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First Observation of the Hadronic Transition Upsilon(4S) -˃ eta h(b)(1P) and New Measurement of the h(b)(1P) and eta(b)(1S) Parameters

Title
First Observation of the Hadronic Transition Upsilon(4S) -˃ eta h(b)(1P) and New Measurement of the h(b)(1P) and eta(b)(1S) Parameters
Author
천병구
Keywords
SHORT-DISTANCE ANALYSIS; HEAVY-QUARK SYSTEMS; SPECTROSCOPY; CHARMONIUM; STATES; QCD
Issue Date
2015-09
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v. 115, NO 14, Page. 142001-142001
Abstract
Using a sample of 771.6 x 10(6) Upsilon Upsilon(4S) decays collected by the Belle experiment at the KEKB e(+)e(-) collider, we observe, for the first time, the transition Upsilon(4S) -˃ eta h(b)(1P) with the branching fraction B[Upsilon(4S) -˃ eta h(b)(1P)] = (2.18 +/- 0.11 +/- 0.18) x 10(-3) and we measure the h(b)(1P) mass M-hb(1P) = (9899.3 +/- 0.4 +/- 1.0) MeV/c(2), corresponding to the hyperfine (HF) splitting Delta M-HF(1P) = (0.6 +/- 0.4 +/- 1.0) MeV/c(2). Using the transition h(b)(1P) -˃ gamma eta(b)(1S), we measure the eta(b)(1S) mass M-eta b(1S) = (9400.7 +/- 1.7 +/- 1.6) MeV/c(2), corresponding to Delta M-HF(1S) = (59.6 +/- 1.7 +/- 1.6) MeV/c(2), the eta(b)(1S) width Gamma(eta b)(1S) = (8(-5)(+6)+/- 5) MeV/c(2) and the branching fraction B[h(b)(1P) -˃ gamma eta(b)(1S)] = (56 +/- 8 +/- 4)%.
URI
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.115.142001http://hdl.handle.net/20.500.11754/27376
ISSN
0031-9007; 1079-7114
DOI
10.1103/PhysRevLett.115.142001
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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