Study of charmonium resonances in the γγ -> K⁰_SK^± π^∓i- and γγ -> K⁺ K^-π⁺π^-π⁰ processes

Thesis/Dissertation · Sat Jan 01 00:00:00 EST 2011

DOI:https://doi.org/10.2172/1035490· OSTI ID:1035490

Biassoni, Pietro ^[1]

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1. Univ. of Milan (Italy)

This thesis reports the analysis of the e⁺e^- → e⁺e^-K_S⁰K^±π^± and e⁺e^- → e⁺e^-K⁺K^-π⁺π^-π⁰ processes using the final dataset of the BABAR experiment located at the SLAC National Accelerator Laboratory. From previous measurements, the K_S⁰K^±π^± final state is known to show a clear signal from the β_c(2S) particle. This c$$\bar{c}$$ state escaped detection for almost twenty years and its properties are still not well established on the experimental ground, while accurate predictions exist on the theoretical side. The e⁺e^-→ e⁺e^-K⁺K^-π⁺π^-π⁰ process is first studied in this thesis. An accurate determination of the β_c(2S) properties is obtained in the K_S⁰K^±π^± decay mode. We also report the first observation of η_c(2S) and other charmonium states to the K⁺K^-π⁺π^-π⁰ final state. The results of this thesis have been published in Physical Review D, and will be useful to test theoretical models describing the charmonium system. The thesis is organized in four chapters. The first one gives a brief introduction of the theoretical models used to describe the charmonium system. The second one discuss the current status of conventional and exotic charmonium spectroscopy, reporting recent experimental results and their interpretation. The third Chapter is devoted to describe the BABAR experiment. The analysis technique and results are described in Chapter 4. Finally, conclusions from this analysis are drawn.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 1035490
• Report Number(s): SLAC-R-983; TRN: US1201226
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
CHARMONIUM
DECAY
DETECTION
FERMILAB ACCELERATOR
SPECTROSCOPY
STANFORD LINEAR ACCELERATOR CENTER
Experiment-HEP
HEPEX