Publications (48)
Measurement of the cross-section ratio in exclusive photoproduction at HERA
ZEUS Collaboration, I. Abt, M. Adamus +80
The exclusive photoproduction reactions and have been measured at an centre-of-mass energy of 318 GeV with the ZEUS detector at HERA us…
The MONOLITH project
A. Geiser
MONOLITH is a proposed massive (34 kt) magnetized tracking calorimeter at the Gran Sasso laboratory in Italy, optimized for the detection of atmospheric muon neutrinos. The main go…
Charm production in charged current deep inelastic scattering at HERA
ZEUS collaboration, I. Abt, L. Adamczyk +92
Charm production in charged current deep inelastic scattering has been measured for the first time in collisions, using data collected with the ZEUS detector at HERA, co…
Search for a narrow baryonic state decaying to and in deep inelastic scattering at HERA
ZEUS Collaboration, H. Abramowicz, I. Abt +124
A search for a narrow baryonic state in the and system has been performed in collisions at HERA with the ZEUS detector using an integrated luminosity o…
Exclusive electroproduction of two pions at HERA
ZEUS collaboration, H. Abramowicz, I. Abt +302
The exclusive electroproduction of two pions in the mass range 0.4 < MÏÏ < 2.5 GeV has been studied with the ZEUS detector at HERA using an integrated luminosity of 82 pb-1. The…
Measurement of beauty production in deep inelastic scattering at HERA using decays into electrons
ZEUS collaboration, H. Abramowicz, I. Abt +311
The production of beauty quarks in ep interactions has been studied with the ZEUS detector at HERA for exchanged four-momentum squared Q^2 > 10 GeV^2, using an integrated luminosit…
Search for effective Lorentz and CPT violation using ZEUS data
ZEUS collaboration, I. Abt, R. Aggarwal +77
Lorentz and CPT symmetry in the quark sector of the Standard Model are studied in the context of an effective field theory using ZEUS data. Symmetry-violating effects c…
Further studies of the photoproduction of isolated photons with a jet at HERA
ZEUS Collaboration, H. Abramowicz, I. Abt +170
In this extended analysis using the ZEUS detector at HERA, the photoproduction of isolated photons together with a jet is measured for different ranges of the fractional photon ene…
Measurement of the t dependence in exclusive photoproduction of Upsilon(1S) mesons at HERA
ZEUS collaboration, H. Abramowicz, I. Abt +300
The exclusive photoproduction reaction gamma p -> Upsilon(1S) p has been studied with the ZEUS detector in ep collisions at HERA using an integrated luminosity of 468 pb^-1. The me…
Summary of the NOW'98 Phenomenology Working Group
S. M. Bilenky, A. Geiser, C. Giunti +4
Summary of the Phenomenology Working Group at the Europhysics Neutrino Oscillation Workshop (NOW'98), 7-9 September 1998, Amsterdam.
Further studies of isolated photon production with a jet in deep inelastic scattering at HERA
ZEUS Collaboration, H. Abramowicz, I. Abt +111
Isolated photons with high transverse energy have been studied in deep inelastic scattering with the ZEUS detector at HERA, using an integrated luminosity of pb…
Combined QCD and electroweak analysis of HERA data
ZEUS Collaboration, H. Abramowicz, I. Abt +124
A simultaneous fit of parton distribution functions (PDFs) and electroweak parameters to HERA data on deep inelastic scattering is presented. The input data are the neutral current…
Heavy Quarks: Summary Report
J. Baines, S. P. Baranov, O. Behnke +38
The present status of the heavy-quark production theory is critically reviewed in the first contribution. The second contribution summarises the present heavy flavour data from HER…
Measurement of high-Q2 neutral current deep inelastic e+p scattering cross sections with a longitudinally polarised positron beam at HERA
ZEUS Collaboration, H. Abramowicz, I. Abt +300
Measurements of neutral current cross sections for deep inelastic scattering in e+p collisions at HERA with a longitudinally polarised positron beam are presented. The single-diffe…
Impact of the heavy quark matching scales in PDF fits
The xFitter Developers Team, V. Bertone, D. Britzger +14
We investigate the impact of displaced heavy quark matching scales in a global fit. The heavy quark matching scale determines at which energy scale the QCD theory tra…
Prompt neutrino fluxes in the atmosphere with PROSA parton distribution functions
PROSA Collaboration, M. V. Garzelli, S. Moch +6
Effects on atmospheric prompt neutrino fluxes of present uncertainties affecting the nucleon composition are studied by using the PROSA fit to parton distribution functions (PDFs).…
Measurement of jet production in deep inelastic scattering and NNLO determination of the strong coupling at ZEUS
ZEUS Collaboration, I. Abt, R. Aggarwal +78
A new measurement of inclusive-jet cross sections in the Breit frame in neutral current deep inelastic scattering using the ZEUS detector at the HERA collider is presented. The dat…
The FMNRxPYTHIA interface for Heavy Quark production at HERA
A. Geiser, A. E. Nuncio Quiroz
A method to calculate heavy flavor visible-level cross sections at Next-to-Leading Order (NLO) in Quantum Chromodynamics (QCD), based on an interface of the FMNR program to PYTHIA,…
Observation of the rare decay from the combined analysis of CMS and LHCb data
The CMS, LHCb Collaborations, : +2807
A joint measurement is presented of the branching fractions and in proton-proton collisions at the LHC by the CMS and LHCb experiments. The data…
HERA and the LHC - A workshop on the implications of HERA for LHC physics: Proceedings - Part A
S. Alekhin, G. Altarelli, N. Amapane +191
The HERA electron--proton collider has collected 100 pb of data since its start-up in 1992, and recently moved into a high-luminosity operation mode, with upgraded detectors…
Impact of jet-production data on the next-to-next-to-leading-order determination of HERAPDF2.0 parton distributions
H1, ZEUS Collaborations, : +234
The HERAPDF2.0 ensemble of parton distribution functions (PDFs) was introduced in 2015. The final stage is presented, a next-to-next-to-leading-order (NNLO) analysis of the HERA da…
Charm, Beauty and Top at HERA
O. Behnke, A. Geiser, M. Lisovyi
Results on open charm and beauty production and on the search for top production in high-energy electron-proton collisions at HERA are reviewed. This includes a discussion of relev…
Measurement of beauty and charm production in deep inelastic scattering at HERA and measurement of the beauty-quark mass
ZEUS collaboration, H. Abramowicz, I. Abt +171
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 integ…
Measurement of neutral current e+/-p cross sections at high Bjorken x with the ZEUS detector
ZEUS Collaboration, H. Abramowicz, I. Abt +170
The neutral current e+/-p cross section has been measured up to values of Bjorken x of approximately 1 with the ZEUS detector at HERA using an integrated luminosity of 187 inv. pb…
HERA and the LHC - A workshop on the implications of HERA for LHC physics: Proceedings - Part B
S. Alekhin, G. Altarelli, N. Amapane +191
The HERA electron--proton collider has collected 100 pb of data since its start-up in 1992, and recently moved into a high-luminosity operation mode, with upgraded detectors…
Data Preservation in High Energy Physics
T. Basaglia, M. Bellis, J. Blomer +51
Data preservation is a mandatory specification for any present and future experimental facility and it is a cost-effective way of doing fundamental research by exploiting unique da…
Measurement of the cross-section ratio sigma_{psi(2S)}/sigma_{J/psi(1S)} in deep inelastic exclusive ep scattering at HERA
ZEUS Collaboration, H. Abramowicz, I. Abt +144
The exclusive deep inelastic electroproduction of and at an centre-of-mass energy of 317 GeV has been studied with the ZEUS detector at HERA in the kinemat…
Measurement of D* photoproduction at three different centre-of-mass energies at HERA
ZEUS Collaboration, H. Abramowicz, I. Abt +170
The photoproduction of mesons has been measured with the ZEUS detector at HERA at three different ep centre-of-mass energies, , of 318, 251 and 225 GeV. For ea…
Deep inelastic cross-section measurements at large y with the ZEUS detector at HERA
ZEUS Collaboration, H. Abramowicz, I. Abt +170
The reduced cross sections for deep inelastic scattering have been measured with the ZEUS detector at HERA at three different centre-of-mass energies, , and $22…
Charm total cross sections with nonuniversal fragmentation treatment
A. Geiser, Y. Yang, S. Moch +1
Total charm-pair cross sections in collisions are interesting because they can be calculated to NNLO in QCD without any reference to fragmentation effects. On the other hand,…
Inclusive-jet photoproduction at HERA and determination of alphas
ZEUS Collaboration, H. Abramowicz, I. Abt +303
Inclusive-jet cross sections have been measured in the reaction ep->e+jet+X for photon virtuality Q2 < 1 GeV2 and gamma-p centre-of-mass energies in the region 142 < W(gamma-p) < 2…
Proceedings of the workshop: HERA and the LHC workshop series on the implications of HERA for LHC physics
H. Jung, A. De Roeck, Z. J. Ajaltouni +265
2nd workshop on the implications of HERA for LHC physics. Working groups: Parton Density Functions Multi-jet final states and energy flows Heavy quarks (charm and beauty) Diffracti…
The azimuthal correlation between the leading jet and the scattered lepton in deep inelastic scattering at HERA
ZEUS Collaboration, I. Abt, R. Aggarwal +78
The azimuthal correlation angle, , between the scattered lepton and the leading jet in deep inelastic scattering at HERA has been studied using data collected with…
Future Atmospheric Neutrino Detectors
A. Geiser
Future experiments focusing on atmospheric neutrino detection are reviewed. One of the main goals of these experiments is the detection of an unambiguous oscillation pattern (nu_mu…
Production of Z0 bosons in elastic and quasi-elastic ep collisions at HERA
ZEUS collaboration, H. Abramowicz, I. Abt +300
The production of Z0 bosons in the reaction ep -> eZ0p*, where p* stands for a proton or a low-mass nucleon resonance, has been studied in ep collisions at HERA using the ZEUS dete…
Improved constraints on parton distributions using LHCb, ALICE and HERA heavy-flavour measurements and implications for the predictions for prompt atmospheric-neutrino fluxes
O. Zenaiev, M. V. Garzelli, K. Lipka +5
The impact of measurements of heavy-flavour production in deep inelastic scattering and in collisions on parton distribution functions is studied in a QCD analysis at nex…
Azimuthal correlations in photoproduction and deep inelastic scattering at HERA
ZEUS collaboration, I. Abt, R. Aggarwal +81
Collective behaviour of final-state hadrons, and multiparton interactions are studied in high-multiplicity scattering at a centre-of-mass energy GeV with the ZE…
Measurement of heavy-quark jet photoproduction at HERA
ZEUS Collaboration, H. Abramowicz, I. Abt +309
Photoproduction of beauty and charm quarks in events with at least two jets has been measured with the ZEUS detector at HERA using an integrated luminosity of 133 . The fr…
Measurement of the cross-section ratio sigma_{psi(2S)}/sigma_{J/psi(1S)} in deep inelastic exclusive ep scattering at HERA
ZEUS Collaboration, H. Abramowicz, I. Abt +144
The exclusive deep inelastic electroproduction of and at an centre-of-mass energy of 317 GeV has been studied with the ZEUS detector at HERA in the kinemat…
Scaled momentum distributions for K0s and Lambda/bar Lambda in DIS at HERA
ZEUS Collaboration, H. Abramowicz, I. Abt +300
Scaled momentum distributions for the strange hadrons K0s and Lambda/bar Lambda were measured in deep inelastic ep scattering with the ZEUS detector at HERA using an integrated lum…
Production of exclusive dijets in diffractive deep inelastic scattering at HERA
ZEUS Collaboration, H. Abramowicz, I. Abt +144
Production of exclusive dijets in diffractive deep inelastic scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 372 pb.…
Measurement of beauty production in DIS and F_2^bbbar extraction at ZEUS
ZEUS collaboration, H. Abramowicz, I. Abt +311
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 integ…
Running of the Charm-Quark Mass from HERA Deep-Inelastic Scattering Data
A. Gizhko, A. Geiser, S. Moch +47
Combined HERA data on charm production in deep-inelastic scattering have previously been used to determine the charm-quark running mass in the MSbar renormalisation sche…
xFitter 2.0.0: Heavy quark matching scales: Unifying the FFNS and VFNS
The xFitter Developers' Team, :, V. Bertone +15
xFitter is an open-source package that provides a framework for the determination of the parton distribution functions (PDFs) of the proton for many different kinds of analyses in…
Summary of workshop on Future Physics with HERA Data
A. Bacchetta, J. Blümlein, O. Behnke +30
Recent highlights from the HERA experiments, Hermes, H1 and ZEUS, are reviewed and ideas for future analyses to fully exploit this unique data set are proposed. This document is a…
Search for single-top production in ep collisions at HERA
ZEUS Collaboration, H. Abramowicz, I. Abt +300
A search for single-top production, , has been performed with the ZEUS detector at HERA using data corresponding to an integrated luminosity of $0.37\fbi$. No e…
Limits on the effective quark radius from inclusive scattering at HERA
ZEUS Collaboration, H. Abramowicz, I. Abt +125
The high-precision HERA data allows searches up to TeV scales for Beyond the Standard Model contributions to electron-quark scattering. Combined measurements of the inclusive deep…
Pseudo-Dirac neutrinos as a potential complete solution to the neutrino oscillation puzzle
A. Geiser
A solution for the neutrino mass and mixing pattern is proposed which is compatible with all available experimental data on neutrino oscillations. This solution involves Majorana n…