A5066014577- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Magnetic confinement fusion research
- International Science and Diplomacy
- Superconducting Materials and Applications
- Distributed and Parallel Computing Systems
- Plasma Diagnostics and Applications
- Advanced X-ray Imaging Techniques
- Gyrotron and Vacuum Electronics Research
- Computational Physics and Python Applications
- Laser-Plasma Interactions and Diagnostics
- Twentieth Century Scientific Developments
- Atomic and Molecular Physics
- Advanced Data Storage Technologies
- Neutrino Physics Research
- Advances in Oncology and Radiotherapy
- Photocathodes and Microchannel Plates
- Dark Matter and Cosmic Phenomena
- Electrostatic Discharge in Electronics
- Advanced Surface Polishing Techniques
- Astrophysics and Cosmic Phenomena
Deutsches Elektronen-Synchrotron DESY
2007-2023
European Organization for Nuclear Research
2018-2020
University College London
2016
SLAC National Accelerator Laboratory
1984-2011
Fermi National Accelerator Laboratory
2011
Institute of High Energy Physics
2011
Institut National de Physique Nucléaire et de Physique des Particules
2011
Centre National de la Recherche Scientifique
2011
Brookhaven National Laboratory
2011
High Energy Accelerator Research Organization
2011
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...
The first measurement of lepton-jet momentum imbalance and azimuthal correlation in lepton-proton scattering at high transfer is presented. These data, taken with the H1 detector HERA, are corrected for effects using an unbinned machine learning algorithm (multifold), which considers eight observables simultaneously this application. unfolded cross sections compared calculations performed within context collinear or transverse-momentum-dependent factorization quantum chromodynamics as well...
A first measurement is reported of the longitudinal proton structure function F_L(x,Q^2) at ep collider HERA. It based on inclusive deep inelastic e^+p scattering cross section measurements with a positron beam energy 27.5 GeV and energies 920, 575 460 GeV. Employing dependence section, F_L measured in range squared four-momentum transfers 12 < Q^2 90 GeV^2 low Bjorken x 0.00024 0.0036. The values agree higher order QCD calculations parton densities obtained using data previously
Measurements of open charm and beauty production cross sections in deep inelastic ep scattering at HERA from the H1 ZEUS Collaborations are combined. Reduced obtained kinematic range negative four-momentum transfer squared photon $$2.5~\hbox {GeV}^2\le Q^2 \le 2000\, \hbox {GeV}^2$$ Bjorken scaling variable $$3 \cdot 10^{-5} x_\mathrm{Bj} 5 10^{-2}$$ . The combination method accounts for correlations statistical systematic uncertainties among different datasets. Perturbative QCD calculations...
Abstract The HERAPDF2.0 ensemble of parton distribution functions (PDFs) was introduced in 2015. final stage is presented, a next-to-next-to-leading-order (NNLO) analysis the HERA data on inclusive deep inelastic ep scattering together with jet as published by H1 and ZEUS collaborations. A perturbative QCD fit, simultaneously $$\alpha _s(M_Z^2)$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>α</mml:mi> <mml:mi>s</mml:mi> </mml:msub>...
The radiation pattern within high energy quark- and gluon-initiated jets (jet substructure) is used extensively as a precision probe of the strong force well an environment for optimizing event generators with numerous applications in particle nuclear physics. Looking at electron-proton collisions particular interest many complications present hadron colliders are absent. A detailed study modern jet substructure observables, angularities, presented using data recorded H1 detector HERA....
The inclusive production of D*(2010) mesons in deep-inelastic ep scattering is measured the kinematic region photon virtuality 100 < Q^2 1000 GeV^2 and inelasticity 0.02 y 0.7. Single double differential cross sections for D* meson are visible range defined by |eta(D*)| 1.5 p_T(D*) > GeV. data were collected H1 experiment during period from 2004 to 2007 correspond an integrated luminosity 351 pb^{-1}. charm contribution, F_2^{ccbar}, proton structure function F_2 determined. measurements...
We report a measurement of the branching ratios for two decay modes τ lepton: RB(τ±→K±K∓π±ντ)=(0.22−0.11+0.17)% and RB(τ±→K±π∓π±(π0)ντ)=(0.22−0.13+0.16)%. The separation these channels is accomplished in DELCO detector by use gas Čerenkov counter to identify fast kaons. invariant-mass distribution K±K∓π± system has been used set an upper bound on neutrino mass 157 MeV at 95% confidence limit.Received 13 November 1984DOI:https://doi.org/10.1103/PhysRevLett.54.624©1985 American Physical Society
The H1 Collaboration reports the first measurement of 1-jettiness event shape observable $\tau_1^b$ in neutral-current deep-inelastic electron-proton scattering (DIS). is equivalent to a thrust defined Breit frame. data sample was collected at HERA $ep$ collider years 2003-2007 with center-of-mass energy $\sqrt{s}=319\,\text{GeV}$, corresponding an integrated luminosity $351.1\,\text{pb}^{-1}$. Triple differential cross sections are provided as function $\tau_1^b$, virtuality $Q^2$, and...
The H1 Collaboration at HERA reports the first measurement of groomed event shape observables in deep inelastic electron-proton scattering (DIS) $\sqrt{s}=319$ GeV, using data recorded between years 2003 and 2007 with an integrated luminosity $351$ pb$^{-1}$. Event shapes provide incisive probes perturbative non-perturbative QCD. Grooming techniques have been used for jet measurements hadronic collisions; this paper presents application grooming to DIS data. analysis is carried out Breit...
ATF2 is a final-focus test beam line which aims to focus the low emittance from ATF damping ring vertical size of about 37 nm and demonstrate nanometer level stability. Several advanced diagnostics feedback tools are used. In December 2008, construction installation were completed commissioning started, supported by an international team Asian, European, U.S. scientists. The present status first results described.
Combined HERA data on charm production in deep-inelastic scattering have previously been used to determine the charm-quark running mass $m_c(m_c)$ MSbar renormalisation scheme. Here, same are as a function of photon virtuality $Q^2$ evaluate at different scales one-loop order, context next-to-leading order QCD analysis. The scale dependence is found be consistent with expectations.
Abstract Exclusive photoproduction of $${{\rho ^0}} (770)$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi>ρ</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo>(</mml:mo> <mml:mn>770</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> </mml:math> mesons is studied using the H1 detector at ep collider HERA. A sample about 900,000 events used to measure single- and double-differential cross sections for reaction $$\gamma p \rightarrow \pi ^{+}\pi ^{-}Y$$...
The production of isolated photons in deep-inelastic scattering $ep\to e \gamma X$ is measured with the H1 detector at HERA. measurement performed kinematic range negative four-momentum transfer squared $4<Q^2<150 $~GeV$^2$ and a mass hadronic system $W_X>50$ GeV. analysis based on total integrated luminosity 227~pb$^{-1}$. cross section isolatedphotons transverse energy $3 < E_T^\gamma 10$ GeV pseudorapidity $-1.2 \eta^\gamma 1.8$ as function $E_T^\gamma$, $\eta^\gamma$ $Q^2$. Isolated...
The parameters of the electroweak theory are determined in a combined and QCD analysis using all deep-inelastic $$e^+p$$ $$e^-p$$ neutral current charged scattering cross sections published by H1 Collaboration, including data with longitudinally polarised lepton beams. Various fits to Standard Model on-shell scheme performed. mass W boson is as $$m_W=80.520\pm 0.115~\mathrm {GeV} $$ . axial-vector vector couplings light quarks Z also determined. Both results improve precision previous...
Processes leading to a final state with at least two high transverse momentum leptons (electrons or muons) are studied using the full e±p data sample collected by H1 experiment HERA. The correspond an integrated luminosity of 463 pb−1. Di-lepton and tri-lepton event classes investigated. Cross sections production e+e− μ+μ− pairs derived in restricted phase space dominated photon–photon collisions. In general, good agreement is found Standard Model predictions. Events observed total scalar...