Measurement of the cross section for hard exclusive π0 muoproduction on the proton

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24510%2F20%3A00008684" target="_blank" >RIV/46747885:24510/20:00008684 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0370269320302586" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0370269320302586</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2020.135454" target="_blank" >10.1016/j.physletb.2020.135454</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Measurement of the cross section for hard exclusive π0 muoproduction on the proton

Popis výsledku v původním jazyce

We report on a measurement of hard exclusive π muoproduction on the proton by COMPASS using 160 GeV/c polarised μ and μ beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured μ and μ cross sections, the virtual-photon proton cross section is determined as a function of the squared four-momentum transfer between initial and final proton in the range 0.08(GeV/c) =2.0(GeV/c) , =12.8GeV, =0.093 and =0.256(GeV/c) . Fitting the azimuthal dependence reveals a combined contribution by transversely and longitudinally polarised photons of (8.2±0.9;)nb/(GeV/c) , as well as transverse-transverse and longitudinal-transverse interference contributions of (−6.1±1.3;)nb/(GeV/c) and (1.5±0.5;)nb/(GeV/c) , respectively. Our results provide important input for modelling Generalised Parton Distributions. In the context of the phenomenological Goloskokov-Kroll model, the statistically significant transverse-transverse interference contribution constitutes clear experimental evidence for the chiral-odd GPD E_T.

Název v anglickém jazyce

Measurement of the cross section for hard exclusive π0 muoproduction on the proton

Popis výsledku anglicky

We report on a measurement of hard exclusive π muoproduction on the proton by COMPASS using 160 GeV/c polarised μ and μ beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured μ and μ cross sections, the virtual-photon proton cross section is determined as a function of the squared four-momentum transfer between initial and final proton in the range 0.08(GeV/c) =2.0(GeV/c) , =12.8GeV, =0.093 and =0.256(GeV/c) . Fitting the azimuthal dependence reveals a combined contribution by transversely and longitudinally polarised photons of (8.2±0.9;)nb/(GeV/c) , as well as transverse-transverse and longitudinal-transverse interference contributions of (−6.1±1.3;)nb/(GeV/c) and (1.5±0.5;)nb/(GeV/c) , respectively. Our results provide important input for modelling Generalised Parton Distributions. In the context of the phenomenological Goloskokov-Kroll model, the statistically significant transverse-transverse interference contribution constitutes clear experimental evidence for the chiral-odd GPD E_T.

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

2020

Kód důvěrnosti údajů

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

Název periodika

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ISSN

0370-2693

e-ISSN

—

Svazek periodika

805

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

—

Kód UT WoS článku

000541379800025

EID výsledku v databázi Scopus

2-s2.0-85084498386