Observation of a New Narrow Axial-Vector Meson a1(1420)
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F15%3A00231014" target="_blank" >RIV/68407700:21340/15:00231014 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1103/PhysRevLett.115.082001" target="_blank" >http://dx.doi.org/10.1103/PhysRevLett.115.082001</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevLett.115.082001" target="_blank" >10.1103/PhysRevLett.115.082001</a>
Alternative languages
Result language
angličtina
Original language name
Observation of a New Narrow Axial-Vector Meson a1(1420)
Original language description
The COMPASS Collaboration at CERN has measured diffractive dissociation of 190??GeV/c pions into the ? - ? - ? + final state using a stationary hydrogen target. A partial-wave analysis (PWA) was performed in bins of 3? mass and four-momentum transfer using the isobar model and the so far largest PWA model consisting of 88 waves. A narrow peak is observed in the f 0 (980)? channel with spin, parity and C-parity quantum numbers J_PC =1++. We present a resonance-model study of a subset of the spin-densitymatrix selecting 3? states with J PC =2++ and 4++ decaying into ?(770)? and with J_PC=1++ decaying into f 0 (980)? . We identify a new a 1 meson with mass (1414 +15 -13 )??MeV/c^2 and width (153+8-23 )??MeV/c^2. Within the final states investigated in our analysis, we observe the new a1(1420) decaying only into f_0(980)?, suggesting its exotic nature.
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
<a href="/en/project/LG13031" target="_blank" >LG13031: Collaboration of the Czech Republic with 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
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
115
Issue of the periodical within the volume
8
Country of publishing house
US - UNITED STATES
Number of pages
8
Pages from-to
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UT code for WoS article
000359872600002
EID of the result in the Scopus database
2-s2.0-84940780129