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Title: Nuclear effects in leptoproduction of secondaries

Abstract

We estimate the energy losses in the case of deep-inelastic scattering on nuclear targets in terms of the effective change of the virtual photon energy. Our phenomenological results are in reasonable agreement with theoretical calculations. The difference in secondary production processes in hard and soft interactions is discussed.

Authors:
;  [1];  [2]
  1. St. Petersburg State Polytechnic University (Russian Federation), E-mail: mryzhinskiy@phmf.spbstu.ru
  2. RAS, Petersburg Nuclear Physics Institute (Russian Federation), E-mail: shabelsk@thd.pnpi.spb.ru
Publication Date:
OSTI Identifier:
21075892
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Atomic Nuclei; Journal Volume: 70; Journal Issue: 4; Other Information: DOI: 10.1134/S1063778807040151; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Ltd; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DEEP INELASTIC SCATTERING; ENERGY LOSSES; PARTICLE PRODUCTION; PHOTON-NUCLEON INTERACTIONS; PHOTONS

Citation Formats

Berdnikov, Ya. A., Ryzhinskiy, M. M., and Shabelski, Yu. M.. Nuclear effects in leptoproduction of secondaries. United States: N. p., 2007. Web. doi:10.1134/S1063778807040151.
Berdnikov, Ya. A., Ryzhinskiy, M. M., & Shabelski, Yu. M.. Nuclear effects in leptoproduction of secondaries. United States. doi:10.1134/S1063778807040151.
Berdnikov, Ya. A., Ryzhinskiy, M. M., and Shabelski, Yu. M.. Sun . "Nuclear effects in leptoproduction of secondaries". United States. doi:10.1134/S1063778807040151.
@article{osti_21075892,
title = {Nuclear effects in leptoproduction of secondaries},
author = {Berdnikov, Ya. A. and Ryzhinskiy, M. M. and Shabelski, Yu. M.},
abstractNote = {We estimate the energy losses in the case of deep-inelastic scattering on nuclear targets in terms of the effective change of the virtual photon energy. Our phenomenological results are in reasonable agreement with theoretical calculations. The difference in secondary production processes in hard and soft interactions is discussed.},
doi = {10.1134/S1063778807040151},
journal = {Physics of Atomic Nuclei},
number = 4,
volume = 70,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}
  • The A dependence of hadron leptoproduction from nuclear targets is interpreted as a measurement of inclusive inelastic and possibly also quasielastic quark-nucleon cross sections. The formulas which allow us to extract these cross sections from the data are derived and discussed. Numerical estimates indicate that the measurement of the total inelastic quark-nucleon cross section is perfectly feasible. Measurement of differential inclusive cross sections of the reaction quark+nucleon ..-->.. quark+anything is possible as well but requires experiments with rather high statistics. Implications of our calculations for the process of heavy-lepton pair production from nuclear targets are also briefly discussed.
  • The first measurements of double-hadron production in deep-inelastic scattering within the nuclear medium were made with the HERMES spectrometer at DESY HERA using a 27.6 GeV positron beam. By comparing data for deuterium, nitrogen, krypton, and xenon nuclei, the influence of the nuclear medium on the ratio of double-hadron to single-hadron yields was investigated. Nuclear effects on the additional hadron are clearly observed, but with little or no difference among nitrogen, krypton, or xenon, and with smaller magnitude than effects seen on previously measured single-hadron multiplicities. The data are compared with models based on partonic energy loss or prehadronic scatteringmore » and with a model based on a purely absorptive treatment of the final-state interactions. Thus, the double-hadron ratio provides an additional tool for studying modifications of hadronization in nuclear matter.« less
  • Many population synthesis and stellar evolution studies have addressed the evolution of close binary systems in which the primary is a compact remnant and the secondary is filling its Roche lobe, thus triggering mass transfer. Although tidal locking is expected in such systems, most studies have neglected the rotationally induced mixing that may occur. Here we study the possible effects of mixing in mass-losing stars for a range of secondary star masses and metallicities. We find that tidal locking can induce rotational mixing prior to contact and thus affect the evolution of the secondary star if the effects of themore » Spruit-Tayler dynamo are included both for angular momentum and chemical transport. Once contact is made, the effect of mass transfer tends to be more rapid than the evolutionary timescale, so the effects of mixing are no longer directly important, but the mass-transfer strips matter to inner layers that may have been affected by the mixing. These effects are enhanced for secondaries of 1-1.2 M{sub Sun} and for lower metallicities. We discuss the possible implications for the paucity of carbon in the secondaries of the cataclysmic variable SS Cyg and the black hole candidate XTE J1118+480 and for the progenitor evolution of Type Ia supernovae. We also address the issue of the origin of blue straggler stars in globular and open clusters. We find that for models that include rotation consistent with that observed for some blue straggler stars, evolution is chemically homogeneous. This leads to tracks in the H-R diagram that are brighter and bluer than the non-rotating main-sequence turn-off point. Rotational mixing could thus be one of the factors that contribute to the formation of blue stragglers.« less