Publications (45)
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…
Investigation of the collisionless plasmoid instability based on gyrofluid and gyrokinetic integrated approach
C. Granier, R. Numata, D. Borgogno +2
In this work, the development of two-dimensional current sheets with respect to tearing-modes, in collisionless plasmas with a strong guide field, is analysed. During their non-lin…
Radiation tolerance tests on key components of the ePIC-dRICH readout card
S. Geminiani, B. R. Achari, N. Agrawal +60
The dual-radiator RICH (dRICH) detector of the ePIC experiment will employ over 300000 SiPM pixels as photosensors, organized into more than 1000 Photon Detection Units. Each PDU i…
Influence of ion-to-electron temperature ratio on tearing instability and resulting subion-scale turbulence in a low- collisionless plasma
C. Granier, E. Tassi, D. Laveder +2
A two-field gyrofluid model including ion finite Larmor radius (FLR) corrections, magnetic fluctuations along the ambient field and electron inertia is used to study two-dimensiona…
Exact solutions for reconnective annihilation in magnetic configurations with three sources
E. Tassi, V. S. Titov, G. Hornig
Exact solutions of the steady resistive three dimensional (3D) magnetohydrodynamics (MHD) equations in cylindrical coordinates for an incompressible plasma are presented. The solut…
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…
ATHENA Detector Proposal -- A Totally Hermetic Electron Nucleus Apparatus proposed for IP6 at the Electron-Ion Collider
ATHENA Collaboration, J. Adam, L. Adamczyk +433
ATHENA has been designed as a general purpose detector capable of delivering the full scientific scope of the Electron-Ion Collider. Careful technology choices provide fine trackin…
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…
The design and performance of the ZEUS Micro Vertex detector
A. Polini, I. Brock, S. Goers +79
In order to extend the tracking acceptance, to improve the primary and secondary vertex reconstruction and thus enhancing the tagging capabilities for short lived particles, the ZE…
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…
Linear stability of magnetic vortex chains in a plasma in the presence of equilibrium electron temperature anisotropy
C. Granier, E. Tassi
The linear stability of chains of magnetic vortices in a plasma is investigated analytically in two dimensions by means of a reduced fluid model assuming a strong guide field and a…
Exact solutions for magnetic annihilation in curvilinear geometry
E. Tassi, V. S. Titov, G. Hornig
New exact solutions of the steady and incompressible 2D MHD equations in polar coordinates are presented. The solutions describe the process of reconnective magnetic annihilation i…
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…
Hamiltonian fluid closures of the Vlasov-Amp{è}re equations: from water-bags to N moment models
M. Perin, Cristel Chandre, P. J. Morrison +1
Moment closures of the Vlasov-Amp{è}re system, whereby higher moments are represented as functions of lower moments with the constraint that the resulting fluid system remains Ham…
Inertial magnetohydrodynamics
M. Lingam, P. J. Morrison, E. Tassi
A version of extended magnetohydrodynamics (MHD) that incorporates electron inertia is obtained by constructing an action principle. Unlike MHD which freezes in magnetic flux, the…
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…
New classes of exact solutions for magnetic reconnective annihilation
E. Tassi, V. S. Titov, G. Hornig
Analytical solutions for reconnective annihilation in curvilinear geometry are presented. These solutions are characterized by current density distributions varying both along the…
On the Relation of the LHeC and the LHC
J. L. Abelleira Fernandez, C. Adolphsen, P. Adzic +206
The present note relies on the recently published conceptual design report of the LHeC and extends the first contribution to the European strategy debate in emphasising the role of…
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…
Gyrofluid simulations of turbulence and reconnection in space plasmas
T. Passot, S. S. Cerri, C. Granier +3
A Hamiltonian two-field gyrofluid model is used to investigate the dynamics of an electron-ion collisionless plasma subject to a strong ambient magnetic field, within a spectral ra…
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…
A Hamiltonian gyrofluid model based on a quasi-static closure
E. Tassi, T. Passot, P. L. Sulem
A Hamiltonian six-field gyrofluid model is constructed, based on closure relations derived from the so-called "quasi-static" gyrokinetic linear theory where the fields are assumed…
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…
Imposing quasineutrality on electrostatic plasmas via the Dirac theory of constraints
D. A. Kaltsas, J. W. Burby, P. J. Morrison +2
We present a method for imposing quasineutrality and, more generally, charge density conservation in the Vlasov-Poisson (VP) and Vlasov-Ampère (VA) systems, which describe electro…
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…
Hamiltonian formulation and analysis of a collisionless fluid reconnection model
E. Tassi, P. J. Morrison, F. L. Waelbroeck +1
The Hamiltonian formulation of a plasma four-field fluid model that describes collisionless reconnection is presented. The formulation is noncanonical with a corresponding Lie-Pois…
Electron-scale reduced fluid models with gyroviscous effects
T. Passot, P. L. Sulem, E. Tassi
Reduced fluid models for collisionless plasmas including electron inertia and finite Larmor radius corrections are derived for scales ranging from the ion to the electron gyroradii…
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…
A Large Hadron Electron Collider at CERN: Report on the Physics and Design Concepts for Machine and Detector
J. L. Abelleira Fernandez, C. Adolphsen, A. N. Akay +190
The physics programme and the design are described of a new collider for particle and nuclear physics, the Large Hadron Electron Collider (LHeC), in which a newly built electron be…
ePIC Early Science Report
D. Abbott, N. Abdelrahman, S. Abhijit +781
This Early Science Report from the ePIC Collaboration outlines the compelling physics program achievable during the first years of operation of the Electron-Ion Collider (EIC), pri…
Hamiltonian formulation of the quasineutral Vlasov-Poisson system
J. W. Burby, D. A. Kaltsas, P. J. Morrison +2
Slow manifold reduction and the theory of Poisson-Dirac submanifolds are used to deduce a Hamiltonian formulation for a quasineutral limit of the planar, collisionless, magnetized…
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…
Structure and computation of two-dimensional incompressible extended MHD
D. Grasso, E. Tassi, H. M. Abdelhamid +1
A comprehensive study of a reduced version of Lust's equations, the extended magnetohydrodynamic (XMHD) model obtained from the two-fluid theory for electrons and ions with the enf…
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…
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…
A Large Hadron Electron Collider at CERN
J. L. Abelleira Fernandez, C. Adolphsen, P. Adzic +206
This document provides a brief overview of the recently published report on the design of the Large Hadron Electron Collider (LHeC), which comprises its physics programme, accelera…