Upgraded DIRAC spectrometer at CERN PS for the investigation of pi pi and pi K atoms

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F16%3A00466587" target="_blank" >RIV/68378271:_____/16:00466587 - isvavai.cz</a>
Alternative codes found
RIV/61389005:_____/16:00466587 RIV/68407700:21340/16:00309014
Result on the web
<a href="http://dx.doi.org/10.1016/j.nima.2016.07.049" target="_blank" >http://dx.doi.org/10.1016/j.nima.2016.07.049</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.nima.2016.07.049" target="_blank" >10.1016/j.nima.2016.07.049</a>

Result language
angličtina
Original language name
Upgraded DIRAC spectrometer at CERN PS for the investigation of pi pi and pi K atoms
Original language description
The DIRAC spectrometer installed at CERN PS was upgraded in order to study simultaneously A(2 pi) and A(pi K) atoms, namely the bound states of two pi mesons, and of pi and K mesons, respectively. The detector system can now accept a high intensity beam of 2-6 x 10(11) primary protons per second. The electronics and the data-acquisition system can handle a very large amount of data to identify pi, K, p, e and mu, allowing the selection of pi pi and pi K pairs in the offline analysis. The resolution of the longitudinal and transverse components of the relative momentum Q of each meson pair in their center-of-mass system with respect to the direction of the pair was substantially improved. The analysis of their distributions allowed an reliable separation between the meson pairs originating from hadronic atoms and the backgrounds permitting the measurement of the lifetimes of hadronic atoms in the ground state and pi-pi, pi-K s-wave scattering lengths. The upgraded setup also allowed the study of the long-lived excited states of pi pi atoms.
Czech name
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Czech description
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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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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical
Nuclear Instruments & Methods in Physics Research Section A
ISSN
0168-9002
e-ISSN
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Volume of the periodical
839
Issue of the periodical within the volume
DEC
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
34
Pages from-to
52-85
UT code for WoS article
000386777600008
EID of the result in the Scopus database
2-s2.0-84988867535

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