STUDY OF CHARMONIUM RESONANCES IN THE GAMGAM -> K0S K+PI- AND GAMGAM -> K+K-PI+PI-PI0 PROCESSES
Tesi di Dottorato
Data di Pubblicazione:
2012
Citazione:
STUDY OF CHARMONIUM RESONANCES IN THE GAMGAM -> K0S K+PI- AND GAMGAM -> K+K-PI+PI-PI0 PROCESSES / P. Biassoni ; tutor: F. Palombo ; coordinatore: M. Bersanelli. Universita' degli Studi di Milano, 2012 Feb 17. 24. ciclo, Anno Accademico 2011. [10.13130/biassoni-pietro_phd2012-02-17].
Abstract:
We study charmonium resonances produced via two-photon interactions and decaying to the K0S K+ PI- and K+ K- PI+ PI- PI0 final states, using data collected by the BaBar experiment, located at the PEP-II asymmetric e+e- storage ring at SLAC National Accelerator Laboratory.
We observe the eta_c(1S), chi_c0(1P) and
eta_c(2S) resonances produced in two-photon interactions and
decaying to K+ K- PI+ PI- PI0, with significances of 18.1, 5.4 and
5.3 standard deviations (including
systematic errors), respectively, and report 4.0sigma evidence of
the chi_c2(1P) decay to this final state.
We measure the eta_c(2S)mass and width in K0S K+ PI- decays, and
obtain the values m(eta_c(2S))= 3638.5 +/- 1.5 +/- 0.8 MeV/c^2 and
Gamma(eta_c(2S)) = 13.4 +/- 4.6 +/- 3.2 MeV, where
the first uncertainty is statistical and the second is systematic.
We measure the two-photon width times branching
fraction for the reported resonance signals, and search for
the chi_c2(2P) resonance, but no significant signal
is observed.
Tipologia IRIS:
Tesi di dottorato
Keywords:
charmonium ; two-photon collisions ; BaBar
Elenco autori:
P. Biassoni
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