First measurement of proton-induced low-momentum dielectron radiation off cold nuclear matter

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F12%3A00384317" target="_blank" >RIV/61389005:_____/12:00384317 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.physletb.2012.08.004" target="_blank" >http://dx.doi.org/10.1016/j.physletb.2012.08.004</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2012.08.004" target="_blank" >10.1016/j.physletb.2012.08.004</a>

Jazyk výsledku

angličtina

Název v původním jazyce

First measurement of proton-induced low-momentum dielectron radiation off cold nuclear matter

Popis výsledku v původním jazyce

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 high statistics measurement of proton-induced dielectron radiation from cold nuclear matter in a kinematic regime, where strong medium effects are expected. Combined with the good mass resolution of 2%, it is the first measurement sensitive to changes of the spectral functions of vector mesons, as predicted by models for hadrons at rest or small relative momenta. Comparing the e(+)e(-) invariant mass spectra to elementary p + p data, we observe for e(+)e(-) momenta P-ee < 0.8 GeV/c a strong modification of the shape of the spectrum, which we attribute to an additional rho-like contribution and a decrease of omega yield. These opposite trends are tentatively interpreted as a strong coupling of the rho meson to baryonic resonances and an absorption of the omega meson, which are two aspects of in-medium modifica

Název v anglickém jazyce

First measurement of proton-induced low-momentum dielectron radiation off cold nuclear matter

Popis výsledku anglicky

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 high statistics measurement of proton-induced dielectron radiation from cold nuclear matter in a kinematic regime, where strong medium effects are expected. Combined with the good mass resolution of 2%, it is the first measurement sensitive to changes of the spectral functions of vector mesons, as predicted by models for hadrons at rest or small relative momenta. Comparing the e(+)e(-) invariant mass spectra to elementary p + p data, we observe for e(+)e(-) momenta P-ee < 0.8 GeV/c a strong modification of the shape of the spectrum, which we attribute to an additional rho-like contribution and a decrease of omega yield. These opposite trends are tentatively interpreted as a strong coupling of the rho meson to baryonic resonances and an absorption of the omega meson, which are two aspects of in-medium modifica

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BG - Jaderná, atomová a molekulová fyzika, urychlovače

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2012

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physics Letters. B

ISSN

0370-2693

e-ISSN

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Svazek periodika

715

Číslo periodika v rámci svazku

4-5

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

6

Strana od-do

304-309

Kód UT WoS článku

000308617500005

EID výsledku v databázi Scopus

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