Measurement of the cross section for hard exclusive pi(0) muoproduction on the proton

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F20%3A00532103" target="_blank" >RIV/68081731:_____/20:00532103 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21230/20:00344588 RIV/68407700:21340/20:00344588 RIV/00216208:11320/20:10414846

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 pi(0) muoproduction on the proton

Popis výsledku v původním jazyce

We report on a measurement of hard exclusive pi(0) muoproduction on the proton by COMPASS using 160GeV/cpolarised mu+ and mu- beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured mu+ and mu- 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) <vertical bar t vertical bar < 0.64 (GeV/c)(2). The average kinematics of the measurement are Q(2) = 2.0 (GeV/c)(2), nu = 12.8 GeV, x(Bj) = 0.093andt = 0.256 (GeV/c)(2). Fitting the azimuthal dependence reveals a combined contribution by transversely and longitudinally polarised photons of (8.2 +/- 0.9(stat-1.2)(+1.2)vertical bar(sys)) nb/(GeV/c)(2), as well as transverse-transverse and longitudinal-transverse interference contributions of (-6.1 +/- 1.3(stat- 0.7)(+0.7) vertical bar sys) nb/(GeV/c)(2) and (1.5 +/- 0.5(stat-0.2)(+ 0.3) vertical bar(sys)) nb/(GeV/c)(2), respectively. Our results provide important input for modelling Generalised Parton Distributions. In the context of the phenomenological Goloskokov-Kroll model, the statistically significant transversetransverse interference contribution constitutes clear experimental evidence for the chiral-odd GPD ET. (C) 2020 The Author(s). Published by Elsevier B.V.

Název v anglickém jazyce

Measurement of the cross section for hard exclusive pi(0) muoproduction on the proton

Popis výsledku anglicky

We report on a measurement of hard exclusive pi(0) muoproduction on the proton by COMPASS using 160GeV/cpolarised mu+ and mu- beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured mu+ and mu- 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) <vertical bar t vertical bar < 0.64 (GeV/c)(2). The average kinematics of the measurement are Q(2) = 2.0 (GeV/c)(2), nu = 12.8 GeV, x(Bj) = 0.093andt = 0.256 (GeV/c)(2). Fitting the azimuthal dependence reveals a combined contribution by transversely and longitudinally polarised photons of (8.2 +/- 0.9(stat-1.2)(+1.2)vertical bar(sys)) nb/(GeV/c)(2), as well as transverse-transverse and longitudinal-transverse interference contributions of (-6.1 +/- 1.3(stat- 0.7)(+0.7) vertical bar sys) nb/(GeV/c)(2) and (1.5 +/- 0.5(stat-0.2)(+ 0.3) vertical bar(sys)) nb/(GeV/c)(2), respectively. Our results provide important input for modelling Generalised Parton Distributions. In the context of the phenomenological Goloskokov-Kroll model, the statistically significant transversetransverse interference contribution constitutes clear experimental evidence for the chiral-odd GPD ET. (C) 2020 The Author(s). Published by Elsevier B.V.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

<a href="/cs/project/LM2015058" target="_blank" >LM2015058: Výzkumná infrastruktura pro experimenty v CERN</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 periodika

Physics Letters. B

ISSN

0370-2693

e-ISSN

—

Svazek periodika

805

Číslo periodika v rámci svazku

JUN

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

135454

Kód UT WoS článku

000541379800025

EID výsledku v databázi Scopus

2-s2.0-85084498386