RARE B MESON DECAYS WITHOUT CHARM FROM BELLE

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 452-457
Author(s):  
◽  
BRENDAN C. K. CASEY
Keyword(s):  
B Meson ◽  
Meson Decay ◽  
B Meson Decays ◽  
Meson Decays ◽  
B Meson Decay ◽  
Decay Modes ◽  
Preliminary Results ◽  
Text Mode ◽  
Belle Experiment ◽  
Pseudo Scalar

We report preliminary results on searches for radiative and charmless hadronic B meson decay modes using 5.27 million [Formula: see text] pairs recorded on the ϒ(4S) resonance by the Belle experiment at KEKB. Both inclusive b → sγ and exclusive B → K*γ modes are observed and limits are set on the ratio B → ργ/ B→ K*γ. We see evidence for the [Formula: see text] mode B+ → ϕ K+, and several pseudo-scalar + pseudo-scalar modes. Significant signals are observed in the K+ π-, K+ π0, and K0π0 modes. We see evidence for the K0π+, π+π-, and π+ π0 modes however, the significance is small. No signal is observed in either the K+K- or K0K+ modes.

Moments in inclusive semileptonic B meson decays at the Belle experiment

2015 ◽  
Vol 30 (10) ◽  
pp. 1543003
Author(s):  
Christoph Schwanda
Keyword(s):  
High Energy Physics ◽  
B Meson ◽  
Theoretical Calculations ◽  
High Energy ◽  
B Meson Decays ◽  
Good Science ◽  
Meson Decays ◽  
Belle Experiment ◽  
B Quark ◽  
Scheduled Time

Since my return to Austria in the year 2003, I have measured observables in inclusive B meson decays at the Belle experiment and worked together with theorists on the interpretation of these measurements in terms of the Cabibbo–Kobayashi–Maskawa matrix element |Vcb|. And in fact, only this memorial book project made me fully aware of Kolya Uraltsev's ground breaking theoretical contributions to this field. He was not a theorist who talked a lot to an experimentalist like me, and maybe this is not a bad thing for good science. I certainly remember his enthusiasm from conferences, e.g., when I was powerless to keep his presentation to the scheduled time as a session chair at the CKM2005 workshop in San Diego. Still I feel there is some amount of irony in the fact, that I know so little about a person whose work has been so decisive for my career in high energy physics. To commemorate Kolya Uraltsev's pioneering work on inclusive semileptonic B meson decays B → Xcℓν and on the Heavy Quark Expansion (HQE), which has already been paid tribute to in other articles in this volume, I will review the measurement of the electron energy and the hadronic mass moments in B → Xcℓν decays performed at the Belle experiment. These measurements allow to both test his theoretical calculations and to extract |Vcb| and non-perturbative quantities, such as the b-quark mass, from his formulae.

NEW RESULTS ON CP VIOLATION IN B MESON DECAY

2007 ◽  
Vol 22 (02n03) ◽  
pp. 274-281
Author(s):  
◽  
TAKEO KAWASAKI
Keyword(s):  
Cp Violation ◽  
B Meson ◽  
Unitarity Triangle ◽  
Cp Asymmetry ◽  
B Meson Decays ◽  
B Meson Decay ◽  
The Status ◽  
Mixing Matrix ◽  
Belle Experiment ◽  
Violation Measurement

The Belle experiment has started in 1999 and has collected more than 600 fb-1 data at the ϒ(4S) resonance with the KEK-B asymmetric energy e+e- collider. In this contribution, the results of CP-violation measurement in B meson decays are presented. The large CP asymmetry arises thorough the interference between [Formula: see text] mixing and decay. The results yield constraints on the angles of the unitarity triangle, which is related to the Kobayashi-Maskawa quark mixing matrix. We discuss the status of the measurements on ϕ1, ϕ2 and ϕ3 with various methods.

scholarly journals Study of the sensitivity to CKM angle γ under simultaneous determination from multiple B meson decay modes

2020 ◽  
Vol 102 (5) ◽  
Author(s):  
J. Garra Ticó ◽  
V. Gibson ◽  
S. C. Haines ◽  
C. R. Jones ◽  
M. Kenzie ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
B Meson ◽  
Meson Decay ◽  
B Meson Decay ◽  
Decay Modes ◽  
Ckm Angle

A SEARCH FOR B→τν

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 636-638 ◽  
Author(s):  
◽  
JOHN GREGG THAYER
Keyword(s):  
Confidence Level ◽  
B Meson ◽  
Branching Fraction ◽  
Slight Modification ◽  
B Meson Decays ◽  
Meson Decays ◽  
Decay Modes ◽  
Upper Limit ◽  
Charged B Meson

We report results of a search for B→τν in a sample of 9.7 million charged B meson decays. The search uses both πν and [Formula: see text] decay modes of the τ, and demands exclusive reconstruction of the companion [Formula: see text] decay to suppress background. We set an upper limit on the branching fraction ℬ(B→τν)<8.4×10-4 at 90% confidence level. With slight modification to the analysis we also establish [Formula: see text] at 90% confidence level.

INVESTIGATION OF B-MESON DECAYS INTO BARYONS WITH THE BABAR DETECTOR

2011 ◽  
Vol 26 (03n04) ◽  
pp. 545-548
Author(s):  
◽  
TORSTEN LEDDIG
Keyword(s):  
Mass Distribution ◽  
B Meson ◽  
B Meson Decays ◽  
Decay Channels ◽  
Meson Decays ◽  
Decay Modes ◽  
Babar Detector ◽  
Baryon Resonances

We report on investigations of B-meson decays into baryons with the BABAR detector. The comparison of different decay channels reveals that higher multiplicities are preferred for these decays. Furthermore, an enhancement in the invariant baryon-antibaryon mass distribution can be observed in several baryonic decay modes. In addition, the study of baryon resonances seen in baryonic B-meson decays is presented.

scholarly journals ROLE OF FINAL STATE INTERACTIONS IN THE B MESON DECAY INTO TWO PIONS

2006 ◽  
Vol 21 (22) ◽  
pp. 4425-4437 ◽  
Author(s):  
ALDO DEANDREA ◽  
MASSIMO LADISA ◽  
GIUSEPPE NARDULLI ◽  
VINCENZO LAPORTA ◽  
PIETRO SANTORELLI
Keyword(s):  
B Meson ◽  
Meson Decay ◽  
Regge Model ◽  
Final State ◽  
B Meson Decays ◽  
B Meson Decay ◽  
Regge Trajectories ◽  
Final State Interactions ◽  
Theory And Experiment

We estimate final state interactions in the B-meson decays into two pions by the Regge model. We consider Pomeron exchange and the leading Regge trajectories that can relate intermediate particles to the final state. In some cases, most notably B→π0π0 and B→π+π-, the effect is relevant and produces a better agreement between theory and experiment.

scholarly journals Lepton flavor non-universality in B-meson decays from a U(2) flavor model

2015 ◽  
Vol 2015 (11) ◽  
Author(s):  
Adam Falkowski ◽  
Marco Nardecchia ◽  
Robert Ziegler
Keyword(s):  
B Meson ◽  
B Meson Decays ◽  
Meson Decays ◽  
Lepton Flavor

scholarly journals |Vub| Determination by B → Dsπ

2003 ◽  
Vol 18 (22) ◽  
pp. 1557-1567 ◽  
Author(s):  
Hideaki Hayakawa ◽  
Kaoru Hosokawa ◽  
Takeshi Kurimoto
Keyword(s):  
Perturbative Qcd ◽  
B Meson ◽  
B Meson Decays ◽  
Meson Decays ◽  
Factorizable Contribution

We investigate [Formula: see text] decay in perturbative QCD approach which has recently been applied to B-meson decays. [Formula: see text] decay (and its charge conjugated mode) can be one of the hopeful modes to determine |Vub| since it occurs through b → u transition only. We estimate both factorizable and non-factorizable contribution, and show that the non-factorizable contribution is much less than the factorizable one. Our calculation gives [Formula: see text].

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