Measurement of the Charged-Pion Polarizability
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10318930" target="_blank" >RIV/00216208:11320/15:10318930 - isvavai.cz</a>
Alternative codes found
RIV/68081731:_____/15:00444300 RIV/68407700:21340/15:00226048
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Measurement of the Charged-Pion Polarizability
Original language description
The COMPASS collaboration at CERN has investigated pion Compton scattering, pi(-)gamma -> pi(-)gamma, at centerof-mass energy below 3.5 pion masses. The process is embedded in the reaction pi Ni- -> pi(-)gamma Ni, which is initiated by 190 GeV pions impinging on a nickel target. The exchange of quasireal photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, Q(2) < 0.0015 (GeV/c)(2). From a sample of 63 000 events, the pion electric polarizability is determinedto be alpha(pi) = (2.0 +/- 0.6(stat) +/- 0.7(syst)) x 10(-4) fm(3) under the assumption alpha(pi) = -beta(pi) which relates the electric and magnetic dipole polarizabilities. It is the most precise measurement of this fundamental low-energy parameter ofstrong interaction that has been addressed since long by various methods with conflicting outcomes. While this result is in tension with previous dedicated measurements, it is found in agreement with the expectation from chiral perturbati
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BF - Elementary particle theory and high energy physics
OECD FORD branch
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Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review Letters
ISSN
0031-9007
e-ISSN
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Volume of the periodical
114
Issue of the periodical within the volume
6
Country of publishing house
US - UNITED STATES
Number of pages
6
Pages from-to
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UT code for WoS article
000349490200002
EID of the result in the Scopus database
2-s2.0-84922788721