Dr. Andrea George
Profil
Forschungsthemen4
Doctoral Scholarships from Jameel Education Foundation 17th Cohort
Quelle ↗Förderer: Andere internationale Stiftungen Zeitraum: 03/2023 - 12/2027 Projektleitung: Dr. Andrea George, Jeannette Latino, apl. Prof. Dr. Sabine Hunke
Doctoral Scholarships from Jameel Education Foundation 18th Cohort
Quelle ↗Förderer: Andere internationale Stiftungen Zeitraum: 03/2024 - 05/2028 Projektleitung: Dr. Andrea George, apl. Prof. Dr. Sabine Hunke, Jeannette Latino
Jameel 16. Kohorte - Pauschalmittel
Quelle ↗Förderer: Andere internationale Stiftungen Zeitraum: 11/2021 - 05/2028 Projektleitung: Dr. Andrea George
Jameel Education Foundation - Humboldt-Universität zu Berlin - Scholarship Agreement 16th Cohort
Quelle ↗Förderer: Andere internationale Stiftungen Zeitraum: 11/2021 - 10/2026 Projektleitung: Dr. Andrea George
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Publikationen25
Top 25 nach Zitationen — Quelle: OpenAlex (BAAI/bge-m3 embedded für Matching).
Journal of High Energy Physics · 717 Zitationen · DOI
A combination is presented of the inclusive deep inelastic cross sections measured by the H1 and ZEUS Collaborations in neutral and charged current unpolarised e p scattering at HERA during the period 1994-2000. The data span six orders of magnitude in negative four-momentum-transfer squared, Q 2 , and in Bjorken x. The combination method used takes the correlations of systematic uncertainties into account, resulting in an improved accuracy. The combined data are the sole input in a NLO QCD analysis which determines a new set of parton distributions, HERAPDF1.0, with small experimental uncertainties. This set includes an estimate of the model and parametrisation uncertainties of the fit result.
The European Physical Journal C · 660 Zitationen · DOI
A combination is presented of all inclusive deep \ninelastic cross sections previously published by the H1 and \nZEUS collaborations at HERA for neutral and charged current e± p scattering for zero beam polarisation. The datawere \ntaken at proton beam energies of 920, 820, 575 and 460GeV \nand an electron beam energy of 27.5GeV. The data correspond \nto an integrated luminosity of about 1 fb−1 and span \nsix orders ofmagnitude in negative four-momentum-transfer \nsquared, Q2, and Bjorken x. The correlations of the systematic \nuncertainties were evaluated and taken into account for \nthe combination. The combined cross sections were input \nto QCD analyses at leading order, next-to-leading order and \nat next-to-next-to-leading order, providing a new set of parton \ndistribution functions, called HERAPDF2.0. In addition \nto the experimental uncertainties, model and parameterisation \nuncertainties were assessed for these parton distribution \nfunctions. Variants of HERAPDF2.0 with an alternative \ngluon parameterisation, HERAPDF2.0AG, and using fixedflavour- \nnumber schemes, HERAPDF2.0FF, are presented. \nThe analysiswas extended by includingHERAdata on charm \nand jet production, resulting in the variant HERAPDF2.0Jets. \nThe inclusion of jet-production cross sections made a simultaneous \ndetermination of these parton distributions and the \nstrong coupling constant possible, resulting in αs (M2Z \n) = \n0.1183±0.0009(exp)±0.0005(model/parameterisation)± \n0.0012(hadronisation) \n+0.0037 \n−0.0030(scale).An extraction of xFγ Z \n3 \nand results on electroweak unification and scaling violations \nare also presented.
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · 276 Zitationen · DOI
The European Physical Journal C · 192 Zitationen · DOI
Measurements of open charm production cross sections in deep-inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections σcc¯red for charm production are obtained in the kinematic range of photon virtuality 2.5≤Q 2≤2000 GeV2 and Bjorken scaling variable 3⋅10−5≤x≤5⋅10−2. The combination method accounts for the correlations of the systematic uncertainties among the different data sets. The combined charm data together with the combined inclusive deep-inelastic scattering cross sections from HERA are used as input for a detailed NLO QCD analysis to study the influence of different heavy flavour schemes on the parton distribution functions. The optimal values of the charm mass as a parameter in these different schemes are obtained. The implications on the NLO predictions for W ± and Z production cross sections at the LHC are investigated. Using the fixed flavour number scheme, the running mass of the charm quark is determined.
Physics Letters B · 69 Zitationen · DOI
A search for single-top production, ep→etX, has been performed with the ZEUS detector at HERA using data corresponding to an integrated luminosity of 0.37 fb−1. No evidence for top production was found, consistent with the expectation from the Standard Model. Limits were computed for single-top production via flavour changing neutral current transitions involving a neutral electroweak vector boson, γ or Z. The result was combined with a previous ZEUS result yielding a total luminosity of 0.50 fb−1. A 95% credibility level upper limit of 0.13 pb was obtained for the cross section at the centre-of-mass energy of s=315 GeV.
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · 68 Zitationen · DOI
Physics Letters B · 66 Zitationen · DOI
Journal of High Energy Physics · 56 Zitationen · DOI
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 GeV 2 using an integrated luminosity of 354 pb -1 . The beauty and charm content in events with at least one jet have been extracted using the invariant mass of charged tracks associated with secondary vertices and the decay-length significance of these vertices. Differential cross sections as a function of Q 2 , Bjorken x, jet transverse energy and pseudorapidity were measured and compared with next-to-leading-order QCD calculations. The beauty and charm contributions to the proton structure functions were extracted from the double-differential cross section as a function of x and Q 2 . The running beauty-quark mass, m b at the scale m b , was determined from a QCD fit at next-to-leading order to HERA data for the first time and found to be m b (m b ) = 4.07 0.14 (fit) +0.01 -0.07 (mod.) +0.05 -0.00 (param.) +0.08 -0.05 (theo.) GeV.
Nuclear Physics B · 54 Zitationen · DOI
Journal of High Energy Physics · 52 Zitationen · DOI
A bstract The production of D 0 , D * + , D + , $ D_s^{+} $ and $ \Lambda_c^{+} $ charm hadrons and their antiparticles in ep scattering at HERA has been studied with the ZEUS detector, using a total integrated luminosity of 372 pb −1 . The fractions of charm quarks hadronising into a particular charm hadron were derived. In addition, the ratio of neutral to charged D -meson production rates, the fraction of charged D mesons produced in a vector state, and the stangeness-suppression factor have been determined. The measurements have been performed in the photoproduction regime. The charm hadrons were reconstructed in the range of transverse momentum p T > 3 . 8 GeV and pseudorapidity | η | < 1 . 6. The charm fragmentation fractions are compared to previous results from HERA and from e + e − experiments. The data support the hypothesis that fragmentation is independent of the production process.
The European Physical Journal C · 47 Zitationen · DOI
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology · 46 Zitationen · DOI
The reduced cross sections for ${e}^{+}p$ deep inelastic scattering have been measured with the ZEUS detector at HERA at three different center-of-mass energies, 318, 251 and 225 GeV. The cross sections, measured double differentially in Bjorken $x$ and the virtuality, ${Q}^{2}$, were obtained in the region $0.13\ensuremath{\le}y\ensuremath{\le}0.75$, where $y$ denotes the inelasticity and $5\ensuremath{\le}{Q}^{2}\ensuremath{\le}110\text{ }\text{ }{\mathrm{GeV}}^{2}$. The proton structure functions ${F}_{2}$ and ${F}_{L}$ were extracted from the measured cross sections.
The European Physical Journal C · 45 Zitationen · DOI
The European Physical Journal C · 44 Zitationen · DOI
Measurements of the cross sections for charged current deep inelastic scattering in e + p collisions with a longitudinally polarised positron beam are presented. The measurements are based on a data sample with an integrated luminosity of 132 pb -1 collected with the ZEUS detector at HERA at a centre-of-mass energy of 318 GeV. The total cross section is presented at positive and negative values of the longitudinal polarisation of the positron beams. The single-differential cross-sections d/dQ 2 , d/dx and
The European Physical Journal C · 42 Zitationen · DOI
Journal of High Energy Physics · 40 Zitationen · DOI
A search for events containing an isolated electron or muon and missing transverse momentum produced in e p collisions is performed with the H1 and ZEUS detectors at HERA. The data were taken in the period 1994-2007 and correspond to an integrated luminosity of 0.98 fb -1 . The observed event yields are in good overall agreement with the Standard Model prediction, which is dominated by single W production. In the e + p data, at large hadronic transverse momentum P X T > 25 GeV, a total of 23 events are observed compared to a prediction of 14.0 1.9. The total single W boson production cross section is measured as 1.06 0.16 (stat.) 0.07 (sys.) pb, in agreement with an Standard Model (SM) expectation of 1.26 0.19 pb.
Physics Letters B · 39 Zitationen · DOI
For the first time, differential inclusive-jet cross sections have been measured in neutral current deep inelastic ep scattering using the anti-kT and SIScone algorithms. The measurements were made for boson virtualities Q2>125 GeV2 with the ZEUS detector at HERA using an integrated luminosity of 82 pb−1 and the jets were identified in the Breit frame. The performance and suitability of the jet algorithms for their use in hadron-like reactions were investigated by comparing the measurements to those performed with the kT algorithm. Next-to-leading-order QCD calculations give a good description of the measurements. Measurements of the ratios of cross sections using different jet algorithms are also presented; the measured ratios are well described by calculations including up to O(αs3) terms. Values of αs(MZ) were extracted from the data; the results are compatible with and have similar precision to the value extracted from the kT analysis.
Physics Letters B · 38 Zitationen · DOI
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology · 34 Zitationen · DOI
A search for first-generation leptoquarks was performed in electron-proton and positron-proton collisions recorded with the ZEUS detector at HERA in 2003--2007 using an integrated luminosity of $366\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$. Final states with an electron and jets or with missing transverse momentum and jets were analyzed, searching for resonances or other deviations from the standard model predictions. No evidence for any leptoquark signal was found. The data were combined with data previously taken at HERA, resulting in a total integrated luminosity of $498\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$. Limits on the Yukawa coupling, $\ensuremath{\lambda}$, of leptoquarks were set as a function of the leptoquark mass for different leptoquark types within the Buchm\"uller-R\"uckl-Wyler model. Leptoquarks with a coupling $\ensuremath{\lambda}=0.3$ are excluded for masses up to 699 GeV.
The European Physical Journal C · 34 Zitationen · DOI
Single- and double-differential inclusive dijet cross sections in neutral current deep inelastic ep scattering have been measured with the ZEUS detector using an integrated luminosity of 374 pb−1. The measurement was performed at large values of the photon virtuality, Q 2, between 125 and 20 000 GeV2. The jets were reconstructed with the k T cluster algorithm in the Breit reference frame and selected by requiring their transverse energies in the Breit frame, $E^{\rm jet}_{T,{\rm B}}$ , to be larger than 8 GeV. In addition, the invariant mass of the dijet system, $M_{\rm jj}$ , was required to be greater than 20 GeV. The cross sections are described by the predictions of next-to-leading-order QCD.
Physics Letters B · 31 Zitationen · DOI
Journal of High Energy Physics · 28 Zitationen · DOI
We extend the Standard Model with an EW fermion triplet, stable thanks to one of the accidental symmetries already present in the theory. On top of being a potential Dark Matter candidate, additional motivations for this new state are the stability of the vacuum, the fact it does not introduce a large fine-tuning in the Higgs mass, and that it helps with gauge coupling unification. We perform an analysis of the reach for such a particle at the high-luminosity Lhc, and at a futuristic 100 TeV pp collider. We do so for the monojet, monophoton, vector boson fusion and disappearing tracks channels. At 100 TeV, disappearing tracks will likely probe the mass region of 3 TeV, relevant for thermally produced Dark Matter. The reach of the other channels is found to extend up to 1.3 (1.7) TeV for 3 (30) ab -1 of integrated luminosity, provided systematics are well under control. This model also constitutes a benchmark of a typical WIMP Dark Matter candidate, and its phenomenology reproduces that of various models of Supersymmetry featuring a pure Wino as the lightest sparticle.
Physics Letters B · 27 Zitationen · DOI
The European Physical Journal C · 26 Zitationen · DOI
Beauty production in deep inelastic scattering with events in which a muon and a jet are observed in the final state has been measured with the ZEUS detector at HERA using an integrated luminosity of 114 pb<sup>-1</sup>. The fraction of events with beauty quarks in the data was determined using the distribution of the transverse momentum of the muon relative to the jet. The cross section for beauty production was measured in the kinematic range of photon virtuality, Q<sup>2</sup>>2 GeV<sup>2</sup>, and inelasticity, 0.05&lt;y&lt;0.7, with the requirement of a muon and a jet. Total and differential cross sections are presented and compared to QCD predictions. The beauty contribution to the structure function F<inf>2</inf> was extracted and is compared to theoretical predictions. © 2010 The Author(s).
The European Physical Journal C · 25 Zitationen · DOI
Kooperationen0
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Stammdaten
Identität, Organisation und Kontakt aus HU-FIS.
- Name
- Dr. Andrea George
- Titel
- Dr.
- Fakultät
- Vizepräsident(in) für Forschung
- Institut
- Humboldt Graduate School
- Telefon
- +49 30 2093-89706
- HU-FIS-Profil
- Quelle ↗
- Zuletzt gescrapt
- 26.4.2026, 01:05:05