English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We study the charmless decays B to Lambda Lambdabar h, where h stands forpi^+, K^+,K^0,K^{*+}, or K^{*0}, using a 605 fb^{-1} data sample collected atthe Upsilon(4S)resonance with the Belle detector at the KEKB asymmetric energye^+ e^- collider. We observe B0 to Lambda Lambdabar K0 and B0 to LambdaLambdabar K*0 with branching fractions of (4.76^{+0.84}_{-0.68} (stat.) \pm0.61 (syst.)) \times 10^{-6} and (2.46^{+0.87}_{-0.72} \pm 0.34) \times10^{-6}, respectively. The significances of these signals in the threshold-massenhanced mass region are 12.4 sigma and 9.3 sigma, respectively. We also updatethe branching fraction BF(B+ to Lambda Lambdabar K+) = (3.38^{+0.41}_{-0.36}\pm 0.41)\times 10^{-6} with better accuracy,and report the followingmeasurement or 90% confidence level upper limit in the threshold-mass-enhancedregion: BF(B+ to Lambda Lambdabar K*+) = (2.19^{+1.13}_{-0.89} \pm 0.33) \times10^{-6} with 3.7 sigma significance; BF(B+ to Lambda Lambdabar pi+) < 0.94\times 10^{-6}. A related search for B0 to Lambda Lambdabar D0bar yields abranching fraction BF(B0 to Lambda Lambdabar D0bar) = (1.05_{-0.44}^{+0.57} \pm0.13)\times 10^{-5}. This may be compared with the large, ~10^{-4}, branchingfraction observed for B0 to p pbar D0bar. The m_{Lambda Lambdabar} enhancementsnear threshold and related angular distributions for the observed modes arealso reported.  PACS:13.25.Hw, 14.40.Nd

Observation of B0 to Lambda Lambdabar K0 and B0 to Lambda Lambdabar K*0 at Belle