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論文

Measurement of the branching fraction of $$Lambda_c^+ to p omega$$ decay at Belle

Li, S. X.*; 谷田 聖; Belle Collaboration*; 他193名*

Physical Review D, 104(7), p.072008_1 - 072008_8, 2021/10

https://doi.org/10.1103/PhysRevD.104.072008
 被引用回数：3 パーセンタイル：29.55(Astronomy & Astrophysics)

Using 980.6 $$rm fb^{-1}$$ of data collected with the Belle detector operating at the KEKB asymmetric-energy $$e^+e^-$$ collider, we present a measurement of the branching fraction of the singly Cabibbo-suppressed decay $$Lambda_c^+ to p omega$$. A clear $$Lambda_c^+$$ signal is observed for $$Lambda_c^+ to p omega$$ with a statistical significance of 9.1 standard deviations, and we measure the ratio of branching fractions $${cal B}(Lambda_c^+ to p omega)/{cal B}(Lambda_c^+ to p K^- pi^+) = (1.32 pm 0.12 (rm stat) pm 0.10 (rm syst))times 10^{-2}$$, from which we infer the branching fraction $${cal B}(Lambda_c^+ to p omega) = (8.27 pm 0.75 (rm stat) pm 0.62 (rm syst) pm 0.42 (rm ref))times 10^{-4}$$. The first quoted uncertainty is statistical, the second systematic, and the third from the reference mode $$Lambda_c^+ to p K^- pi^+$$.

論文

Measurement of the resonant and nonresonant branching ratios in $$Xi_{c}^{0} rightarrow Xi^{0} K^+ K^-$$

McNeil, J. T.*; 谷田 聖; Belle Collaboration*; 他193名*

Physical Review D, 103(11), p.112002_1 - 112002_11, 2021/06

https://doi.org/10.1103/PhysRevD.103.112002
 被引用回数：2 パーセンタイル：20.63(Astronomy & Astrophysics)

Using the entire data sample of $$980$$ $$rm fb^{-1}$$ integrated luminosity collected with the Belle detector at the KEKB asymmetric-energy $$e^{+}e^{-}$$ collider, we present an amplitude analysis measuring the branching fractions of the Cabibbo-allowed, $$W$$-exchange resonant decay $$Xi_{c}^{0} rightarrow Xi^{0} phi (to K^+ K^-)$$ with a polarized $$phi$$ and the non-resonant decay via a direct process $$Xi_{c}^{0} rightarrow Xi^{0} K^+ K^-$$. We present these measurements, relative to the normalization mode $$Xi^{-}pi^{+}$$, and find branching ratios $$frac{mathcal{B}(Xi_{c}^{0} rightarrow Xi^{0} phi (rightarrow K^{+}K^{-}))}{mathcal{B}(Xi_{c}^{0} rightarrow Xi^{-} pi^{+})}$$ = $${rm 0.036 pm 0.004 (stat.) pm 0.002 (syst.)}$$ and $$frac{mathcal{B}(Xi_{c}^{0} rightarrow Xi^{0} K^{+} K^{-})}{mathcal{B}(Xi_{c}^{0} rightarrow Xi^{-} pi^{+})}$$ = $$ 0.039 pm 0.004 ({rm stat.}) pm 0.002 {rm (syst.)}$$ which suggest that only minor cusping peaks occur in the combinatorial background of $$Omega^{*-} to Xi^{0}K^{-}$$ due to these $$Xi_{c}^{0}$$ decays.

論文

Search for $$Omega(2012)to KXi(1530) to KpiXi$$ at Belle

Jia, S.*; 谷田 聖; Belle Collaboration*; 他193名*

Physical Review D, 100(3), p.032006_1 - 032006_11, 2019/08

https://doi.org/10.1103/PhysRevD.100.032006
 被引用回数：20 パーセンタイル：74.3(Astronomy & Astrophysics)

Using data samples of $$e^+e^-$$ collisions collected at the $$Upsilon(1S)$$, $$Upsilon(2S)$$, and $$Upsilon(3S)$$ resonances with the Belle detector, we search for the three-body decay of the $$Omega(2012)$$ baryon to $$KpiXi$$. This decay is predicted to dominate for models describing the $$Omega(2012)$$ as a $$KXi(1530)$$ molecule. No significant $$Omega(2012)$$ signals are observed in the studied channels, and 90% credibility level upper limits on the ratios of the branching fractions relative to $$K Xi$$ decay modes are obtained.

論文

Search for light tetraquark states in $$Upsilon(1S)$$ and $$Upsilon(2S)$$ decays

Jia, S.*; 谷田 聖; Belle Collaboration*; 他193名*

Physical Review D, 96(11), p.112002_1 - 112002_14, 2017/12

AA2018-0579.pdf:1.79MB

https://doi.org/10.1103/PhysRevD.96.112002
 被引用回数：2 パーセンタイル：13.72(Astronomy & Astrophysics)

We search for the $$J^{PC}=0^{--}$$ and $$1^{+-}$$ light tetraquark states with masses up to 2.46~GeV/$$c^2$$ in $$Upsilon(1S)$$ and $$Upsilon(2S)$$ decays with data samples of $$(102pm 2)$$ million and $$(158pm 4)$$ million events, respectively, collected with the Belle detector. No significant signals are observed in any of the studied production modes, and 90% credibility level (C.L.) upper limits on their branching fractions in $$Upsilon(1S)$$ and $$Upsilon(2S)$$ decays are obtained. The inclusive branching fractions of the $$Upsilon(1S)$$ and $$Upsilon(2S)$$ decays into final states with $$f_1(1285)$$ are measured to be $${cal B}(Upsilon(1S)to f_1(1285)+anything)=(46pm28({rm stat.})pm13({rm syst.}))times 10^{-4}$$ and $${cal B}(Upsilon(2S)to f_1(1285)+anything)=(22pm15({rm stat.})pm6.3({rm syst.}))times 10^{-4}$$. The measured $$chi_{b2} to J/psi + anything$$ branching fraction is measured to be $$(1.50pm0.34({rm stat.})pm0.22({rm syst.}))times 10^{-3}$$, and 90% C.L. upper limits for the $$chi_{b0,b1} to J/psi + anything$$ branching fractions are found to be $$2.3times 10^{-3}$$ and $$1.1times 10^{-3}$$, respectively. For $${cal B}(chi_{b1} to omega + anything)$$, the branching fraction is measured to be $$(4.9pm1.3({rm stat.})pm0.6({rm syst.}))times 10^{-2}$$. All results reported here are the first measurements for these modes.

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