Beam helicity asymmetries in K+Lambda electroproduction off the proton at low Q(2)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F17%3A00480791" target="_blank" >RIV/61389005:_____/17:00480791 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1140/epja/i2017-12395-1" target="_blank" >http://dx.doi.org/10.1140/epja/i2017-12395-1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1140/epja/i2017-12395-1" target="_blank" >10.1140/epja/i2017-12395-1</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Beam helicity asymmetries in K+Lambda electroproduction off the proton at low Q(2)

Popis výsledku v původním jazyce

Beam helicity asymmetries in the (e) over right arrowp -> e'K+Lambda reaction have been measured at unprecedentedly low four-momentum transfers < Q(2)> = 0.05 (GeV/c)(2). At the Mainz Microtron (MAMI), the experiment was performed with a longitudinally polarized beam and an out-of-plane detection of the scattered electron. This experiment probed the associated helicity-dependent structure function d sigma(LT')/d Omega(c.m.)(K), which is sensitive to the details of resonances of the proton. The results were compared to models for kaon electroproduction using effective Lagrangians. The MAMI data is not supporting the Kaon-Maid isobar model, which uses strong longitudinal couplings of the virtual photon to nucleon resonances and predicts a strong peaking of the structure function at forward angles and low Q(2). The data is also in disagreement with a Regge-plus-resonance model that predicts the incorrect sign of the structure function. The combination of the MAMI results with data taken at higher four-momentum transfers measured at Jefferson Lab indicates a smooth transition in Q(2) without significant changes of the interference pattern in the electroproduction process.

Název v anglickém jazyce

Beam helicity asymmetries in K+Lambda electroproduction off the proton at low Q(2)

Popis výsledku anglicky

Beam helicity asymmetries in the (e) over right arrowp -> e'K+Lambda reaction have been measured at unprecedentedly low four-momentum transfers < Q(2)> = 0.05 (GeV/c)(2). At the Mainz Microtron (MAMI), the experiment was performed with a longitudinally polarized beam and an out-of-plane detection of the scattered electron. This experiment probed the associated helicity-dependent structure function d sigma(LT')/d Omega(c.m.)(K), which is sensitive to the details of resonances of the proton. The results were compared to models for kaon electroproduction using effective Lagrangians. The MAMI data is not supporting the Kaon-Maid isobar model, which uses strong longitudinal couplings of the virtual photon to nucleon resonances and predicts a strong peaking of the structure function at forward angles and low Q(2). The data is also in disagreement with a Regge-plus-resonance model that predicts the incorrect sign of the structure function. The combination of the MAMI results with data taken at higher four-momentum transfers measured at Jefferson Lab indicates a smooth transition in Q(2) without significant changes of the interference pattern in the electroproduction process.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Projekt

<a href="/cs/project/GA15-04301S" target="_blank" >GA15-04301S: Interakce hadronů s nukleony a jádry</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

European Physical Journal A

ISSN

1434-6001

e-ISSN

—

Svazek periodika

53

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

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Kód UT WoS článku

000413306000001

EID výsledku v databázi Scopus

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