Measurement of the {eta}-Meson Mass Using {psi}(2S){yields}{eta}J/{psi}

Journal Article · Fri Sep 21 04:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.122002· OSTI ID:21024171

Miller, D H; Sanghi, B; Shipsey, I P. J.; Xin, B ^[1]; Adams, G S; Anderson, M; Cummings, J P; Danko, I; Ge, J Y; Hu, D; Moziak, B; Napolitano, J ^[2]; He, Q; Insler, J; Muramatsu, H; Park, C S; Thorndike, E H; Yang, F ^[3]; Artuso, M; Blusk, S ^[4]

---

1. Purdue University, West Lafayette, Indiana 47907 (United States)
2. Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)
3. University of Rochester, Rochester, New York 14627 (United States)
4. Syracuse University, Syracuse, New York 13244 (United States)

We measure the mass of the {eta} meson using {psi}(2S){yields}{eta}J/{psi} events acquired with the CLEO-c detector operating at the CESR e{sup +}e{sup -} collider. Using the four decay modes {eta}{yields}{gamma}{gamma}, 3{pi}{sup 0}, {pi}{sup +}{pi}{sup -}{pi}{sup 0}, and {pi}{sup +}{pi}{sup -}{gamma}, we find M{sub {eta}}=547.785{+-}0.017{+-}0.057 MeV, in which the first uncertainty is statistical and the second systematic. This result has an uncertainty comparable to the two most precise previous measurements and is consistent with that of NA48, but is inconsistent at the level of 6.5{sigma} with the much smaller mass obtained by GEM.

• OSTI ID: 21024171
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 99; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
CESR STORAGE RING
ETA MESONS
GAMMA RADIATION
J PSI-3097 MESONS
MASS
MEV RANGE 100-1000
MULTIPARTICLE SPECTROMETERS
PARTICLE DECAY
PARTICLE IDENTIFICATION
PHOTONS
PIONS MINUS
PIONS NEUTRAL
PIONS PLUS