A5106526088- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Distributed and Parallel Computing Systems
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- advanced mathematical theories
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Scientific Computing and Data Management
- Advanced Data Storage Technologies
- Muon and positron interactions and applications
- Big Data Technologies and Applications
- Structural Analysis of Composite Materials
- CCD and CMOS Imaging Sensors
- Nuclear Physics and Applications
- Semiconductor materials and interfaces
University of Bonn
2016-2025
Fermi National Accelerator Laboratory
2024
University of Chicago
2024
European Organization for Nuclear Research
2012-2024
University of Geneva
2023-2024
Istanbul University
2023-2024
A. Alikhanyan National Laboratory
2024
Atlas Scientific (United States)
2024
The University of Adelaide
2018-2023
Boğaziçi University
2019-2023
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...
Next-to-leading-order QCD analyses of the ZEUS data on deep inelastic scattering together with fixed-target have been performed, from which gluon and quark densities proton value strong coupling constant αs(MZ) were extracted. The study includes a full treatment experimental systematic uncertainties including point-to-point correlations. resulting in parton density functions are presented. A combined fit for yields agreement world average. derived alone indicate importance HERA determining...
A small electromagnetic sampling calorimeter, installed in the ZEUS experiment 1995, significantly enhanced acceptance for very low x and Q^2 inelastic neutral current scattering, e^{+}p \to e^{+}X, at HERA. measurement of proton structure function F_2 total virtual photon-proton (\gamma^*p) cross-section is presented 0.11 \le Q^{2} 0.65 GeV^2 2 \times 10^{-6} 6 10^{-5}, corresponding to a range \gamma^{*}p c.m. energy 100 W 230 GeV. Comparisons with various models are also presented.
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...
The photoproduction reaction gamma p -> mu+ mu- has been studied in ep interactions using the ZEUS detector at HERA. data sample corresponds to an integrated luminosity of 43.2 pb^{-1}. Upsilon meson observed for first time. sum products elastic Upsilon(1S), Upsilon(2S), Upsilon(3S) cross sections with their respective branching ratios is determined be 13.3 +- 6.0(stat.)^{+2.7}_{-2.3}(syst.) pb a mean photon-proton centre mass energy 120 GeV. section above prediction perturbative QCD model.
This paper presents measurements of D∗± production in deep inelastic scattering from collisions between 27.5 GeV positrons and 820 protons. The data have been taken with the ZEUS detector at HERA. decay channel D∗+ → (D0 K−π+)π+ (+c.c) has used study. e+p cross section for inclusive 5 < Q2 100 GeV2> y 0.7 is 5.3 ± 1.0 0.8 nb kinematic region 1.3 pT(D∗±) 9.0 |η(D∗±)| 1.5. Differential sections as functions pT(D∗±), η(D∗±), W are compared next-to-leading order QCD calculations based on...
A search for single-top production, $ep \rightarrow etX$, has been performed with the ZEUS detector at HERA using data corresponding to an integrated luminosity of $0.37\fbi$. No evidence top production was found, consistent expectation from Standard Model. Limits were computed via flavour changing neutral current transitions. The result combined a previous yielding total 0.50fb-1. 95% credibility level upper limit 0.13 pb obtained cross section centre-of-mass energy $\sqrt{s}=315\gev$.
A bstract The production of D 0 , * + $ D_s^{+} and \Lambda_c^{+} charm hadrons their antiparticles in ep scattering at HERA has been studied with the ZEUS detector, using a total integrated luminosity 372 pb −1 . fractions quarks hadronising into particular hadron were derived. In addition, ratio neutral to charged -meson rates, fraction mesons produced vector state, stangeness-suppression factor have determined. measurements performed photoproduction regime. reconstructed range transverse...
A bstract The production of D *± mesons in deep inelastic ep scattering has been measured for exchanged photon virtualities 5 < Q 2 1000 GeV , using an integrated luminosity 363 pb −1 with the ZEUS detector at HERA. Differential cross sections have and compared to next-to-leading-order QCD calculations. cross-sections are used extract charm contribution proton structure functions, expressed terms reduced section, $ \sigma_{\mathrm{red}}^{{c\overline{c}}} . Theoretical calculations based...
The reduced cross sections for e+p deep inelastic scattering have been measured with the ZEUS detector at HERA three different center-of-mass energies, 318, 251 and 225 GeV. sections, double differentially in Bjorken x virtuality, Q2, were obtained region 0.13≤y≤0.75, where y denotes inelasticity 5≤Q2≤110 GeV2. proton structure functions F2 FL extracted from sections.2 MoreReceived 26 June 2014DOI:https://doi.org/10.1103/PhysRevD.90.072002© 2014 American Physical Society
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>...
In this paper we review the physics opportunities at linear $e^+e^-$ colliders with a special focus on high centre-of-mass energies and beam polarisation, take fresh look various accelerator technologies available or under development and, for first time, discuss how facility equipped technology mature today could be upgraded of tomorrow to reach much higher and/or luminosities. addition, will detectors alternative collider modes, as well beyond-collider experiments R\&D facilities part...
The production of beauty and charm quarks in ep interactions has been studied with the ZEUS detector at HERA for exchanged four-momentum squared 5 < Q 2 1000 GeV2 using an integrated luminosity 354 pb−1. content events least one jet have extracted invariant mass charged tracks associated secondary vertices decay-length significance these vertices. Differential cross sections as a function 2, Bjorken x, trans- verse energy pseudorapidity were measured compared next-to-leading-order QCD...
Two-particle azimuthal correlations have been measured in neutral current deep inelastic ep scattering with virtuality Q2> 5 GeV2 at a centre-of-mass energy $$ \sqrt{s} = 318 GeV recorded the ZEUS detector HERA. The of charged particles range laboratory pseudorapidity −1.5 < η 2.0 and transverse momentum 0.1 pT< 5.0 event multiplicities Nch up to six times larger than average 〈Nch〉 ≈ 5. two-particle terms angular observables cn{2} 〈〈cosnΔφ〉〉, where n is between 1 4 ∆φ relative angle two...
In 2008, a triple GEM detector prototype with an area of ∼ 2000 cm2 has been constructed, based on foils 66 × cm. GEMs such dimensions had not made before, and innovations to the existing technology were introduced build this detector. This paper discusses these presents further work large development. A single-mask technique overcomes cumbersome practice alignment two masks, which limits achievable lateral size. The holes obtained are conical, have so-called rim, small insulating clearance...