Observation of B+ → ψ(3770)K+

The observation of the decay B+→ψ(3770)K+, where the ψ(3770) was constructed in the D0D̄0 and D+D- decay channels, was reported. The branching fraction for the decay was measured and a 90% confidence level upper limit was set for the decay. Data was collected at the Y(4S) resonance by the Belle detector at the KEKB asymmetric-energy e+e- collider. Candidate π0 mesons were identified as pairs of non-charged-track-associated electromagnetic calorimeter clusters.

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Tagir Aushev, Aurelio Bay, Sun Hee Kim, Sanjeev Kumar, Jing Li
2004
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https://infoscience.epfl.ch/record/154293?ln=fr

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Rapport de branchement

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Measurements of B decays to two kaons

Tagir Aushev, Vladislav Balagura, Aurelio Bay, Stewart Cole, Sun Hee Kim, Ji Hyun Kim, Jing Li

We report measurements of B meson decays to two kaons using 253fb-1 of data collected with the Belle detector at the KEKB energy-asymmetric e+e- collider. We find evidence for signals in B+→K̄0K+ and B0→K0K̄0 with significances of 3.0σ and 3.5σ, respectively. (Charge-conjugate modes are included.) The corresponding branching fractions are measured to be B(B+→K̄0K+)=(1.0±0.4±0.1)×10-6 and B(B0→K0K̄0)=(0.8±0.3±0.1)×10-6. These decay modes are examples of hadronic b→d transitions. No signal is observed in the decay B0→K+K-, and we set an upper limit of 3.7×10-7 at 90% confidence level. © 2005 The American Physical Society.

2005

Chargement

Study of the B -> X(3872)K -> D*°-D°K decay at Belle

Nicolas Zwahlen

Recently, many unexpected new particles were discovered with masses around 4 GeV/c2. They are collectively called XYΖ mesons and while some of them have been identified as charmonium states, many others have properties that don't fit into the quark-antiquark classification, and so far remain unclassified. The X(3872) meson was the first to be discovered and is the most studied of these states, and there is a variety of hypotheses on its nature. Other new states include the X(3940) and Y (3940) mesons, which have the same mass and similar widths; it is not clear if they are the same state or not. More experimental evidence is required to understand these particles. We report a search for B → X(3872)K with X(3872) decaying to D0 D0 using a sample of 657 million BB pairs recorded at the γ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The study is performed for both D0 → D0γ and D0 → D0π0 decay modes. We find a total signal of 50.1 events with a mass of 3872.9 MeV/c2, a width of 3.9 MeV/c2 and a product branching fraction Ɓ(B→ X(3872)Κ) × Ɓ(X(3872) → D0 D0) = (0.80 ± 0.20 ± 0.11) × 10-4. The statistical significance of the signal is 7.9σ. Furthermore, from the same study we also set an upper limit at 90% confidence level on the product branching fraction Ɓ(B→ Y(3940)K) × Ɓ(Y (3940) → D*0 D0) < 0.67 × 10-4 which suggests that the X(3940) and Y (3940) mesons are different states.

EPFL2009

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Study of B meson decays to three-body charmless hadronic final states

Tagir Aushev, Sun Hee Kim, Donghyun Kim, Jing Li

We report results of a study of charmless B meson decays to three-body Kππ, KKπ and KKK final states. Measurements of branching fractions for B decays to K=+(0)π+π-, K +K+K-, K0K+K-, K+Ks 0Ks 0 and K s 0Ks 0Ks 0 final states are presented. The decays B0→K0K +K-, B+→K+Ks 0Ks 0 and B0→Ks 0Ks 0Ks 0 are observed for the first time. We also report evidence for B+→K +K-π+ decay. For the three-body final states K0K+π-, Ks 0K s 0π+, K+K+π - and K-π+π+, 90% confidence level upper limits are reported. Finally, we discuss the possibility of using the three-body B0→Ks 0K+K - decay for CP violation studies. The results are obtained with a 78 fb-1 data sample collected at the Y(4S) resonance by the Belle detector operating at the KEKB asymmetric energy e+e- collider. © 2004 The American Physical Society.

2004

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