K + Lambda photo- and eletroproduction off proton

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F20%3A00532074" target="_blank" >RIV/61389005:_____/20:00532074 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1063/5.0008575" target="_blank" >http://dx.doi.org/10.1063/5.0008575</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0008575" target="_blank" >10.1063/5.0008575</a>

Jazyk výsledku

angličtina

Název v původním jazyce

K + Lambda photo- and eletroproduction off proton

Popis výsledku v původním jazyce

Exploiting the isobar and Regge-plus-resonance models, we study photo- and electroproduction of K+Lambda. Recently, we included to our models a new formalism for exchanges of high-spin (3/2 and 5/2) baryon fields which were found to be important for data description. Moreover, we introduced also energy-dependent widths of the nucleon resonances to the isobar model, which aim at correcting unitarity broken in our tree-level approach. In order to achieve a reliable description of K+Lambda electroproduction with the isobar model, we considered including electromagnetic form factors and longitudinal couplings of virtual photons which appeared to be a necessity at small photon virtuality. In the Regge-plus-resonance approach, we focused mainly on the issue of gauge invariance, being broken by Reggeizing the t-channel current. We use a recently proposed method for restoring gauge invariance and achieve an acceptable data description. We also discuss the changes the choice of either pseudoscalar or pseudovector coupling in the strong vertex makes for cross-section predictions in kinematic regions where data are scarce. The majority of nucleon resonances selected in the analysis with the Regge-plus-resonance models overlap with other sets chosen with the isobar models.

Název v anglickém jazyce

K + Lambda photo- and eletroproduction off proton

Popis výsledku anglicky

Exploiting the isobar and Regge-plus-resonance models, we study photo- and electroproduction of K+Lambda. Recently, we included to our models a new formalism for exchanges of high-spin (3/2 and 5/2) baryon fields which were found to be important for data description. Moreover, we introduced also energy-dependent widths of the nucleon resonances to the isobar model, which aim at correcting unitarity broken in our tree-level approach. In order to achieve a reliable description of K+Lambda electroproduction with the isobar model, we considered including electromagnetic form factors and longitudinal couplings of virtual photons which appeared to be a necessity at small photon virtuality. In the Regge-plus-resonance approach, we focused mainly on the issue of gauge invariance, being broken by Reggeizing the t-channel current. We use a recently proposed method for restoring gauge invariance and achieve an acceptable data description. We also discuss the changes the choice of either pseudoscalar or pseudovector coupling in the strong vertex makes for cross-section predictions in kinematic regions where data are scarce. The majority of nucleon resonances selected in the analysis with the Regge-plus-resonance models overlap with other sets chosen with the isobar models.

Druh

D - Stať ve sborníku

CEP obor

—

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/GA19-19640S" target="_blank" >GA19-19640S: Studium interakcí hadronů, jejich produkce a vázaných stavů</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název statě ve sborníku

AIP Conference Proceedings

ISBN

9780735420083

ISSN

0094-243X

e-ISSN

—

Počet stran výsledku

7

Strana od-do

030042

Název nakladatele

AIP Publishing

Místo vydání

Melville

Místo konání akce

Pittsburgh

Datum konání akce

2. 6. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000598358500013