Measurement of the mass and full width of the {eta}{sub c} meson

Journal Article · Sun Oct 01 04:00:00 EDT 2000 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.62.072001· OSTI ID:20217719

Bai, J Z ^[1]; Ban, Y ^[2]; Bian, J G ^[1]; Blum, I ^[3]; Chen, A D ^[1]; Chen, G P ^[1]; Chen, H F ^[4]; Chen, H S ^[1]; Chen, J ^[5]; Chen, J C ^[1]

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1. Institute of High Energy Physics, Beijing 100039, People's Republic of China (China)
2. Peking University, Beijing 100871, People's Republic of China (China)
3. University of Texas at Dallas, Richardson, Texas 75083-0688 (United States)
4. University of Science and Technology of China, Hefei 230026, People's Republic of China (China)
5. Colorado State University, Fort Collins, Colorado 80523 (United States)

In a sample of 7.8 million J/{psi} decays collected in the Beijing Spectrometer, the process J/{psi}{yields}{gamma}{eta}{sub c} is observed for five different {eta}{sub c} decay channels: K{sup +}K{sup -}{pi}{sup +}{pi}{sup -}, {pi}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -}, K{sup {+-}}K{sub S}{sup 0}{pi}{sup {+-}} (with K{sub S}{sup 0}{yields}{pi}{sup +}{pi}{sup -}), {phi}{phi} (with {phi}{yields}K{sup +}K{sup -}) and K{sup +}K{sup -}{pi}{sup 0}. From these signals, we determine the mass of {eta}{sub c} to be 2976.6{+-}2.9{+-}1.3 MeV. Combining this result with a previously reported result from a similar study using {psi}(2S){yields}{gamma}{eta}{sub c} detected in the same spectrometer gives m{sub {eta}{sub c}}=2976.3{+-}2.3{+-}1.2 MeV. For the combined samples, we obtain {gamma}{sub {eta}{sub c}}=11.0{+-}8.1{+-}4.1 MeV. (c) 2000 The American Physical Society.

• OSTI ID: 20217719
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 62; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHARM PARTICLES
CHARMONIUM
ETA MESONS
EXPERIMENTAL DATA
KAONS MINUS
KAONS NEUTRAL
KAONS PLUS
MASS
PIONS MINUS
PIONS PLUS
QUARK-ANTIQUARK INTERACTIONS