Unitary Symmetry and Nonleptonic Decays

Cabibbo, N.

doi:10.1103/physrevlett.12.62

Cited by 184 publications

(47 citation statements)

References 5 publications

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“…PACS numbers: 11.30.Er, 12.15.Hh, 13.25.Hw CP violation in the Standard Model is due to a complex phase in the Cabibbo-KobayashiMaskawa (CKM) quark-mixing matrix [1,2]. At present, CP violation has been clearly observed by the BaBar [3] and Belle [4] collaborations in the decay B 0 → J/ψ K 0 S , while many other modes provide additional information on CP violating parameters.…”

Section: Introductionmentioning

confidence: 99%

Measurement of branching fraction and time-dependentCPasymmetry parameters inB0→D+D−
Dalseno¹,
Adachi²,
Aihara³
et al. 2007
Phys. Rev. D
23
1
16
0
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Section: Introductionmentioning

confidence: 99%

Measurement of branching fraction and time-dependentCPasymmetry parameters inB0→D+D−
Dalseno¹,
Adachi²,
Aihara³
et al. 2007
Phys. Rev. D
23
1
16
0
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“…It is sensitive to the product of the B meson decay constant f B , and the absolute value of the CabibboKobayashi-Maskawa matrix element |V ub | [2]. In the SM the branching fraction is given by: where G F is the Fermi constant, m B and m τ are, the B + meson and τ lepton masses, respectively, and τ B + is the B + lifetime.…”

mentioning

confidence: 99%

Evidence ofB+→τ+νdecays with hadronicBtags

Lees¹,

Poireau²,

Tisserand³

et al. 2013

Phys. Rev. D

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We present a search for the decay B + → τ + ν using 467.8 × 10 6 BB pairs collected at the Υ (4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. We select a sample of events with one completely reconstructed B − in the hadronic decay mode (B − → D ( * )0 X − and B − → J/ψ X − ). We examine the rest of the event to search for a B + → τ + ν decay. We identify the τ + lepton in the following modes: τ + → e + νν, τ + → µ + νν, τ + → π + ν and τ + → ρ + ν. We find an excess of events with respect to the expected background, which excludes the null signal hypothesis at the level of 3.8σ (including systematic uncertainties) and corresponds to a branching fraction central value of B(B + → τ + ν) = (1.83PACS numbers: 13.25.Hw The study of the purely leptonic decay B + → τ + ν [1] is of particular interest to test the predictions of the Standard Model (SM) and to probe of new physics effects. It is sensitive to the product of the B meson decay constant f B , and the absolute value of the CabibboKobayashi-Maskawa matrix element |V ub | [2]. In the SM the branching fraction is given by: The process is sensitive to possible extensions of the SM. For instance, in two-Higgs doublet models (2HDM) [6] and in minimal supersymmetric extensions [7] it can be mediated by a charged Higgs boson. A branching fraction measurement can, therefore, also be used to constrain the parameter space of new physics models.The data used in this analysis were collected with the BABAR detector at the PEP-II storage ring. The sample corresponds to an integrated luminosity of 426 fb −1 at the Υ (4S) resonance. The sample contains (467.8±5.1)×10 6 4 BB decays (N BB ). The detector is described in detail elsewhere [12]. Charged particle trajectories are measured in the tracking system composed of a five-layer double-sided silicon vertex tracker and a 40-layer drift chamber, operating in a 1.5 T solenoidal magnetic field. A Cherenkov detector is used for charged π-K discrimination, a CsI calorimeter for photon and electron identification, and the flux return of the solenoid, which consists of layers of iron interspersed with resistive plate chambers or limited streamer tubes, for muon and neutral hadron identification.We use a Monte Carlo (MC) simulation based on GEANT4 [13] to estimate signal selection efficiencies and to study backgrounds. In MC simulated signal events, one B + meson decays as B + → τ + ν and the other decays in any final state. The BB and continuum MC samples are equivalent to approximately 3 times and 1.5 times the data sample, respectively. Beam-related background and detector noise are sampled from data and overlaid on the simulated events.We reconstruct an exclusive decay of one of the B mesons in the event (which we refer to as the tag-B) and examine the rest of the event for the experimental signature of B + → τ + ν. The tag-B reconstruction can be performed by looking at both hadronic B decays and semileptonic B decays. Published results from both BABAR and Belle are summarized in Table I.We reconstruct the...

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“…In the flavor SU(3) symmetry limit of strong interaction with no electromagnetic or quark mass difference correction, charge-conjugation oddness of parity-violating H W requires that K → ππ be forbidden in the I = 0 channel [13]. Therefore, the K → ππ decay amplitude vanishes at p decay through pure weak interaction (i.e., no electromagnetic or quark mass difference correction) shows the same behavior.…”

Section: Zeros Of Decay Amplitudementioning

confidence: 65%

ExTRAPOLATION OF K→ππ DECAY AMPLITUDE

Suzuki

2001

Int. J. Mod. Phys. A

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We examine the uncertainties involved in the off-mass-shell extrapolation of the K → ππ decay amplitude with emphasis on those aspects that have so far been overlooked or ignored. Among them are initial-state interactions, choice of the extrapolated kaon field, and the relation between the asymptotic behavior and the zeros of the decay amplitude. In the inelastic region the phase of the decay amplitude cannot be determined by strong interaction alone and even its asymptotic value cannot be deduced from experiment. More a fundamental issue is intrinsic nonuniqueness of off-shell values of hadronic matrix elements in general. Though we are hampered with complexity of intermediate-energy meson interactions, we attempt to obtain a quantitative idea of the uncertainties due to the inelastic region and find that they can be much larger than more optimistic views portray. If large uncertainties exist, they have unfortunate implications in numerical accuracy of computation of the direct CP violation parameter ǫ ′ .

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Unitary Symmetry and Nonleptonic Decays

Abstract: This is a library Circulating Copy which may be borrowed for two weeks. .For a personal retention copy, call Tech. Info. Division, Ext. 5545 UNITARY SYMMETRY AND NONLEPTONIC DECAYS ' '

Cited by 184 publications

References 5 publications

Measurement of branching fraction and time-dependentCPasymmetry parameters inB0→D+D−
Dalseno¹,
Adachi²,
Aihara³
et al. 2007
Phys. Rev. D
23
1
16
0
View full text Add to dashboard Cite

Measurement of branching fraction and time-dependentCPasymmetry parameters inB0→D+D−
Dalseno¹,
Adachi²,
Aihara³
et al. 2007
Phys. Rev. D
23
1
16
0
View full text Add to dashboard Cite

Evidence ofB+→τ+νdecays with hadronicBtags

ExTRAPOLATION OF K→ππ DECAY AMPLITUDE

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Unitary Symmetry and Nonleptonic Decays

Abstract: This is a library Circulating Copy which may be borrowed for two weeks. .For a personal retention copy, call Tech. Info. Division, Ext. 5545 UNITARY SYMMETRY AND NONLEPTONIC DECAYS ' '

Cited by 184 publications

References 5 publications

Measurement of branching fraction and time-dependentCPasymmetry parameters inB0→D*+D*−Dalseno1, Adachi2, Aihara3 et al. 2007Phys. Rev. D231160View full textAdd to dashboardCite

Measurement of branching fraction and time-dependentCPasymmetry parameters inB0→D*+D*−Dalseno1, Adachi2, Aihara3 et al. 2007Phys. Rev. D231160View full textAdd to dashboardCite

Evidence ofB+→τ+νdecays with hadronicBtags

ExTRAPOLATION OF K→ππ DECAY AMPLITUDE

Contact Info

Product

Resources

About

Measurement of branching fraction and time-dependentCPasymmetry parameters inB0→D+D−
Dalseno¹,
Adachi²,
Aihara³
et al. 2007
Phys. Rev. D
23
1
16
0
View full text Add to dashboard Cite

Measurement of branching fraction and time-dependentCPasymmetry parameters inB0→D+D−
Dalseno¹,
Adachi²,
Aihara³
et al. 2007
Phys. Rev. D
23
1
16
0
View full text Add to dashboard Cite