Measurement of eta(c) (1S), eta(c)(2S), and nonresonant eta 'pi(+)pi(-) production via two-photon collisions

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10387026" target="_blank" >RIV/00216208:11320/18:10387026 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/PhysRevD.98.072001" target="_blank" >https://doi.org/10.1103/PhysRevD.98.072001</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.98.072001" target="_blank" >10.1103/PhysRevD.98.072001</a>

Result language
angličtina
Original language name
Measurement of eta(c) (1S), eta(c)(2S), and nonresonant eta 'pi(+)pi(-) production via two-photon collisions
Original language description
We report the measurement of gamma gamma -> eta(c) (1S) -> eta(c) (2S) -> eta'pi(+)pi(-) with eta' decays to gamma rho and eta pi(+)pi(-) using 941 fb(-1) of data collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The eta(c) (1S) mass and width are measured to be M = [2984.6 +/- 0.7 (sta) +/- 2.2 (syst) +/- 0.3 (model)] MeV/c(2) and Gamma = [30.8(-2.2)(+2.3) (stat) +/- 2.5 (syst) +/- 1.4 (model)] MeV, respectively. First observation of eta(c) (2S) -> eta'pi(+)pi(-) with a significance of 5.5 sigma including systematic error is obtained, and the eta(c) (2S)mass is measured to be M = [3635.1 +/- 3.7 (stat) +/- 2.9 (syst) +/- 0.4 (model)] MeV/c(2). The products of the two-photon decay width and branching fraction (B) of decays to eta'pi(+)pi(-) are determined to be Gamma(gamma gamma)Gamma B-gamma gamma = [65.4 +/- 2.6 (stat) +/- 7.8 (syst)] eV for eta(c)(1S) and [5.6(-1.1)(+1.2) (stat) +/- 1.1 (syst)] eV for eta(c) (2S). The cross sections for gamma gamma -> eta'pi(+)pi(-) and eta'f(2)(1270) are measured for the first time.
Czech name
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Czech description
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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
10303 - Particles and field physics

Project
<a href="/en/project/LTT17020" target="_blank" >LTT17020: Study of Beyond Standard Model Physics with the International Experiment Belle II in Japan</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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