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Studies of charmed strange baryons in the $$Lambda D$$ final state at Belle

Belle実験における$$Lambda D$$終状態に崩壊するチャームドストレンジバリオンの研究

加藤 悠司*; 谷田 聖   ; Belle Collaboration*; 他175名*

Kato, Yuji*; Tanida, Kiyoshi; Belle Collaboration*; 175 of others*

We report the discovery of $$Xi_c(3055)^0$$, observed by its decay into the final-state $$Lambda D^0$$, and present the first observation and evidence of the decays of $$Xi_c(3055)^+$$ and $$Xi_c(3080)^+$$ into $$Lambda D^+$$. We also perform a combined analysis of the $$Lambda D^+$$ with the $$Sigma_c^{++}K^-$$ and $$Sigma_c^{*++}K^-$$ decay modes to measure the ratios of branching fractions, masses and widths with improved accuracy. We measure the ratios of branching fractions $${cal B}(Xi_c(3055)^+ to Lambda D^+)/{cal B}(Xi_c(3055)^+ to Sigma_c^{++}K^- = 5.09 pm 1.01 pm 0.76$$, $${cal B}(Xi_c(3080)^+ to Lambda D^+)/{cal B}(Xi_c(3080)^+ to Sigma_c^{++}K^- = 1.29 pm 0.30 pm 0.15$$, and $${cal B}(Xi_c(3080)^+ to Sigma_c^{*++}K^-)/{cal B}(Xi_c(3080)^+ to Sigma_c^{++}K^- = 1.07 pm 0.27 pm 0.04$$, where the uncertainties are statistical and systematic. The analysis is performed using a 980 fb$$^{-1}$$ data sample collected with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider.

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パーセンタイル:85.59

分野:Astronomy & Astrophysics

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