Evidence of a new excited charmed baryon decaying to $Sigma_{c}(2455)^{0,++} pi^{pm}$

Li, Y. B.*; 谷田聖 ; Belle Collaboration*; 他194名*

Li, Y. B.*; Tanida, Kiyoshi; Belle Collaboration*; 194 of others*

We present the study of $bar{B}^{0} to Sigma_{c}(2455)^{0,++} pi^{pm} bar{p}$ decays based on $772times 10^{6}$ events collected with the Belle detector at the KEKB asymmetric-energy collider. The $Sigma_{c}(2455)^{0,++}$ candidates are reconstructed via their decay to $Lambda_{c}^{+} pi^{mp}$ and $Lambda_{c}^{+}$ decays to $pK^{-}pi^{+},~pK_{S}^{0},$ and $Lambdapi^{+}$ final states. The corresponding branching fractions are measured to be ${cal B}(bar{B}^{0} to Sigma_{c}(2455)^{0} pi^{+} bar{p}) = (1.09 pm 0.06 pm 0.07)times10^{-4}$ and ${cal B}(bar{B}^{0} to Sigma_{c}(2455)^{++} pi^{-} bar{p}) = (1.84pm 0.11 pm 0.12)times 10^{-4}$ , which are consistent with the world average values with improved precision. A new structure is found in the $M_{Sigma_{c}(2455)^{0,++}pi^{pm}}$ spectrum with a significance of including systematic uncertainty. The structure is possibly an excited $Lambda_{c}^{+}$ and is tentatively named $Lambda_{c}(2910)^{+}$ . Its mass and width are measured to be MeV/ $c^{2}$ and MeV, respectively. The products of branching fractions for the $Lambda_{c}(2910)^{+}$ are measured to be ${cal B}(bar{B}^{0} to Lambda_{c}(2910)^{+}bar{p})times{cal B}(Lambda_{c}(2910)^{+} to Sigma_{c}(2455)^{0}pi^{+}) = (9.5 pm 3.6 pm 1.6)times 10^{-6}$ and ${cal B}(bar{B}^{0} to Lambda_{c} (2910)^{+}bar{p})times {cal B}(Lambda_{c}(2910)^{+} to Sigma_{c}(2455)^{++}pi^{-}) = (1.24 pm 0.35 pm 0.10)times 10^{-5}$ . Here, the first and second uncertainties are statistical and systematic, respectively.

使用言語	:	English
掲載資料名	:	Physical Review Letters
巻	:	130
号	:	3
ページ数	:	p.031901_1 - 031901_7
発行年月	:	2023/01
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論文URL	:	https://doi.org/10.1103/PhysRevLett.130.031901
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登録番号 : AA20240811
抄録集掲載番号 : 53000334
論文投稿番号 : 29127

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