Inelastic electron-nucleus interactions at 5 GeV detected by ARGUS

Degtyarenko, P. V.; Efremenko, Y. V.; Gavrilov, V.; Leksin, G.A.; Semenova, N. L.

doi:10.1007/bf01294478

Cited by 7 publications

(8 citation statements)

References 10 publications

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“…For NR case the "internal" momentum corresponds to the relative momentum of two nucleons in the lab, while in LC it is defined according to Eq. (93). This results in a qualitatively different relation between the wave function and the scattering amplitude for large nucleon momenta.…”

Section: Light Cone Quantum Mechanics Of Nucleimentioning

confidence: 95%

“…It is worth noting that this is a scale expected in quark exchange models of NN interaction [6]. In addition, there exist data on inclusive production of ∆'s in e − "air" scattering at E e = 5 GeV and at large α ≥ 1 which allowed to estimate the ratio of ∆ ++ and proton yields for same α of the order 5% [93]. The latter corresponds to the order of 10% high momentum component per nucleon in the nuclear ground state wave function due to ∆-isobars.…”

Section: Looking For Src Involving ∆-Isobarsmentioning

confidence: 99%

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Recent Observation of Short-Range Nucleon Correlations in Nuclei and Their Implications for the Structure of Nuclei and Neutron Stars

Frankfurt

Sargsian

Strikman

2008

Int. J. Mod. Phys. A

167

232

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Novel processes probing the decay of nucleus after removal of a nucleon with momentum larger than Fermi momentum by hard probes finally proved unambiguously the evidence for long sought presence of short-range correlations (SRCs) in nuclei. In combination with the analysis of large Q 2 , A(e,e')X processes at x > 1 they allow us to conclude that (i) practically all nucleons with momenta ≥ 300 MeV/c belong to SRCs, consisting mostly of two nucleons, ii) probability of such SRCs in medium and heavy nuclei is ∼ 25%, iii) a fast removal of such nucleon practically always leads to emission of correlated nucleon with approximately opposite momentum, iv) proton removal from twonucleon SRCs in 90% of cases is accompanied by a removal of a neutron and only in 10% by a removal of another proton. We explain that observed absolute probabilities and the isospin structure of two nucleon SRCs confirm the 1 arXiv:0806.4412v2 [nucl-th] 4 Sep 2008important role that tensor forces play in internucleon interactions. We find also that the presence of SRCs requires modifications of the Landau Fermi liquid approach to highly asymmetric nuclear matter and leads to a significantly faster cooling of cold neutron stars with neutrino cooling operational even for N p /N n ≤ 0.1. The effect is even stronger for the hyperon stars. Theoretical challenges raised by the discovered dominance of nucleon degrees of freedom in SRCs and important role of the spontaneously broken chiral symmetry in quantum chromodynamics (QCD) in resolving them are considered. We also outline directions for future theoretical and experimental studies of the physics relevant for SRCs.

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Section: Light Cone Quantum Mechanics Of Nucleimentioning

confidence: 95%

Section: Looking For Src Involving ∆-Isobarsmentioning

confidence: 99%

Recent Observation of Short-Range Nucleon Correlations in Nuclei and Their Implications for the Structure of Nuclei and Neutron Stars

Frankfurt

Sargsian

Strikman

2008

Int. J. Mod. Phys. A

167

232

View full text Add to dashboard Cite

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“…Ab initio calculations of the nuclear ground state are successful for nuclei up to A = 8 and higher [1100,1101] and lattice QCD calculations continue to make progress toward a fundamental understanding of the nucleon The size parameter r rms as a function of the mean pair momentum p = | p 1 + p 2 |/2 is shown for different nuclear targets [1095]. Data from Refs [1096,1097,1098] are shown which correspond to e − 16 O interactions at initial energy of 5 GeV and Q 2 < 0.1(GeV/c) 2 are shown for comparison. Right panel: Preliminary correlation functions for π + π + from the CLAS detector at Jefferson Lab [1099].…”

Section: Bose-einstein Correlations At An Electron-ion Collidermentioning

confidence: 99%

Gluons and the quark sea at high energies: distributions, polarization, tomography

Boer¹,

Diehl²,

Milner³

et al. 2011

198

291

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ForewordThe study of the fundamental structure of nuclear matter is a central thrust of physics research in the United States. As indicated in Frontiers of Nuclear Science, the 2007 Nuclear Science Advisory Committee long range plan, consideration of a future Electron-Ion Collider (EIC) is a priority and will likely be a significant focus of discussion at the next long range plan. We are therefore pleased to have supported the ten week program in fall 2010 at the Institute of Nuclear Theory which examined at length the science case for the EIC. This program was a major effort; it attracted the maximum allowable attendance over ten weeks.This report summarizes the current understanding of the physics and articulates important open questions that can be addressed by an EIC. It converges towards a set of "golden" experiments that illustrate both the science reach and the technical demands on such a facility, and thereby establishes a firm ground from which to launch the next phase in preparation for the upcoming long range plan discussions. We thank all the participants in this productive program. In particular, we would like to acknowledge the leadership and dedication of the five co-organizers of the program who are also the co-editors of this report.David Kaplan, Director, National Institute for Nuclear Theory Hugh Montgomery, Director, Thomas Jefferson National Accelerator Facility Steven Vigdor, Associate Lab Director, Brookhaven National Laboratory iii Preface This volume is based on a ten-week program on "Gluons and the quark sea at high energies", which took place at the Institute for Nuclear Theory (INT) in Seattle from September 13 to November 19, 2010. The principal aim of the program was to develop and sharpen the science case for an Electron-Ion Collider (EIC), a facility that will be able to collide electrons and positrons with polarized protons and with light to heavy nuclei at high energies, offering unprecedented possibilities for in-depth studies of quantum chromodynamics. Guiding questions were• What are the crucial science issues?• How do they fit within the overall goals for nuclear physics?• Why can't they be addressed adequately at existing facilities?• Will they still be interesting in the 2020's, when a suitable facility might be realized?The program started with a five-day workshop on "Perturbative and Non-Perturbative Aspects of QCD at Collider Energies", which was followed by eight weeks of regular program and a concluding four-day workshop on "The Science Case for an EIC".More than 120 theorists and experimentalists took part in the program over ten weeks. It was only possible to smoothly accommodate such a large number of participants because of the extraordinary efforts of the INT staff, to whom we extend our warm thanks and appreciation. We thank the INT Director, David Kaplan, for his strong support of the program and for covering a significant portion of the costs for printing this volume. We gratefully acknowledge additional financial support provided by BNL and JLab.The program w...

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“…The procedure for selecting the beam-gas events was described in [10]. Here follow the criteria for selcting events where e -+ collide with 160 nuclei: 2.…”

Section: Data Analysis Proceduresmentioning

confidence: 99%

“…We previously reported [10] the data on inclusive production cross sections and the preliminary results of determining the size of an interaction region (interferometry measurements) derived from analysis of this data sample. In the present study, we have concentrated on how correlated proton pairs affect the general characteristics of the reaction, namely, multiplicity of the secondary protons Np in the event and total deposited energy E h. In particular, we would like to investigate the behaviour of the relation between r and n as a function of the selected general characteristics of the reaction.…”

Section: Introductionmentioning

confidence: 98%

The dependence of proton correlations on integral characteristics of eA interactions

Degtyarenko¹,

Doroshkevich²,

Efremenko³

et al. 1994

Z. Physik A - Hadrons and Nuclei

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Abstract.We report the results of analysis of correlations of the product protons from inelastic eA collisions at small Q2. The experimental data were measured by the ARGUS detector. The correlation effect at small relative momenta q (interference and final state interaction) is closely associated with the angular correlations due to momentum conservation. The examined correlations in eA collisions also show features similar to correlations in hA collisions.

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Inelastic electron-nucleus interactions at 5 GeV detected by ARGUS

Cited by 7 publications

References 10 publications

Recent Observation of Short-Range Nucleon Correlations in Nuclei and Their Implications for the Structure of Nuclei and Neutron Stars

Recent Observation of Short-Range Nucleon Correlations in Nuclei and Their Implications for the Structure of Nuclei and Neutron Stars

Gluons and the quark sea at high energies: distributions, polarization, tomography

The dependence of proton correlations on integral characteristics of eA interactions

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