A5052263288- 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
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Advanced Data Storage Technologies
- Muon and positron interactions and applications
- advanced mathematical theories
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Big Data Technologies and Applications
- Particle accelerators and beam dynamics
- Scientific Computing and Data Management
- Digital Radiography and Breast Imaging
- International Science and Diplomacy
University of Cambridge
1985-2025
University of Göttingen
2014-2024
University of California, Santa Cruz
2017-2024
University of Wuppertal
2018-2024
University of Geneva
2023-2024
A. Alikhanyan National Laboratory
2024
SR Research (Canada)
2024
Federación Española de Enfermedades Raras
2024
Atlas Scientific (United States)
2024
Institute for High Energy Physics
2024
The physics programme and the design are described of a new collider for particle nuclear physics, Large Hadron Electron Collider (LHeC), in which newly built electron beam 60 GeV, up to possibly 140 energy collides with intense hadron beams LHC. Compared HERA, kinematic range covered is extended by factor twenty negative four-momentum squared, $Q^2$, inverse Bjorken $x$, while luminosity $10^{33}$ cm$^{-2}$s$^{-1}$ LHeC projected exceed integrated HERA two orders magnitude. devoted an...
A combination is presented of all inclusive deep inelastic cross sections previously published by the H1 and ZEUS collaborations at HERA for neutral charged current $$e^{\pm }p$$ scattering zero beam polarisation. The data were taken proton energies 920, 820, 575 460 GeV an electron energy 27.5 GeV. correspond to integrated luminosity about 1 fb $$^{-1}$$ span six orders magnitude in negative four-momentum-transfer squared, $$Q^2$$ , Bjorken x. correlations systematic uncertainties evaluated...
A combination is presented of the inclusive deep inelastic cross sections measured by H1 and ZEUS Collaborations in neutral charged current unpolarised ep scattering at HERA during period 1994-2000. The data span six orders magnitude negative four-momentum-transfer squared, Q^2, Bjorken x. method used takes correlations systematic uncertainties into account, resulting an improved accuracy. combined are sole input a NLO QCD analysis which determines new set parton distributions, HERAPDF1.0,...
We present a measurement of forward-backward asymmetry in top quark-antiquark production proton-antiproton collisions the final state containing lepton and at least four jets. Using dataset corresponding to an integrated luminosity $5.4\,\mathrm {fb}^{-1}$, collected by \DZ\ experiment Fermilab Tevatron Collider, we measure \ttbar\ be $(9.2 \pm 3.7)$% reconstruction level. When corrected for detector acceptance resolution, is found $(19.6 6.5)$%. also based on from quark decay, $(15.2...
We combine searches by the CDF and D0 Collaborations for associated production of a Higgs boson with $W$ or $Z$ subsequent decay to bottom-antibottom quark pair. The data, originating from Fermilab Tevatron $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$, correspond integrated luminosities up $9.7\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. are conducted mass in range $100--150\text{ }\mathrm{GeV}/{c}^{2}$. observe an excess events data compared background predictions,...
Measurements of open charm production cross sections in deep-inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced $\sigma_{\rm red}^{c\bar{c}}$ for obtained kinematic range photon virtuality 2.5≤Q 2≤2000 GeV2 Bjorken scaling variable 3⋅10−5≤x≤5⋅10−2. The combination method accounts correlations systematic uncertainties among different data sets. combined together with inclusive used as input a detailed NLO QCD analysis to study influence heavy flavour...
The top quark is the heaviest known elementary particle, with a mass about 40 times larger than of its isospin partner, bottom quark. It decays almost 100% time to $W$ boson and Using top-antitop pairs at Tevatron proton-antiproton collider, CDF D0 Collaborations have measured quark's in different final states for integrated luminosities up $5.8\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. This paper reports on combination these measurements that results more precise value any individual...
We report evidence of a narrow structure, $X(5568)$, in the decay sequence $X(5568) \rightarrow B_s^0 π^{\pm}$, $B_s^0 J/ψϕ$, $J/ψ\rightarrow μ^+ μ^-$, $ϕ\rightarrow K^+K^-$. This is for first instance hadronic state with valence quarks four different flavors. The mass and natural width this are measured to be $m = 5567.8 \pm 2.9 {\rm \thinspace (stat)} ^{+0.9}_{-1.9} (syst)}$ MeV/$c^2$ $Γ= 21.9 6.4 ^{+5.0}_{-2.5} (syst)} $ MeV/$c^2$. If B_s^* π^{\pm} γπ^{\pm}$ an unseen $γ$, $m(X(5568))$...
We combine searches by the CDF and D0 Collaborations for standard model Higgs boson with mass in range 90--200 GeV$/c^2$ produced gluon-gluon fusion, $WH$, $ZH$, $t{\bar{t}}H$, vector fusion processes, decaying $H\rightarrow b{\bar{b}}$, W^+W^-$, ZZ$, $H\rightarrow\tau^+\tau^-$, \gamma\gamma$ modes. The data correspond to integrated luminosities of up 10 fb$^{-1}$ were collected at Fermilab Tevatron $p{\bar{p}}$ collisions $\sqrt{s}=1.96$ TeV. are also interpreted context fermiophobic fourth...
A measurement is presented of the inclusive neutral current e\pm p scattering cross section using data collected by H1 experiment at HERA during years 2003 to 2007 with proton beam energies Ep 920, 575, and 460 GeV. The kinematic range covers low absolute four-momentum transfers squared, 1.5 GeV2 < Q2 120 GeV2, small values Bjorken x, 2.9 \cdot 10-5 x 0.01, extends high inelasticity up y = 0.85. structure function FL measured combining new results previously published 920 GeV 820...
We present an updated measurement of the anomalous like-sign dimuon charge asymmetry Aslb for semi-leptonic $b$-hadron decays in 9.0 fb^-1 p pbar collisions recorded with D0 detector at a center-of-mass energy sqrt{s} = 1.96 TeV Fermilab Tevatron collider. obtain (-0.787 +- 0.172(stat) 0.093 (syst))%. This result differs by 3.9 standard deviations from prediction model and provides evidence anomalously large CP violation neutral B decay. The dependence on muon impact parameter is consistent...
We present the results of a search for flavor changing neutral current decay B_s^0->mu^+mu^- using 6.1 fb^-1 ppbar collisions at sqrt(s) = 1.96 TeV collected by D0 experiment Fermilab Tevatron Collider. The observed number B_s^0 candidates is consistent with background expectations. resulting upper limit on branching fraction BR(B_s^0->mu^+mu^-) < 5.1 x 10^-8 95% C.L. This factor 2.4 better than that previous analysis and best to date.
We present a measurement of the W boson mass using data corresponding to 4.3fb^-1 integrated luminosity collected with D0 detector during Run II at Fermilab Tevatron p\bar{p} collider. With sample 1,677,394 -> e\nu candidate events, we measure M_W = 80.367 +/- 0.026 GeV. This result is combined an earlier determined independent sample, 1fb^-1 luminosity, yield 80.375 0.023
We report an updated measurement of the $CP$-violating phase, ${\ensuremath{\phi}}_{s}^{J/\ensuremath{\psi}\ensuremath{\phi}}$, and decay-width difference for two mass eigenstates, $\ensuremath{\Delta}{\ensuremath{\Gamma}}_{s}$, from flavor-tagged decay ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\phi}$. The data sample corresponds to integrated luminosity $8.0\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ accumulated with D0 detector using $p\overline{p}$ collisions...
We summarize and combine direct measurements of the mass $W$ boson in $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$ proton-antiproton collision data collected by CDF D0 experiments at Fermilab Tevatron Collider. Earlier from are combined with two latest, more precise measurements: a measurement electron muon channels using corresponding to $2.2\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ integrated luminosity, channel $4.3\text{ luminosity. The resulting average for is...
We combine six measurements of the inclusive top-quark pair (ttbar) production cross section (sigma_ttbar) from data collected with CDF and D0 detectors at Fermilab Tevatron proton anti-proton collisions sqrt{s} = 1.96 TeV. The correspond to integrated luminosities up 8.8 fb^{-1}. obtain a value sigma_ttbar 7.60 \pm 0.41 pb for mass m_t=172.5 GeV. contributions uncertainty are 0.20 statistical sources, 0.29 systematic 0.21 on luminosity. result is in good agreement standard model expectation...
A BSTRACT Inclusive e ± p single and double differential cross sections for neutral charged current deep inelastic scattering processes are measured with the H1 detector at HERA. The data were taken a centre-of-mass energy of $ \sqrt {s} = {319} GeV total integrated luminosity 333.7 pb −1 shared between two lepton beam charges longitudinal polarisation modes. in range negative four-momentum transfer squared, Q 2 , 60 50 000 Bjorken x 0 . 0008 65. measurements combined earlier published...
We investigate the decay ${B}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\phi}{K}^{+}$ in a search for $X(4140)$ state, narrow threshold resonance $J/\ensuremath{\psi}\ensuremath{\phi}$ system. The data sample corresponds to an integrated luminosity of $10.4\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\mathrm{TeV}$ collected by D0 experiment Fermilab Tevatron collider. observe mass peak with statistical significance 3.1...
We present a measurement of the forward–backward asymmetry in top quark–antiquark production using full Tevatron Run II data set collected by D0 experiment at Fermilab. The is performed lepton+jets final states new kinematic fitting algorithm for events with four or more jets and partial reconstruction only three jets. Corrected detector acceptance resolution effects, evaluated to be AFB=(10.6±3.0)%. Results are consistent standard model predictions which range from 5.0% 8.8%. also...
We present the observation of doubly-produced $J/\psi$ mesons with D0 detector at Fermilab in $p\bar{p}$ collisions $\sqrt{s}=1.96$ TeV. The production cross section for both singly and is measured using a sample an integrated luminosity 8.1fb$^{-1}$. For first time, double separated into contributions due to single parton scatterings. Using these measurements, we determine effective $\sigma_{eff}$, parameter characterizing spatial area parton-parton interactions related density inside nucleon.
Dark matter (DM) simplified models are by now commonly used the ATLAS and CMS Collaborations to interpret searches for missing transverse energy (ETmiss). The coherent use of these sharpened LHC DM search program, especially in presentation its results their comparison direct-detection (DD) indirect-detection (ID) experiments. However, community has been aware limitations models, particular lack theoretical consistency some them restricted phenomenology leading relevance only a small subset...
We describe an analysis comparing the $p\overline{p}$ elastic cross section as measured by D0 Collaboration at a center-of-mass energy of 1.96 TeV to that in $pp$ collisions TOTEM 2.76, 7, 8, and 13 using model-independent approach. The sections, extrapolated $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$, are compared with measurement region diffractive minimum second maximum section. two data sets disagree $3.4\ensuremath{\sigma}$ level thus provide evidence for $t$-channel exchange...