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論文

Measurements of branching fractions and asymmetry parameters of $$Xi^0_cto Lambdabar K^{*0}$$, $$Xi^0_cto Sigma^0bar K^{*0}$$, and $$Xi^0_cto Sigma^+K^{*-}$$ decays at Belle

Jia, S.*; 谷田 聖; Belle Collaboration*; 他186名*

Journal of High Energy Physics (Internet), 2021(6), p.160_1 - 160_13, 2021/06

https://doi.org/10.1007/JHEP06(2021)160
 被引用回数：4 パーセンタイル：37.94(Physics, Particles & Fields)

Using a data sample of 980 fb$$^{-1}$$ collected with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider, we study the processes of $$Xi^0_cto Lambdabar K^{*0}$$, $$Xi^0_cto Sigma^0bar K^{*0}$$, and $$Xi^0_cto Sigma^+K^{*-}$$ for the first time. The relative branching ratios to the normalization mode of $$Xi^0_c to Xi^- pi^+$$ are measured to be $${cal B}(Xi^0_cto Lambdabar K^{*0})/{cal B}(Xi_c^0 to Xi^-pi^+)=0.18 pm 0.02({rm stat.})pm0.01({rm syst.}),$$ $${cal B}(Xi^0_cto Sigma^0bar K^{*0})/{cal B}(Xi_c^0to Xi^-pi^+)=0.69pm0.03({rm stat.})pm0.03({rm syst.}),$$ $${cal B}(Xi^0_cto Sigma^+K^{*-})/{cal B}(Xi_c^0to Xi^-pi^+)=0.34pm0.06({rm stat.})pm0.02({rm syst.}),$$ where the uncertainties are statistical and systematic, respectively. We obtain the branching fractions of $$Xi^0_cto Lambdabar K^{*0}$$, $$Xi^0_cto Sigma^0bar K^{*0}$$, and $$Xi^0_cto Sigma^+K^{*-}$$ to be $${cal B}(Xi^0_cto Lambdabar K^{*0})=(3.3pm0.3({rm stat.})pm0.2({rm syst.})pm1.0({rm ref.}))times10^{-3},$$ $${cal B}(Xi^0_cto Sigma^0bar K^{*0})=(12.4pm0.5({rm stat.})pm0.5({rm syst.})pm3.6({rm ref.}))times10^{-3},$$ $${cal B}(Xi^0_cto Sigma^+K^{*-})=(6.1pm1.0({rm stat.})pm0.4({rm syst.})pm1.8({rm ref.}))times10^{-3},$$ where the uncertainties are statistical, systematic, and from $${cal B}(Xi_c^0 to Xi^-pi^+)$$, respectively. The asymmetry parameters $$alpha(Xi^0_cto Lambdabar K^{*0})$$ and $$alpha(Xi^0_cto Sigma^+K^{*-})$$ are $$0.15pm0.22({rm stat.})pm0.04({rm syst.})$$ and $$-0.52pm0.30({rm stat.})pm0.02({rm syst.})$$, respectively, where the uncertainties are statistical followed by systematic.

論文

Measurement of branching fraction and final-state asymmetry for the $$bar{B}^{0}to K^{0}_{S}K^{mp}pi^{pm}$$ decay

Lai, Y.-T.*; 谷田 聖; Belle Collaboration*; 他186名*

Physical Review D, 100(1), p.011101_1 - 011101_9, 2019/07

https://doi.org/10.1103/PhysRevD.100.011101
 被引用回数：1 パーセンタイル：7.79(Astronomy & Astrophysics)

We report a measurement of the branching fraction and final-state asymmetry for the $$bar{B}^{0}to K^{0}_{S}K^{mp}pi^{pm}$$ decays. The analysis is based on a data sample of 711 $$rm{fb}^{-1}$$ collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^{+}e^{-}$$ collider. We obtain a branching fraction of $$(3.60pm0.33pm0.15)times10^{-6}$$ and a final-state asymmetry of $$(-8.5pm8.9pm0.2)%$$, where the first uncertainties are statistical and the second are systematic. Hints of peaking structures are seen in the differential branching fractions measured as functions of Dalitz variables.

論文

Transverse momentum dependent production cross sections of charged pions, kaons and protons produced in inclusive $$e^+e^-$$ annihilation at $$sqrt{s}=$$ 10.58 GeV

Seidl, R.*; 谷田 聖; Belle Collaboration*; 他186名*

Physical Review D, 99(11), p.112006_1 - 112006_15, 2019/06

AA2019-0569.pdf:2.23MB

https://doi.org/10.1103/PhysRevD.99.112006
 被引用回数：15 パーセンタイル：63.3(Astronomy & Astrophysics)

We report measurements of the production cross sections of charged pions, kaons, and protons as a function of fractional energy, the event-shape variable called thrust, and the transverse momentum with respect to the thrust axis. These measurements access the transverse momenta created in the fragmentation process, which are of critical importance to the understanding of any transverse momentum dependent distribution and fragmentation functions. The low transverse momentum part of the cross sections can be well described by Gaussians in transverse momentum as is generally assumed but the fractional-energy dependence is non-trivial and different hadron types have varying Gaussian widths. The width of these Gaussians decreases with thrust and shows an initially rising, then decreasing fractional-energy dependence. The widths for pions and kaons are comparable within uncertainties, while those for protons are significantly narrower. These single-hadron cross sections and Gaussian widths are obtained from a $$558,{rm fb}^{-1}$$ data sample collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider.

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