Longitudinal double-spin asymmetry Ap1 and spin-dependent structure function gp1 of the proton at small values of x and Q2

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F18%3A00321305" target="_blank" >RIV/68407700:21230/18:00321305 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21340/18:00321305

Result on the web

<a href="https://doi.org/10.1016/j.physletb.2018.03.044" target="_blank" >https://doi.org/10.1016/j.physletb.2018.03.044</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2018.03.044" target="_blank" >10.1016/j.physletb.2018.03.044</a>

Result language

angličtina

Original language name

Longitudinal double-spin asymmetry Ap1 and spin-dependent structure function gp1 of the proton at small values of x and Q2

Original language description

We present a precise measurement of the proton longitudinal double-spin asymmetry A1p and the proton spin-dependent structure function g1p at photon virtualities 0.006(GeV/c)2<Q2<1(GeV/c)2 in the Bjorken x range of 4x10-5<x<4x10-2 . The results are based on data collected by the COMPASS Collaboration at CERN using muon beam energies of 160GeV and 200GeV . The statistical precision is more than tenfold better than that of the previous measurement in this region. In the whole range of x , the measured values of A1p and g1p are found to be positive. It is for the first time that spin effects are found at such low values of x .

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10303 - Particles and field physics

Project

<a href="/en/project/LM2015058" target="_blank" >LM2015058: Research Infrastructure for Experiments at CERN</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

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

Name of the periodical

Physics Letters B

ISSN

0370-2693

e-ISSN

1873-2445

Volume of the periodical

781

Issue of the periodical within the volume

červen

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

9

Pages from-to

464-472

UT code for WoS article

000435653100059

EID of the result in the Scopus database

2-s2.0-85045934608