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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/61389005:_____/16:00466587 RIV/68407700:21340/16:00309014

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BF - Elementární částice a fyzika vysokých energií

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Nuclear Instruments & Methods in Physics Research Section A

ISSN

0168-9002

e-ISSN

—

Svazek periodika

839

Číslo periodika v rámci svazku

DEC

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

34

Strana od-do

52-85

Kód UT WoS článku

000386777600008

EID výsledku v databázi Scopus

2-s2.0-84988867535