Sneha Malde

Abstract:

Using a 2.93     fb − 1 data sample of electron-positron collisions taken with the BESIII detector at a center-of-mass energy of 3.773 GeV, which corresponds to ( 8296 ± 31 ± 64 ) × 10 3 D + D − pairs, we search for the baryon and lepton number violating decays D + → ¯ Λ ( ¯ Σ 0 ) e + and D + → Λ ( Σ 0 ) e + . No obvious signals are found with the current statistics and upper limits on the branching fractions of these four decays are set at the level of 10 − 6 at 90% confidence level.

Abstract:

© 2020, The Author(s). A measurement of the Ξcc++ mass is performed using data collected by the LHCb experiment between 2016 and 2018 in pp collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.6 fb−1. The Ξcc++ candidates are reconstructed via the decay modes Ξcc++→Λc+K−π+π+ and Ξcc++→Ξc+π+. The result, 3621.55 ± 0.23 (stat) ± 0.30 (syst) MeV/c2, is the most precise measurement of the Ξcc++ mass to date. [Figure not available: see fulltext.].

Abstract:

Using a sample of 1.31×109 J/ψ events collected with the BESIII detector, we perform a search for the rare decay η′→4π0 via J/ψ→γη′. No significant η′ signal is observed in the 4π0 invariant mass spectrum. With a Bayesian approach, the upper limit on the branching fraction is determined to be B(η′→4π0)<4.94×10-5 at the 90% confidence level, which is a factor of 6 smaller than the previous experimental limit.

Abstract:

© 2020, The Author(s). In figure 11 of the original paper.