Study of gamma gamma -> gamma psi(2S) at Belle
The result's identifiers
Result code in 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>
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
Study of gamma gamma -> gamma psi(2S) at Belle
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2022
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 D
ISSN
2470-0010
e-ISSN
2470-0029
Volume of the periodical
105
Issue of the periodical within the volume
11
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
112011
UT code for WoS article
000822568800003
EID of the result in the Scopus database
2-s2.0-85134206730