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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：4 パーセンタイル：37.94(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

Search for a doubly charged $$DDK$$ bound state in $$Upsilon(1S, 2S)$$ inclusive decays and via direct production in $$e^+e^-$$ collisions at $$sqrt{s}$$ = 10.520, 10.580, and 10.867 GeV

Li, Y.*; 谷田 聖; Belle Collaboration*; 他205名*

Physical Review D, 102(11), p.112001_1 - 112001_14, 2020/12

https://doi.org/10.1103/PhysRevD.102.112001
 被引用回数：5 パーセンタイル：36.79(Astronomy & Astrophysics)

We report the results of a first search for a doubly-charged $$DDK$$ bound state, denoted the $$R^{++}$$, in $$Upsilon(1S)$$ and $$Upsilon(2S)$$ inclusive decays and via direct production in $$e^+e^-$$ collisions at $$sqrt{s}$$ = 10.520, 10.580, and 10.867 GeV. The search uses data accumulated with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider. No significant signals are observed in the $$D^{+}D_{s}^{*+}$$ invariant-mass spectra of all studied modes. The 90% credibility level upper limits on their product branching fractions in $$Upsilon(1S)$$ and $$Upsilon(2S)$$ inclusive decays ($${cal B}(Upsilon(1S,2S) to R^{++} + {rm anything}) times {cal B}(R^{++} to D^{+} D_{s}^{*+})$$), and the product values of Born cross section and branching fraction in $$e^+e^-$$ collisions ($$sigma(e^+e^- to R^{++} + {rm anything}) times {cal B}(R^{++} to D^{+} D_{s}^{*+})$$) at $$sqrt{s}$$ = 10.520, 10.580, and 10.867 GeV under different assumptions of $$R^{++}$$ masses varying from 4.13 to 4.17 GeV/$$c^2$$, and widths varying from 0 to 5 MeV are obtained.

論文

Observation of transverse $$Lambda/bar{Lambda}$$ hyperon polarization in $$e^+e^-$$ annihilation at Belle

Guan, Y.*; 谷田 聖; Belle Collaboration*; 他205名*

Physical Review Letters, 122(4), p.042001_1 - 042001_8, 2019/02

AA2019-0532.pdf:0.4MB

https://doi.org/10.1103/PhysRevLett.122.042001
 被引用回数：28 パーセンタイル：85.72(Physics, Multidisciplinary)

We report the first observation of the spontaneous polarization of $$Lambda$$ and $$bar{Lambda}$$ hyperons transverse to the production plane in $$e^+e^-$$ annihilation, which is attributed to the effect arising from a polarizing fragmentation function. For inclusive $$Lambda/bar{Lambda}$$ production, we also report results with subtracted feed-down contributions from $$Sigma^0$$ and charm. This measurement uses a dataset of 800.4 fb$$^{-1}$$ collected by the Belle experiment at or near a center-of-mass energy of 10.58 GeV. We observe a significant polarization that rises with the fractional energy carried by the $$Lambda/bar{Lambda}$$ hyperon.

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