Publications (58)
Inclusive dielectron production in proton-proton collisions at 2.2 GeV beam energy
G. Agakishiev, H. Alvarez-Pol, A. Balanda +92
Data on inclusive dielectron production are presented for the reaction p+p at 2.2 GeV measured with the High Acceptance DiElectron Spectrometer (HADES). Our results supplement data…
Inclusive dielectron spectra in p+p collisions at 3.5 GeV
G. Agakishiev, A. Balanda, D. Belver +98
We present the inclusive invariant-mass, transverse momentum and rapidity distributions of dielectrons (ee pairs) in p+p interactions at 3.5 GeV beam kinetic energy. In…
Partial Wave Analysis of the Reaction to Search for the "" Bound State
G. Agakishiev, O. Arnold, D. Belver +93
Employing the Bonn-Gatchina partial wave analysis framework (PWA), we have analyzed HADES data of the reaction . This reaction might contain information ab…
First measurement of low momentum dielectrons radiated off cold nuclear matter
G. Agakishiev, A. Balanda, D. Belver +95
We present data on dielectron emission in proton induced reactions on a Nb target at 3.5 GeV kinetic beam energy measured with HADES installed at GSI. The data represent the first…
Technical Supplement to "Polarization Transfer Observables in Elastic Electron-Proton Scattering at Q = 2.5, 5.2, 6.8, and 8.5 GeV"
A. J. R. Puckett, E. J. Brash, M. K. Jones +103
The GEp-III and GEp-2 experiments, carried out in Jefferson Lab's Hall C from 2007-2008, consisted of measurements of polarization transfer in elastic electron-proton scatterin…
Inclusive Dielectron Production in Ar+KCl Collisions at 1.76 AGeV studied with HADES
The HADES Collaboration, F. Krizek, G. Agakishiev +110
Results of the HADES measurement of inclusive dielectron production in Ar+KCl collisions at a kinetic beam energy of 1.76 AGeV are presented. For the first time, high mass resoluti…
Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio to Q^2 = 8.5 GeV^2
A. J. R. Puckett, E. J. Brash, M. K. Jones +103
Among the most fundamental observables of nucleon structure, electromagnetic form factors are a crucial benchmark for modern calculations describing the strong interaction dynamics…
Inclusive pion and eta production in p+Nb collisions at 3.5 GeV beam energy
G. Agakishiev, A. Balanda, D. Belver +94
Data on inclusive pion and eta production measured with the dielectron spectrometer HADES in the reaction p+93Nb at a kinetic beam energy of 3.5 GeV are presented. Our results, obt…
Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV
G. Agakishiev, A. Balanda, D. Belver +94
We report on baryon resonance production and decay in proton-proton collisions at a kinetic energy of GeV based on data measured with HADES. The exclusive channels $pp \right…
Measurement of charged pions in 12C + 12C collisions at 1A GeV and 2A GeV with HADES
The HADES Collaboration, G. Agakishiev, C. Agodi +123
We present the results of a study of charged pion production in 12C + 12C collisions at incident beam energies of 1A GeV and 2A GeV using the HADES spectrometer at GSI. The main em…
Search for effects beyond the Born approximation in polarization transfer observables in elastic scattering
M. Meziane, E. J. Brash, R. Gilman +108
Intensive theoretical and experimental efforts over the past decade have aimed at explaining the discrepancy between data for the proton electric to magnetic form factor ratio, $G_…
Lambda hyperon production and polarization in collisions of p(3.5 GeV) + Nb
G. Agakishiev, O. Arnold, A. Balanda +95
Results on hyperon production are reported for collisions of p(3.5 GeV) + Nb, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI Helmholtzzentru…
In-Medium Effects on K0 Mesons in Relativistic Heavy-Ion Collisions
G. Agakishiev, A. Balanda, B. Bannier +108
We present the transverse momentum spectra and rapidity distributions of and K in Ar+KCl reactions at a beam kinetic energy of 1.756 A GeV measured with the spectrom…
Searching a Dark Photon with HADES
HADES Collaboration, G. Agakishiev, A. Balanda +98
We present a search for the e+e- decay of a hypothetical dark photon, also names U vector boson, in inclusive dielectron spectra measured by HADES in the p (3.5 GeV) + p, Nb reacti…
Study of the quasi-free reaction with a deuterium beam at 1.25 GeV/nucleon
G. Agakishiev, A. Balanda, D. Belver +102
The tagged quasi-free reaction has been studied experimentally with the High Acceptance Di-Electron Spectrometer (HADES) at GSI at a deuteron incident beam ener…
Determination of the ratio in p+p collisions at 3.5 GeV
G. Agakishiev, A. Balanda, D. Belver +98
The aim of the present analysis is to determine the relative production cross sections of the (1405) and resonances in p+p collisions at E=3.5 GeV measur…
Medium effects in proton-induced production at 3.5 GeV
G. Agakishiev, O. Arnold, D. Belver +94
We present the analysis of the inclusive production in p+p and p+Nb collisions measured with the HADES detector at a beam kinetic energy of 3.5 GeV. Data are compared to th…
Baryonic resonances close to the Kbar-N threshold: the case of Sigma(1385)^+ in pp collisions
G. Agakishiev, A. Balanda, D. Belver +99
We present results of an exclusive measurement of the first excited state of the Sigma hyperon, Sigma(1385)^+, produced in p+p -> Sigma^+ + K^+ + n at 3.5 GeV beam energy. The extr…
Phi decay: a relevant source for K- production at SIS energies?
The HADES Collaboration, G. Agakishiev, A. Balanda +110
We present phase space distributions and multiplicities of K+, K- and phi mesons produced in Ar+KCl reactions at a kinetic beam energy of 1.756 AGeV and measured with the HADES spe…
Future perspectives at SIS-100 with HADES-at-FAIR
The HADES Collaboration, I. Froehlich, G. Agakishiev +110
Currently, the HADES spectrometer undergoes un upgrade program to be prepared for measurements at the upcoming SIS-100 synchrotron at FAIR. We describe the current status of the HA…
Origin of the low-mass electron pair excess in light nucleus-nucleus collisions
The HADES Collaboration, G. Agakishiev, A. Balanda +97
We report measurements of electron pair production in elementary p+p and d+p reactions at 1.25 GeV/u with the HADES spectrometer. For the first time, the electron pairs were recons…
Identical pion intensity interferometry at sqrt(s_{NN})=2.4 GeV
J. Adamczewski-Musch, O. Arnold, C. Behnke +116
High-statistics and femtoscopy data are presented for Au+Au collisions at GeV, measured with HADES at SIS18/GSI. The experimental c…
Statistical model analysis of hadron yields in proton-nucleus and heavy-ion collisions at SIS 18 energies
G. Agakishiev, O. Arnold, A. Balanda +107
The HADES data from p+Nb collisions at center of mass energy of = 3.2 GeV are analyzed by employing a statistical model. Accounting for the identified hadrons …
Identical pion intensity interferometry in central Au+Au collisions at 1.23A GeV
J. Adamczewski-Musch, O. Arnold, C. Behnke +114
We investigate identical pion HBT intensity interferometry for central Au+Au collisions at 1.23A GeV. High-statistics and data are measured with HADES at SIS1…
Correlated pion-proton pair emission off hot and dense QCD matter
J. Adamczewski-Musch, O. Arnold, C. Behnke +119
In this letter we report the first multi-differential measurement of correlated pion-proton pairs from 2 billion Au+Au collisions at \sqrt{s_{NN}} = 2.42 GeV collected with HADES.…
Lambda-p femtoscopy in collisions of Ar+KCl at 1.76 AGeV
G. Agakishiev, A. Balanda, R. Bassini +103
Results on p femtoscopy are reported at the lowest energy so far. At a beam energy of 1.76A~GeV, the reaction Ar+KCl was studied with the High Acceptance Di-Electron Spectromet…
pK+Îfinal state: towards the extraction of the ppK- contribution
L. Fabbietti, G. Agakishiev, A. Balanda +99
The reaction p(@3.5\,GeV)+p -> p+Î+ K^+ can be studied to search for the existence of kaonic bound states like ppK^- leading to this final state. This effort has been motivated by…
Deep sub-threshold Ï production and implications for the K+/K- freeze-out in Au+Au collisions
J. Adamczewski-Musch, O. Arnold, C. Behnke +110
We present data on charged kaons (K+-) and Ï mesons in Au(1.23A GeV)+Au collisions. It is the first simultaneous measurement of K and Ï mesons in central heavy-ion collisions bel…
Cross section in deuteron-proton elastic scattering at 1.25 GeV/u
HADES Collaboration, P. K. Kurilkin, G. Agakishiev +98
First results of the differential cross section in dp elastic scattering at 1.25 GeV/u measured with the HADES over a large angular range are reported. The obtained data correspond…
Charged pion production in collisions at = 2.4
J. Adamczewski-Musch, O. Arnold, C. Behnke +125
We present high-statistic data on charged pion emission from Au+Au collisions at = 2.4 GeV (corresponding to = 1.23 A GeV) in four centrality classe…
Sub-threshold production of K^{0}_{s} mesons and Î hyperons in Au(1.23A GeV)+Au
HADES collaboration, J. Adamczewski-Musch, O. Arnold +113
We present first data on sub-threshold production of K0 s mesons and Î hyperons in Au+Au collisions at = 2.4 GeV. We observe an universal <Apart> scaling of hadron…
Two-Pion production in the second resonance region in collisions with HADES
J. Adamczewski-Musch, O. Arnold, E. T. Atomssa +117
Pion induced reactions provide unique opportunities for an unambiguous description of baryonic resonances and their coupling channels by means of a partial wave analysis. Using the…
Hyperon production in Ar+KCl collisions at 1.76A GeV
G. Agakishiev, A. Balanda, B. Bannier +111
We present transverse momentum spectra, rapidity distribution and multiplicity of Lambda-hyperons measured with the HADES spectrometer in the reaction Ar(1.76A GeV)+KCl. The yield…
Strong absorption of hadrons with hidden and open strangeness in nuclear matter
J. Adamczewski-Musch, O. Arnold, E. T. Atomssa +115
We present the first observation of K- and Ïabsorption within nuclear matter by means of Ï- -induced reactions on C and W targets at an incident beam momentum of 1.7 GeV/c studie…
The High-Acceptance Dielectron Spectrometer HADES
The HADES Collaboration, G. Agakishiev, A. Balanda +110
HADES is a versatile magnetic spectrometer aimed at studying dielectron production in pion, proton and heavy-ion induced collisions. Its main features include a ring imaging gas Ch…
An upper limit on hypertriton production in collisions of Ar(1.76 AGeV)+KCl
HADES Collaboration, G. Agakishiev, D. Belver +95
A high-statistic data sample of Ar(1.76 AGeV)+KCl events recorded with HADES is used to search for a hypertriton signal. An upper production limit per centrality-triggered event of…
Proton number fluctuations in = 2.4 GeV Au+Au collisions studied with HADES
J. Adamczewski-Musch, O. Arnold, C. Behnke +117
We present an analysis of proton number fluctuations in = 2.4 GeV Au+Au collisions measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI. With th…
Single and double pion production in np collisions at 1.25 GeV with HADES
The HADES Collaboration, A. K. Kurilkin, G. Agakishiev +98
The preliminary results on charged pion production in np collisions at an incident beam energy of 1.25 GeV measured with HADES are presented. The np reactions were isolated in dp c…
Subthreshold Xi- Production in Collisions of p(3.5 GeV)+Nb
G. Agakishiev, O. Arnold, A. Balanda +95
Results on the production of the double-strange cascade hyperon are reported for collisions of p\,(3.5~GeV)\,+\,Nb, studied with the High Acceptance Di-Electron Spe…
Deep sub-threshold production in Ar+KCl reactions at 1.76A GeV
G. Agakishiev, A. Balanda, R. Bassini +101
We report first results on a deep sub-threshold production of the doubly strange hyperon in a heavy-ion reaction. At a beam energy of 1.76A GeV the reaction Ar+KCl was studi…
Polarization Transfer Observables in Elastic Electron Proton Scattering at 2.5, 5.2, 6.8, and 8.5 GeV
A. J. R. Puckett, E. J. Brash, M. K. Jones +104
The GEp-III and GEp-2 experiments were carried out in Jefferson Lab's (JLab's) Hall C from 2007-2008, to extend the knowledge of to the highest practically achiev…
Impact of the Coulomb field on charged-pion spectra in few-GeV heavy-ion collisions
J. Adamczewski-Musch, O. Arnold, C. Behnke +124
In nuclear collisions the incident protons generate a Coulomb field which acts on produced charged particles. The impact of these interactions on charged pion transverse-mass and r…
Centrality determination of Au+Au collisions at 1.23A GeV with HADES
HADES collaboration, J. Adamczewski-Musch, O. Arnold +106
The centrality determination for Au+Au collisions at 1.23A GeV, as measured with HADES at the GSI-SIS18, is described. In order to extract collision geometry related quantities, su…
Associate K^0 production in p+p collisions at 3.5 GeV: The role of Delta(1232)++
G. Agakishiev, O. Arnold, A. Balanda +97
An exclusive analysis of the 4-body final states and measured with HADES for p+p collisions at a beam kinet…
(1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES
J. Adamczewski-Musch, O. Arnold, E. T. Atomssa +114
We report on the investigation of (1232) production and decay in proton-proton collisions at a kinetic energy of 1.25 GeV measured with HADES. Exclusive dilepton decay channels…
Analysis of pion production data measured by HADES in proton-proton collisions at 1.25 GeV
G. Agakishiev, A. Balanda, D. Belver +97
Baryon resonance production in proton-proton collisions at a kinetic beam energy of 1.25 GeV is investigated. The multi-differential data were measured by the HADES collaboration.…
Charged pion production in C+C and Ar+KCl collisions measured with HADES
The HADES Collaboration, P. Tlusty, G. Agakishiev +110
Results of a study of charged pion production in 12C+12C collisions at incident beam energies of 1A GeV and 2A GeV, and 40Ar+natKCl at 1.76AGeV, using the spectrometer HADES at GSI…
Directed, elliptic and higher order flow harmonics of protons, deuterons and tritons in Au+Au collisions at GeV
HADES collaboration, J. Adamczewski-Musch, O. Arnold +123
Flow coefficients of the orders are measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI for protons, deuterons and tritons as a function of…
Inclusive Î production in proton-proton collisions at 3.5 GeV
J. Adamczewski-Musch, G. Agakishiev, O. Arnold +106
The inclusive production of Î hyperons in proton-proton collisions at = 3.18 GeV was measured with HADES at the GSI Helmholtzzentrum für Schwerionenforschung in Darmst…
The interaction studied via femtoscopy in p + Nb reactions at
J. Adamczewski-Musch, G. Agakishiev, O. Arnold +103
We report on the first measurement of and correlations via the femtoscopy method in p+Nb reactions at , studied with the High…
Dielectron production in Ar+KCl collisions at 1.76A GeV
G. Agakishiev, A. Balanda, D. Belver +98
We present results on dielectron production in Ar+KCl collisions at 1.76A GeV. For the first time mesons could be reconstructed in a heavy-ion reaction at a bombarding energy…
Analysis of the exclusive final state npee in quasi-free np reaction
J. Adamczewski-Musch, O. Arnold, E. T. Atomssa +114
We report on the investigation of dielectron production in tagged quasi-free neutron-proton collisions by using a deuteron beam of kinetic energy 1.25 GeV/u inpinging on a liquid h…
Production of Sigma{\pm}pi?pK+ in p+p reactions at 3.5 GeV beam energy
G. Agakishiev, A. Balanda, D. Belver +98
We study the production of Sigma^+-pi^+-pK^+ particle quartets in p+p reactions at 3.5 GeV kinetic beam energy. The data were taken with the HADES experiment at GSI. This report ev…
Polarization components in photoproduction at photon energies up to 5.6 GeV
W. Luo, E. J. Brash, R. Gilman +107
We present new data for the polarization observables of the final state proton in the reaction. These data can be used to test predictions based on ha…
Baryonic resonances close to the Kbar-N threshold: the case of Lambda(1405) in pp collisions
G. Agakishiev, A. Balanda, D. Belver +92
We present an analysis of the Lambda(1405) resonance produced in the reaction p+p->Sigma^{pm}+pi^{mp}+K+p at 3.5 GeV kinetic beam energy measured with HADES at GSI. The two charged…
Recent results from HADES on electron pair production in relativistic heavy-ion collisions
The HADES Collaboration, T. Galatyuk, G. Agakishiev +97
Systematic investigations of dilepton production are performed at the SIS accelerator of GSI with the HADES spectrometer. The goal of this program is a detailed understanding of di…
Study of exclusive one-pion and one-eta production using hadron and dielectron channels in pp reactions at kinetic beam energies of 1.25 GeV and 2.2 GeV with HADES
HADES Collaboration, G. Agakishiev, H. Alvarez-Pol +93
We present measurements of exclusive Ï^{+,0} and η production in pp reactions at 1.25 GeV and 2.2 GeV beam kinetic energy in hadron and dielectron channels. In the case of Ï^+ a…
K*(892)+ production in proton-proton collisions at E_beam = 3.5 GeV
HADES Collaboration, G. Agakishiev, O. Arnold +96
We present results on the K*(892)+ production in proton-proton collisions at a beam energy of E = 3.5 GeV, which is hitherto the lowest energy at which this mesonic resonance has b…