G. Chlachidze
A5028085764- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Computational Physics and Python Applications
- Medical Imaging Techniques and Applications
- Black Holes and Theoretical Physics
- Radiation Detection and Scintillator Technologies
- Superconductivity in MgB2 and Alloys
- Spacecraft and Cryogenic Technologies
- Astrophysics and Cosmic Phenomena
- Magnetic confinement fusion research
- Atomic and Subatomic Physics Research
- Distributed and Parallel Computing Systems
- Physics of Superconductivity and Magnetism
- HVDC Systems and Fault Protection
- Nuclear physics research studies
- Parallel Computing and Optimization Techniques
- CCD and CMOS Imaging Sensors
Fermi National Accelerator Laboratory
2015-2024
Fermi Research Alliance
2002-2023
High Energy Accelerator Research Organization
2017
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2014
European Organization for Nuclear Research
2014
Lawrence Berkeley National Laboratory
2000-2012
Institute of Physics, Academia Sinica
2011
National and Kapodistrian University of Athens
2011
Argonne National Laboratory
2011
Texas A&M University
2009-2011
We present a new measurement of the inclusive and differential production cross sections $J/\ensuremath{\psi}$ mesons $b$ hadrons in proton-antiproton collisions at $\sqrt{s}=1960\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$. The data correspond to an integrated luminosity $39.7\text{ }{\mathrm{p}\mathrm{b}}^{\ensuremath{-}1}$ collected by CDF run II detector. find section for all transverse momenta from 0 $20\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/c$ rapidity range $|y|<0.6$ be...
The mass of the W boson, a mediator weak force between elementary particles, is tightly constrained by symmetries standard model particle physics. Higgs boson was last missing component model. After observation measurement provides stringent test We measure mass, MW, using data corresponding to 8.8 inverse femtobarns integrated luminosity collected in proton-antiproton collisions at 1.96 tera-electron volt center-of-mass energy with CDF II detector Fermilab Tevatron collider. A sample...
We present a new measurement of the inclusive forward-backward $t\overline{t}$ production asymmetry and its rapidity mass dependence. The measurements are performed with data corresponding to an integrated luminosity $5.3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\mathrm{TeV}$, recorded CDF-II Detector Fermilab Tevatron. Significant asymmetries observed in both laboratory frame rest frame, cases found be consistent $CP$ conservation...
We report the observation of ${B}_{s}^{0}\mathrm{\text{\ensuremath{-}}}{\overline{B}}_{s}^{0}$ oscillations from a time-dependent measurement oscillation frequency $\ensuremath{\Delta}{m}_{s}$. Using data sample $1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\mathrm{TeV}$ collected with CDF II detector Fermilab Tevatron, we find signals 5600 fully reconstructed hadronic ${B}_{s}$ decays, 3100 partially and 61 500 semileptonic decays....
We report the first observation of single top quark production using 3.2 fb^-1 pbar p collision data with sqrt{s}=1.96 TeV collected by Collider Detector at Fermilab. The significance observed is 5.0 standard deviations, and expected sensitivity for model decay in excess 5.9 deviations. Assuming m_t=175 GeV/c^2, we measure a cross section 2.3 +0.6 -0.5 (stat+syst) pb, extract CKM matrix element value |V_{tb}|=0.91 +-0.11 0.07(theory), set limit |V_{tb}|>0.71 95% C.L.
Evidence is reported for a narrow structure near the J/psivarphi threshold in exclusive B;{+} --> J/psivarphiK;{+} decays produced p[over]p collisions at sqrt[s] = 1.96 TeV. A signal of 14 +/- 5 events, with statistical significance excess 3.8 standard deviations, observed data sample corresponding to an integrated luminosity 2.7 fb;{-1}, collected by CDF II detector. The mass and natural width are measured be 4143.0 2.9(stat) 1.2(syst) MeV/c;{2} 11.7_{-5.0};{+8.3}(stat) 3.7(syst) MeV/c;{2}.
We present a measurement of the $t\overline{t}$ production cross section using events with one charged lepton and jets from $p\overline{p}$ collisions at center-of-mass energy 1.96 TeV. In these events, heavy flavor quarks top quark decay are identified secondary vertex tagging algorithm. From $162\text{ }\text{ }\mathrm{p}{\mathrm{b}}^{\ensuremath{-}1}$ data collected by Collider Detector Fermilab, total 48 candidate selected, where $13.5\ifmmode\pm\else\textpm\fi{}1.8$ expected background...
We present an analysis of angular distributions and correlations the X(3872) particle in exclusive decay mode X(3872)->J/psi pi+ pi- with J/psi->mu+ mu-. use 780 pb -1 data from ppbar collisions at sqrt{s} = 1.96 TeV collected CDF II detector Fermilab Tevatron. derive constraints on spin, parity, charge conjugation parity by comparing measured products predictions for different JPC hypotheses. The assignments 1++ 2-+ are only ones consistent data.
This Letter describes the first determination of bounds on $CP$-violation parameter $2{\ensuremath{\beta}}_{s}$ using ${B}_{s}^{0}$ decays in which flavor bottom meson at production is identified. The result based approximately 2000 ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\phi}$ reconstructed a $1.35\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected with CDF II detector $p\overline{p}$ collisions produced Fermilab Tevatron. We report confidence...
We report the first measurements of inclusive W and Z boson cross sections times corresponding leptonic branching ratios for p pbar collisions at sqrt{s} = 1.96 TeV based on decays bosons into electrons muons. The data were recorded with CDF II detector Fermilab Tevatron correspond to an integrated luminosity 72.0 +/- 4.3 pb-1. test e-mu lepton universality in by measuring ratio W->mu nu W->e determine a value 0.991 0.004(stat.) 0.011(syst.) W-l-nu couplings (g_mu/g_e). Since there is no...
We present measurements of the forward-backward charge asymmetry in top pair production using 1.9 fb;{-1} pp[over ] collisions at sqrt[s]=1.96 TeV recorded with Collider Detector Fermilab II. Correcting for acceptance and measurement dilutions we obtain parton-level asymmetries A_{FB};{pp[over ]}=0.17+/-0.08 frame A_{FB};{tt[over ]}=0.24+/-0.14 tt[over frame. The values are consistent standard model expectation disfavor exotic mechanisms significant negative values.
We report on measurements of differential cross sections dsigma/dp(T) for prompt charm meson production in ppmacr; collisions at sqrt[s]=1.96 TeV using 5.8+/-0.3 pb(-1) data from the CDF II detector Fermilab Tevatron. The are collected with a new trigger that is sensitive to long lifetime hadrons containing heavy flavor. measured central rapidity region |y|</=1 four fully reconstructed decay modes: D0-->K-pi(+), D(*+)-->D0pi(+), D+-->K-pi(+)pi(+), D(+)(s)-->phipi(+), and their charge...
We have measured the polarizations of $J/\ensuremath{\psi}$ and $\ensuremath{\psi}(2S)$ mesons as functions their transverse momentum ${p}_{T}$ when they are produced promptly in rapidity range $|y|<0.6$ with ${p}_{T}\ensuremath{\ge}5\text{ }\text{ }\mathrm{GeV}/c$. The analysis is performed using a data sample an integrated luminosity about $800\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ collected by CDF II detector. For both vector mesons, we find that become increasingly longitudinal...
We have measured the polarization of J/psi and psi(2S) mesons produced in pp collisions at sqrt[s] = 1.8 TeV, using data collected Collider Detector Fermilab during 1992-1995. The promptly [psi(2S)] is isolated from those B-hadron decay, over kinematic range 4 [5.5]<P(T)<20 GeV/c |y|<0.6. For P(T) greater than or approximately equal 12 we do not observe significant prompt component.
The growth and development of ``charged particle jets'' produced in proton-antiproton collisions at $1.8 \mathrm{TeV} $ are studied over a transverse momentum range from $0.5$ $\mathrm{GeV}/c$ to $50$ $\mathrm{GeV}/c.$ A variety leading (highest momentum) charged jet observables compared with the QCD Monte Carlo models HERWIG, ISAJET, PYTHIA. describe fairly well multiplicity distribution particles within jet, size radial around direction, jet. direction jet'' each event is used define three...
We present new measurements of the inclusive forward-backward ttbar production asymmetry, AFB, and its dependence on several properties system. The are performed with full Tevatron data set recorded CDF II detector during ppbar collisions at sqrt(s) = 1.96 TeV, corresponding to an integrated luminosity 9.4 fb^(-1). measure asymmetry using rapidity difference Delta-y=y_(t)-y_(tbar). Parton-level results derived, yielding 0.164+/-0.047 (stat + syst). observe a linear AFB top-quark pair mass...
We present a measurement of the inclusive jet cross section in $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$ based on data collected by CDF II detector with an integrated luminosity $1.13\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. The was made using cone-based midpoint clustering algorithm rapidity region $|y|<2.1$. results are consistent next-to-leading-order perturbative QCD predictions recent parton distribution functions (PDFs), and expected to provide increased...
We present the first measurement of Bs-Bsbar oscillation frequency Delta m_s. use 1 fb^-1 data from p-pbar collisions at sqrt{s}=1.96 TeV collected with CDF II detector Fermilab Tevatron. The sample contains signals 3,600 fully reconstructed hadronic Bs decays and 37,000 partially semileptonic decays. measure probability as a function proper decay time that same, or opposite, flavor production, we find signal consistent oscillations. random fluctuations could produce comparable is 0.2%....
In CDF we have observed the reactions p + p[over] --> X p[over], with being a centrally produced J/psi, psi(2S), or chi_{c0}, and gammagamma-->micro;{+}micro;{-} in pp[over] collisions at sqrt[s] = 1.96 TeV. The event signature requires two oppositely charged central muons, either no other particles one additional photon detected. Exclusive vector meson production is as expected for elastic photoproduction, gamma J/psi(psi(2S)) p, here first time hadron-hadron collisions. We also observe...
We reconstruct the decays B -> K(*) mu+ mu- and measure their angular distributions in ppbar collisions at sqrt{s}=1.96TeV using a data sample corresponding to an integrated luminosity of 6.8fb-1. The transverse polarization asymmetry AT(2) time-reversal-odd charge-and-parity Aim are measured for first time, together with K* longitudinal fraction FL muon forward-backward AFB, B0 K*0 B+ K*+ mu-. Our results among most accurate date consistent those from other experiments.
We report the first observation of baryonic flavor-changing neutral current decay Λ(b)(0)→Λμ(+)μ(-) with 24 signal events and a statistical significance 5.8 Gaussian standard deviations. This measurement uses pp collisions data sample corresponding to 6.8 fb(-1) at √s = 1.96 TeV collected by CDF II detector Tevatron collider. The total differential branching ratios for are measured. find B(Λ(b)(0)→Λμ(+)μ(-))=[1.73 ± 0.42(stat) (syst)] × 10(-6). also ratio B(s)(0)→ϕμ(+)μ(-), using 49 events....
We report a study of the invariant mass distribution jet pairs produced in association with W boson using data collected CDF detector which correspond to an integrated luminosity 4.3 fb(-1). The observed has excess 120-160 GeV/c(2) range is not described by current theoretical predictions within statistical and systematic uncertainties. In this Letter, we studies properties excess.
We have measured the $W$-boson mass ${M}_{W}$ using data corresponding to $2.2\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of integrated luminosity collected in $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\mathrm{TeV}$ with CDF II detector Fermilab Tevatron collider. Samples consisting 470 126 $W\ensuremath{\rightarrow}e\ensuremath{\nu}$ candidates and 624 708 $W\ensuremath{\rightarrow}\ensuremath{\mu}\ensuremath{\nu}$ yield measurement ${M}_{W}=80\text{...
The High Luminosity (HiLumi) Large Hadron Collider (LHC) project has, as the main objective, to increase LHC peak luminosity by a factor five and integrated ten. This goal will be achieved mainly with new interaction region layout, which allow stronger focusing of colliding beams. target reduce beam size in points two, requires doubling aperture low- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math...
The observation of the $Y(4140)$ structure in $B^\pm\rightarrow J/\psi\,\phi K^\pm$ decays produced $\bar{p} p $ collisions at $\sqrt{s}=1.96~\TeV$ is reported with a statistical significance greater than 5 standard deviations. A fit to $J/\psi\,\phi$ mass spectrum performed assuming presence Breit-Wigner resonance. yields signal $19^{+6}_{-5}$ resonance events, and width $4143.4^{+2.9}_{-3.0}(\mathrm{stat})\pm0.6(\mathrm{syst})~\MeVcc$...