Spin rotation effects in diffractive electroproduction of heavy quarkonia

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F19%3A00503168" target="_blank" >RIV/61389005:_____/19:00503168 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/19:00329677

Výsledek na webu

<a href="https://doi.org/10.1140/epjc/s10052-019-6666-y" target="_blank" >https://doi.org/10.1140/epjc/s10052-019-6666-y</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1140/epjc/s10052-019-6666-y" target="_blank" >10.1140/epjc/s10052-019-6666-y</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Spin rotation effects in diffractive electroproduction of heavy quarkonia

Popis výsledku v původním jazyce

In this work we present for the first time the comprehensive study of the Melosh spin rotation effects in diffractive electroproduction of S-wave heavy quarkonia off a nucleon target. Such a study has been performed within the color dipole approach using, as an example and a reference point, two popular parametrizations of the dipole cross section and two potentials describing the interaction between Q and Q and entering in the Schrodinger equation based formalism for determination of the quarkonia wave functions. We find a strong onset of spin rotation effects in 1S charmonium photoproduction which is obviously neglected in present calculations of corresponding cross sections. For photoproduction of radially excited (2S) these effects are even stronger leading to an increase of the photoproduction cross section by a factor of 2 divided by 3 depending on the photon energy. Even in production of radially excited ?(2S) and ?(3S) they can not be neglected and cause the 20-30% enhancement of the photoproduction cross section. Finally, we predict that the spin effects vanish gradually with photon virtuality Q2 following universality properties in production of different heavy quarkonia as a function of Q2+MV2.

Název v anglickém jazyce

Spin rotation effects in diffractive electroproduction of heavy quarkonia

Popis výsledku anglicky

In this work we present for the first time the comprehensive study of the Melosh spin rotation effects in diffractive electroproduction of S-wave heavy quarkonia off a nucleon target. Such a study has been performed within the color dipole approach using, as an example and a reference point, two popular parametrizations of the dipole cross section and two potentials describing the interaction between Q and Q and entering in the Schrodinger equation based formalism for determination of the quarkonia wave functions. We find a strong onset of spin rotation effects in 1S charmonium photoproduction which is obviously neglected in present calculations of corresponding cross sections. For photoproduction of radially excited (2S) these effects are even stronger leading to an increase of the photoproduction cross section by a factor of 2 divided by 3 depending on the photon energy. Even in production of radially excited ?(2S) and ?(3S) they can not be neglected and cause the 20-30% enhancement of the photoproduction cross section. Finally, we predict that the spin effects vanish gradually with photon virtuality Q2 following universality properties in production of different heavy quarkonia as a function of Q2+MV2.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

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

2019

Kód důvěrnosti údajů

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

Název periodika

European Physical Journal C

ISSN

1434-6044

e-ISSN

—

Svazek periodika

79

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

154

Kód UT WoS článku

000459318400003

EID výsledku v databázi Scopus

2-s2.0-85061817661