8, 4.7 fb^{-1} of integrated luminosity, respectively. These data were collected with Belle II detector during special operations SuperKEKB collider above ϒ(4S) resonance. report first observation ωχ_{bJ}(1P) signals sqrt[s]=10.745 GeV. By combining results sqrt[s]=10.867 we find energy dependencies Born cross sections for...
We present the first measurement of ratio branching fractions inclusive semileptonic B-meson decays, R(X_{e/μ})=B(B→Xeν)/B(B→Xμν), a precision test electron-muon universality, using data corresponding to 189 fb^{-1} from electron-positron collisions collected with Belle II detector. In events where partner B meson is fully reconstructed, we use fits lepton momentum spectra above 1.3 GeV/c obtain R(X_{e/μ})=1.007±0.009(stat)±0.019(syst), which most precise lepton-universality its kind and...
We search for lepton-flavor-violating τ^{-}→e^{-}α and τ^{-}→μ^{-}α decays, where α is an invisible spin-0 boson. The uses electron-positron collisions at 10.58 GeV center-of-mass energy with integrated luminosity of 62.8 fb^{-1}, produced by the SuperKEKB collider collected Belle II detector. excess in lepton-energy spectrum known τ^{-}→e^{-}ν[over ¯]_{e}ν_{τ} τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ} decays. report 95% confidence-level upper limits on branching-fraction ratio...
The $L_{\mu}-L_{\tau}$ extension of the standard model predicts existence a lepton-flavor-universality-violating $Z^{\prime}$ boson that couples only to heavier lepton families. We search for such $Z^\prime$ through its invisible decay in process $e^+ e^- \to \mu^+ \mu^- Z^{\prime}$. use sample electron-positron collisions at center-of-mass energy 10.58GeV collected by Belle II experiment 2019-2020, corresponding an integrated luminosity 79.7fb$^{-1}$. find no excess over expected...
We present a measurement of the τ-lepton mass using sample about 175 million e+e−→τ+τ− events collected with Belle II detector at SuperKEKB e+e− collider center-of-mass energy 10.579 GeV. This corresponds to an integrated luminosity 190 fb−1. use kinematic edge τ pseudomass distribution in decay τ−→π−π+π−ντ and measure be 1777.09±0.08±0.11 MeV/c2, where first uncertainty is statistical second systematic. result most precise date.Received 31 May 2023Accepted 13 July...
We determine the Cabibbo-Kobayashi-Maskawa matrix-element magnitude |Vcb| using B¯0→D*+ℓ−ν¯ℓ decays reconstructed in 189 fb−1 of collision data collected by Belle II experiment, located at SuperKEKB e+e− collider. Partial decay rates are reported as functions recoil parameter w and three angles separately for electron muon final states. obtain Boyd-Grinstein-Lebed Caprini-Lellouch-Neubert parametrizations, find |Vcb|BGL=(40.57±0.31±0.95±0.58)×10−3 |Vcb|CLN=(40.13±0.27±0.93±0.58)×10−3 with...
We measure the tau-to-light-lepton ratio of inclusive <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>B</a:mi></a:math>-meson branching fractions <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mrow><c:mrow><c:mi>R</c:mi><c:mo stretchy="false">(</c:mo><c:msub><c:mrow><c:mi>X</c:mi></c:mrow><c:mrow><c:mi>τ</c:mi><c:mo>/</c:mo><c:mo>ℓ</c:mo></c:mrow></c:msub><c:mo stretchy="false">)</c:mo></c:mrow><c:mo>≡</c:mo><c:mspace...
We report measurements of time-dependent <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>C</a:mi><a:mi>P</a:mi></a:mrow></a:math> asymmetries in <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>B</c:mi><c:mn>0</c:mn></c:msup><c:mo stretchy="false">→</c:mo><c:msubsup><c:mi>K</c:mi><c:mi>S</c:mi><c:mn>0</c:mn></c:msubsup><c:msup><c:mi>π</c:mi><c:mn>0</c:mn></c:msup><c:mi>γ</c:mi></c:math> decays based on a data sample...
We present a measurement of the branching fraction and time-dependent charge-parity (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>C</a:mi><a:mi>P</a:mi></a:math>) decay-rate asymmetries in <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>B</c:mi><c:mn>0</c:mn></c:msup><c:mo stretchy="false">→</c:mo><c:mrow><c:mi>J</c:mi><c:mo>/</c:mo><c:mi>ψ</c:mi></c:mrow><c:msup><c:mi>π</c:mi><c:mn>0</c:mn></c:msup></c:math> decays. The data...
We present measurements of the first to fourth moments lepton mass squared q2 B→Xcℓ¯νℓ decays for ℓ=e, μ and with Xc a hadronic system containing charm quark. These results use sample electron-positron collisions at Υ(4S) resonance corresponding 62.8 fb−1 integrated luminosity collected by Belle II 2 experiment in 2019 2020. To identify reconstruct q2, one B mesons from an Υ(4S)→B¯B decay is fully reconstructed mode using multivariate tagging algorithm. report raw central q2>1.5 GeV2/c4 up...
The ratio of branching fractions $R(D^{*}) = \mathcal{B}(\overline{B} \rightarrow D^{*} \tau^{-} \overline{\nu}_{\tau})$/$\mathcal{B} (\overline{B} \ell^{-} \overline{\nu}_{\ell})$, where $\ell$ is an electron or muon, measured using a Belle~II data sample with integrated luminosity $189~\mathrm{fb}^{-1}$ at the SuperKEKB asymmetric-energy $e^{+} e^{-}$ collider. Data collected $\Upsilon(\mathrm{4S})$ resonance, and one $B$ meson in $\Upsilon(\mathrm{4S})\rightarrow B\overline{B}$ decay...
We report on a measurement of the $\Omega_c^0$ lifetime using $\Omega_c^0 \to \Omega^-\pi^+$ decays reconstructed in $e^+e^-\to c\bar{c}$ data collected by Belle II experiment and corresponding to $207~{\rm fb^{-1}}$ integrated luminosity. The result, $\rm\tau(\Omega_c^0)=243\pm48( stat)\pm11(syst)~fs$, agrees with recent measurements indicating that is not shortest-lived weakly decaying charmed baryon.
We search for the rare decay $B^{+}\rightarrow K^{+}ν\barν$ in a $362\ \rm{fb}^{-1}$ sample of electron-positron collisions at $Υ(4S)$ resonance collected with Belle II detector SuperKEKB collider. use inclusive properties accompanying $B$ meson $Υ(4S) \to B\kern 0.18em\overline{\kern -0.18em B}{}$ events to suppress background from other decays signal candidate and light-quark pair production. validate measurement an auxiliary analysis based on conventional hadronic reconstruction meson....
We report measurements of $\sin{2\beta}$ and $\cos{2\beta}$ from a time-dependent Dalitz plot analysis $B^{0} \to D^{(*)} h^{0}$ with $D K_{S}^{0} \pi^{+} \pi^{-}$ decays, where the light unflavored neutral hadron $h^{0}$ is $\pi^{0}$, $\eta$, or $\omega$ meson. The performed combination final data sets \babar\ Belle experiments containing $471 \times 10^{6}$ $772 $B\bar{B}$ pairs collected at $\Upsilon\left(4S\right)$ resonance asymmetric-energy B factories PEP-II SLAC KEKB KEK,...