First observation of long-lived pi(+)pi(-) atoms
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F15%3A00454048" target="_blank" >RIV/68378271:_____/15:00454048 - isvavai.cz</a>
Alternative codes found
RIV/61389005:_____/15:00454048 RIV/68407700:21340/15:00241086
Result on the web
<a href="http://dx.doi.org/10.1016/j.physletb.2015.09.060" target="_blank" >http://dx.doi.org/10.1016/j.physletb.2015.09.060</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.physletb.2015.09.060" target="_blank" >10.1016/j.physletb.2015.09.060</a>
Alternative languages
Result language
angličtina
Original language name
First observation of long-lived pi(+)pi(-) atoms
Original language description
After observing and investigating the double-exotic (adouble-exotic atom is a bound system, in which both oppositely charged components are unstable particles like mu, pi, K,...) pi(+)pi(-) atom with the ground state lifetime tau of about 3 x10(-15)s, the upgraded DIRAC experiment at the CERN PS accelerator observes for the first time long-lived states of the same atom with lifetimes of about 10(-11)s and more. The number of characteristic pion pairs resulting from the breakup (ionisation) of long-livedpi(+)pi(-) atoms amounts to 436 +/- 61, corresponding to a signal-to-error ratio of better than 7 standard deviations. This observation opens a new possibility to measure energy differences between p and s atomic states and so to determine pi pi scattering lengths.
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
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
Physics Letters. B
ISSN
0370-2693
e-ISSN
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Volume of the periodical
751
Issue of the periodical within the volume
DEC
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
7
Pages from-to
12-18
UT code for WoS article
000365384600003
EID of the result in the Scopus database
2-s2.0-84945176957