AI Article Synopsis
- The study reports the first observation of the decay transition ϒ(4S)→ηh(b)(1P) using a large sample of decays from the Belle experiment, providing a branching fraction of (2.18±0.11±0.18)×10(-3).
- It measures the mass of the h(b)(1P) particle as (9899.3±0.4±1.0) MeV/c² and calculates the hyperfine splitting for h(b)(1P) to be (0.6±0.4±1.0) MeV/c².
- Additionally, the decay h(b)(1P)→γη(b)(1S) is analyzed
Article Abstract
Using a sample of 771.6×10(6) ϒϒ(4S) decays collected by the Belle experiment at the KEKB e(+)e(-) collider, we observe, for the first time, the transition ϒ(4S)→ηh(b)(1P) with the branching fraction B[ϒ(4S)→ηh(b)(1P)]=(2.18±0.11±0.18)×10(-3) and we measure the h(b)(1P) mass M(h(b)(1P))=(9899.3±0.4±1.0) MeV/c(2), corresponding to the hyperfine (HF) splitting ΔM(HF)(1P)=(0.6±0.4±1.0) MeV/c(2). Using the transition h(b)(1P)→γη(b)(1S), we measure the η(b)(1S) mass M(η(b)(1S))=(9400.7±1.7±1.6) MeV/c(2), corresponding to ΔM(HF)(1S)=(59.6±1.7±1.6) MeV/c(2), the η(b)(1S) width Γ(η(b)(1S))=(8(-5)(+6)±5) MeV/c(2) and the branching fraction B[h(b)(1P)→γη(b)(1S)]=(56±8±4)%.
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| http://dx.doi.org/10.1103/PhysRevLett.115.142001 | DOI Listing |
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