Study of gamma gamma -> gamma psi(2S) at Belle
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10454503" target="_blank" >RIV/00216208:11320/22:10454503 - isvavai.cz</a>
Výsledek na webu
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=znRtA~GPEE" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=znRtA~GPEE</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.105.112011" target="_blank" >10.1103/PhysRevD.105.112011</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Study of gamma gamma -> gamma psi(2S) at Belle
Popis výsledku v původním jazyce
Using 980 fb(-1) of data at and around the Upsilon(nS) (n = 1, 2, 3, 4, 5) resonances collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider, the two-photon process gamma gamma -> gamma psi(2S) is studied from the threshold to 4.2 GeV for the first time. Two structures are seen in the invariant mass distribution of gamma psi(2S): one at M-R1 = 3922.4 +/- 6.5 +/- 2.0 MeV/c(2) with a width of Gamma(R1) = 22 +/- 17 +/- 4 MeV, and another at M-R2 = 4014.3 +/- 4.0 +/- 1.5 MeV/c(2) with a width of Gamma(R2) = 4 +/- 11 +/- 6 MeV; the signals are parametrized with the incoherent sum of two Breit-Wigner functions. The first structure is consistent with the X(3915) or the chi(c2)(3930), and the local statistical significance is determined to be 3.1 sigma with the systematic uncertainties included. The second matches none of the known charmonium or charmoniumlike states, and its global significance is determined to be 2.8 sigma including the look-elsewhere effect. The production rates are Gamma B-gamma gamma(R-1 -> gamma psi(2S)) = 9.8 +/- 3.6 +/- 1.3 eV assuming (J(PC), vertical bar lambda vertical bar) = (0(++), 0) or 2.0 +/- 0.7 +/- 0.2 eV with (2(++), 2) for the first structure and Gamma B-gamma gamma(R-2 -> gamma psi(2S)) = 6.2 +/- 2.2 +/- 0.8 eV with (0(++), 0) or 1.2 +/- 0.4 +/- 0.2 eV with (2(++), 2) for the second. Here, the first errors are statistical and the second systematic, and lambda is the helicity.
Název v anglickém jazyce
Study of gamma gamma -> gamma psi(2S) at Belle
Popis výsledku anglicky
Using 980 fb(-1) of data at and around the Upsilon(nS) (n = 1, 2, 3, 4, 5) resonances collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider, the two-photon process gamma gamma -> gamma psi(2S) is studied from the threshold to 4.2 GeV for the first time. Two structures are seen in the invariant mass distribution of gamma psi(2S): one at M-R1 = 3922.4 +/- 6.5 +/- 2.0 MeV/c(2) with a width of Gamma(R1) = 22 +/- 17 +/- 4 MeV, and another at M-R2 = 4014.3 +/- 4.0 +/- 1.5 MeV/c(2) with a width of Gamma(R2) = 4 +/- 11 +/- 6 MeV; the signals are parametrized with the incoherent sum of two Breit-Wigner functions. The first structure is consistent with the X(3915) or the chi(c2)(3930), and the local statistical significance is determined to be 3.1 sigma with the systematic uncertainties included. The second matches none of the known charmonium or charmoniumlike states, and its global significance is determined to be 2.8 sigma including the look-elsewhere effect. The production rates are Gamma B-gamma gamma(R-1 -> gamma psi(2S)) = 9.8 +/- 3.6 +/- 1.3 eV assuming (J(PC), vertical bar lambda vertical bar) = (0(++), 0) or 2.0 +/- 0.7 +/- 0.2 eV with (2(++), 2) for the first structure and Gamma B-gamma gamma(R-2 -> gamma psi(2S)) = 6.2 +/- 2.2 +/- 0.8 eV with (0(++), 0) or 1.2 +/- 0.4 +/- 0.2 eV with (2(++), 2) for the second. Here, the first errors are statistical and the second systematic, and lambda is the helicity.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10300 - Physical sciences
Návaznosti výsledku
Projekt
Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2022
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Physical Review D
ISSN
2470-0010
e-ISSN
2470-0029
Svazek periodika
105
Číslo periodika v rámci svazku
11
Stát vydavatele periodika
US - Spojené státy americké
Počet stran výsledku
11
Strana od-do
112011
Kód UT WoS článku
000822568800003
EID výsledku v databázi Scopus
2-s2.0-85134206730