Publication Date:
2021-06-01
Description:
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 $$ {Xi}_c^0o Lambda {overline{K}}^{ast 0} $$ Ξ c 0 → Λ K ¯ ∗ 0 , $$ {Xi}_c^0o {Sigma}^0{overline{K}}^{ast 0} $$ Ξ c 0 → Σ 0 K ¯ ∗ 0 , and $$ {Xi}_c^0o {Sigma}^{+}{K}^{ast -} $$ Ξ c 0 → Σ + K ∗ − for the first time. The relative branching ratios to the normalization mode of $$ {Xi}_c^0o {Xi}^{-}{pi}^{+} $$ Ξ c 0 → Ξ − π + are measured to be$$ {displaystyle egin{array}{c}mathcal{B}left({Xi}_c^0o Lambda {overline{K}}^{ast 0}
ight)/mathcal{B}left({Xi}_c^0o {Xi}^{-}{pi}^{+}
ight)=0.18pm 0.02left(mathrm{stat}.
ight)pm 0.01left(mathrm{syst}.
ight), {}mathcal{B}left({Xi}_c^0o {Sigma}^0{overline{K}}^{ast 0}
ight)/mathcal{B}left({Xi}_c^0o {Xi}^{-}{pi}^{+}
ight)=0.69pm 0.03left(mathrm{stat}.
ight)pm 0.03left(mathrm{syst}.
ight), {}mathcal{B}left({Xi}_c^0o {Sigma}^{+}{K}^{ast -}
ight)/mathcal{B}left({Xi}_c^0o {Xi}^{-}{pi}^{+}
ight)=0.34pm 0.06left(mathrm{stat}.
ight)pm 0.02left(mathrm{syst}.
ight),end{array}} $$ B Ξ c 0 → Λ K ¯ ∗ 0 / B Ξ c 0 → Ξ − π + = 0.18 ± 0.02 stat . ± 0.01 syst . , B Ξ c 0 → Σ 0 K ¯ ∗ 0 / B Ξ c 0 → Ξ − π + = 0.69 ± 0.03 stat . ± 0.03 syst . , B Ξ c 0 → Σ + K ∗ − / B Ξ c 0 → Ξ − π + = 0.34 ± 0.06 stat . ± 0.02 syst . , where the uncertainties are statistical and systematic, respectively. We obtain$$ {displaystyle egin{array}{c}mathcal{B}left({Xi}_c^0o Lambda {overline{K}}^{ast 0}
ight)=left(3.3pm 0.3left(mathrm{stat}.
ight)pm 0.2left(mathrm{syst}.
ight)pm 1.0left(mathrm{ref}.
ight)
ight)imes {10}^{-3}, {}mathcal{B}left({Xi}_c^0o {Sigma}^0{overline{K}}^{ast 0}
ight)=left(12.4pm 0.5left(mathrm{stat}.
ight)pm 0.5left(mathrm{syst}.
ight)pm 3.6left(mathrm{ref}.
ight)
ight)imes {10}^{-3}, {}mathcal{B}left({Xi}_c^0o {Sigma}^{+}{K}^{ast 0}
ight)=left(6.1pm 1.0left(mathrm{stat}.
ight)pm 0.4left(mathrm{syst}.
ight)pm 1.8left(mathrm{ref}.
ight)
ight)imes {10}^{-3},end{array}} $$ B Ξ c 0 → Λ K ¯ ∗ 0 = 3.3 ± 0.3 stat . ± 0.2 syst . ± 1.0 ref . × 10 − 3 , B Ξ c 0 → Σ 0 K ¯ ∗ 0 = 12.4 ± 0.5 stat . ± 0.5 syst . ± 3.6 ref . × 10 − 3 , B Ξ c 0 → Σ + K ∗ 0 = 6.1 ± 1.0 stat . ± 0.4 syst . ± 1.8 ref . × 10 − 3 , where the uncertainties are statistical, systematic, and from $$ mathcal{B}left({Xi}_c^0o {Xi}^{-}{pi}^{+}
ight) $$ B Ξ c 0 → Ξ − π + , respectively. The asymmetry parameters $$ alpha left({Xi}_c^0o Lambda {overline{K}}^{ast 0}
ight) $$ α Ξ c 0 → Λ K ¯ ∗ 0 and $$ alpha left({Xi}_c^0o {Sigma}^{+}{K}^{ast -}
ight) $$ α Ξ c 0 → Σ + K ∗ − are 0.15 ± 0.22(stat.) ± 0.04(syst.) and −0.52 ± 0.30(stat.) ± 0.02(syst.), respectively, where the uncertainties are statistical followed by systematic.
Print ISSN:
1126-6708
Electronic ISSN:
1029-8479
Topics:
Physics
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