Analysis of the exclusive final state npe(+)e(-) in the quasi-free np reaction
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F17%3A00477405" target="_blank" >RIV/61389005:_____/17:00477405 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1140/epja/i2017-12341-3" target="_blank" >http://dx.doi.org/10.1140/epja/i2017-12341-3</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1140/epja/i2017-12341-3" target="_blank" >10.1140/epja/i2017-12341-3</a>
Alternative languages
Result language
angličtina
Original language name
Analysis of the exclusive final state npe(+)e(-) in the quasi-free np reaction
Original language description
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 impinging on a liquid hydrogen target. Our measurements with HADES confirm a significant excess of e(+)e(-) pairs above the pi(0) mass in the exclusive channel dp -> npe(+)e(-)(p(spect)) as compared to the exclusive channel ppe(+)e(-) measured in proton-proton collisions at the same energy. That excess points to different bremsstrahlung production mechanisms. Two models were evaluated for the role of the charged pion exchange between nucleons and double-Delta excitation combined with intermediate rho-meson production. Differential cross sections as a function of the e(+)e(-) invariant mass and of the angles of the virtual photon, proton and electrons provide valuable constraints and encourage further investigations on both experimental and theoretical sides.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10304 - Nuclear physics
Result continuities
Project
<a href="/en/project/GA13-06759S" target="_blank" >GA13-06759S: Experimental Study of Hadrons in the Baryonic Medium</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
European Physical Journal A
ISSN
1434-6001
e-ISSN
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Volume of the periodical
53
Issue of the periodical within the volume
7
Country of publishing house
US - UNITED STATES
Number of pages
12
Pages from-to
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UT code for WoS article
000405609000001
EID of the result in the Scopus database
2-s2.0-85024371848