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論文

Measurement of the masses and widths of the $$Sigma_c(2455)^+$$ and $$Sigma_c(2520)^+$$ baryons

Yelton, J.*; 谷田 聖; Belle Collaboration*; 他205名*

Physical Review D, 104(5), p.052003_1 - 052003_8, 2021/09

https://doi.org/10.1103/PhysRevD.104.052003
 被引用回数：7 パーセンタイル：43.47(Astronomy & Astrophysics)

Using 980 $${rm fb}^{-1}$$ of data ${collected}$ with the Belle detector operating at the KEKB asymmetric-energy $$e^+e^-$$ collider, we report the measurements of the masses, and the first measurements of the instrinsic widths, of the $$Sigma_c(2455)^+$$ and $$Sigma_c(2520)^+$$ charmed baryons. We find $$M(Sigma_c(2455)^+)-M(Lambda_c^+) = 166.17pm 0.05^{+0.16}_{-0.07} {rm MeV}/c^2$$, $$Gamma(Sigma_c(2455)^+) = 2.3 pm 0.3 pm 0.3 {rm MeV/c^2}$$, $$M(Sigma_c(2520)^+)-M(Lambda_c^+) = 230.9 pm 0.5 ^{+0.5}_{-0.1} {rm MeV}/c^2$$, and $$Gamma(Sigma_c(2520)^+) = 17.2^{+2.3 +3.1}_{-2.1 -0.7} {rm MeV}/c^2$$, where the uncertainties are statistical and systematic, respectively. These measurements can be used to test models of the underlying quark structure of the $$Sigma_c$$ states.

論文

Study of electromagnetic decays of orbitally excited $$Xi_c$$ Baryons

Yelton, J.*; 谷田 聖; Belle Collaboration*; 他208名*

Physical Review D, 102(7), p.071103_1 - 071103_8, 2020/10

https://doi.org/10.1103/PhysRevD.102.071103
 被引用回数：14 パーセンタイル：61.64(Astronomy & Astrophysics)

Using 980 fb$$^{-1}$$ of data collected with the Belle detector operating at the KEKB asymmetric-energy $$e^+e^-$$ collider, we report a study of the electromagnetic decays of excited ${charmed baryons}$ $$Xi_c(2790)$$ and $$Xi_c(2815)$$. A clear signal (8.6 standard deviations) is observed for $$Xi_c(2815)^0 to Xi_c^0gamma$$, and we measure: $$B[Xi_c(2815)^0 to Xi_c^0gamma]/B[Xi_c(2815)^0 to Xi_c(2645)^+pi^- to Xi_c^0pi^+pi^-] = 0.41 pm 0.05 pm 0.03$$. We also present evidence (3.8 standard deviations) for the similar decay of the $$Xi_c(2790)^0$$ and measure: $$B[Xi_c(2790)^{0}toXi_c^{0}gamma]/B[Xi_c(2790)^0toXi_c^{prime +}pi^{-}toXi_c^{+}gamma pi^-] = 0.13 pm 0.03 pm 0.02$$. The first quoted uncertainties are statistical and the second systematic. We find no hint of the analogous decays of the $$Xi_c(2815)^+$$ and $$Xi_c(2790)^+$$ baryons and set upper limits at the 90% confidence level of: $$B[Xi_c(2815)^{+}toXi_c^{+}gamma]/B[Xi_c(2815)^+toXi_c(2645)^0pi^+toXi_c^+pi^-pi^+] < 0.09,$$ and $$B[Xi_c(2790)^{+}toXi_c^{+}gamma]/B[Xi_c(2790)^+toXi_c^{prime0}pi^{+}toXi_c^{0}gamma pi^+] < 0.06.$$ Approximate values of the partial widths of the decays are extracted, which can be used to discriminate between models of the underlying quark structure of these excited states.

論文

Observation of an excited $$Omega^-$$ Baryon

Yelton, J.*; 谷田 聖; Belle Collaboration*; 他190名*

Physical Review Letters, 121(5), p.052003_1 - 052003_7, 2018/08

AA2018-0593.pdf:0.37MB

https://doi.org/10.1103/PhysRevLett.121.052003
 被引用回数：42 パーセンタイル：87.12(Physics, Multidisciplinary)

Using data recorded with the Belle detector, we observe a new excited hyperon, an $$Omega^{*-}$$ candidate decaying into $$Xi^0K^-$$ and $$Xi^-K^0_S$$ with a mass of $$2012.4pm0.7 {rm (stat)pm 0.6 (rm syst)} {rm MeV}/c^2$$ and a width of $$Gamma=6.4^{+2.5}_{-2.0} {rm(stat)}pm1.6 {rm(syst)} {rm MeV}$$. The $$Omega^{*-}$$ is seen primarily in $$Upsilon(1S), Upsilon(2S)$$, and $$Upsilon(3S)$$ decays.

論文

Observation of excited $$Omega_c$$ charmed baryons in $$e^+e^-$$ collisions

Yelton, J.*; 谷田 聖; Belle Collaboration*; 他177名*

Physical Review D, 97(5), p.051102_1 - 051102_6, 2018/03

AA2018-0513.pdf:0.37MB

https://doi.org/10.1103/PhysRevD.97.051102
 被引用回数：82 パーセンタイル：95.34(Astronomy & Astrophysics)

Using the entire Belle data sample of 980 $${rm fb}^{-1}$$ of $$e^+e^-$$ collisions, we present the results of a study of excited $$Omega_c$$ charmed baryons in the decay mode $$Xi_c^+K^-$$. We show confirmation of four of the five narrow states reported by the LHCb Collaboration: the $$Omega_c(3000)$$, $$Omega_c(3050)$$, $$Omega_c(3066)$$, and $$Omega_c(3090)$$.

論文

Measurement of branching fractions of hadronic decays of the $$Omega_c^0$$ baryon

Yelton, J.*; 谷田 聖; Belle Collaboration*; 他187名*

Physical Review D, 97(3), p.032001_1 - 032001_8, 2018/02

AA2018-0512.pdf:0.46MB

https://doi.org/10.1103/PhysRevD.97.032001
 被引用回数：13 パーセンタイル：51.76(Astronomy & Astrophysics)

Using a data sample of 980 $${rm fb}^{-1}$$ of $$e^+e^-$$ annihilation data taken with the Belle detector operating at the KEKB asymmetric-energy $$e^+e^-$$ collider, we report the results of a study of the decays of the $$Omega_c^0$$ charmed baryon into hadronic final states. We report the most precise measurements to date of the relative branching fractions of the $$Omega_c^0$$ into $$Omega^-pi^+pi^0$$, $$Omega^-pi^+pi^-pi^+$$, $$Xi^-K^-pi^+pi^+$$, and $$Xi^0K^-pi^+$$, as well as the first measurements of the branching fractions of the $$Omega_c^0$$ into $$Xi^-bar{K}^0pi^+$$, $$Xi^0bar{K}^0$$, and $$Lambda bar{K}^0bar{K}^0$$, all with respect to the $$Omega^-pi^+$$ decay. In addition, we investigate the resonant substructure of these modes. Finally, we present a limit on the branching fraction for the decay $$Omega_c^0toSigma^+K^-K^-pi^+$$.

論文

Study of excited $$Xi_c$$ states decaying into $$Xi_c^0$$ and $$Xi_c^+$$ baryons

Yelton, J.*; 谷田 聖; Belle Collaboration*; 他155名*

Physical Review D, 94(5), p.052011_1 - 052011_14, 2016/09

AA2016-0394.pdf:0.69MB

https://doi.org/10.1103/PhysRevD.94.052011
 被引用回数：62 パーセンタイル：91.09(Astronomy & Astrophysics)

Using a data sample of 980 fb$$^{-1}$$ of $$e^+e^-$$ annihilation data taken with the Belle detector operating at the KEKB asymmetric-energy $$e^+e^-$$ collider, we report the results of a study of excited $$Xi_c$$ states that decay, via the emission of photons and/or charged pions, into $$Xi_c^0$$ or $$Xi_c^+$$ ground state charmed-strange baryons. We present new measurements of the masses of all members of the $$Xi_c'$$, $$Xi_c(2645)$$, $$Xi_c(2790)$$, $$Xi_c(2815)$$, $$Xi_c(2980)$$ isodoublets, measurements of the intrinsic widths of those that decay strongly, and evidence of previously unknown transitions.

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