Mixing and lifetimes summary

Lenz, Alexander; Willocq, S.

doi:10.1088/0954-3899/27/6/317

Cited by 4 publications

(4 citation statements)

References 23 publications

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“…The lifetime ratios of heavy hadrons have been theoretically considered e.g. in [39,40,41,42,43,44,45] and one obtains typically values for τ(Λ b )/τ(B d ) closer to one. Before speaking from a real discrepancy one has to keep in mind however, that τ(Λ b )/τ(B d ) is theoretically in a much worse shape than τ(B + )/τ(B d ), see e.g.…”

Section: Discussionmentioning

confidence: 99%

Form factors of baryons within the framework of light-cone sum rules

Lenz¹

2007

AIP Conference Proceedings

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Section: Discussionmentioning

confidence: 99%

Form factors of baryons within the framework of light-cone sum rules

Lenz¹

2007

AIP Conference Proceedings

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“…The excitation of the ∆ resonance and its propagation through the nuclear medium have been intensively studied in heavy ion reactions [23], in pion, electron, and photon induced reactions [24,25]. An inmedium broadening at normal nuclear matter density of roughly 100 MeV has been extracted from pion nucleus scattering experiments [26].…”

Section: The ∆(1232) Resonancementioning

confidence: 99%

Photoproduction of mesons from nuclei —in-medium properties of hadrons

Krusche

2005

Progress in Particle and Nuclear Physics

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Recent experimental results for the in-medium properties of hadrons obtained with photoproduction of mesons from nuclei are discussed. The experiments were done with the TAPS detector at the tagged photon beam of the MAMI accelerator in Mainz. Measured were the final states π o X, ηX, 2π o X, and π o π ± X for 12 C, 40 Ca, 93 Nb, and 208 Pb up to the second resonance region. The results were used for an investigation of the in-medium properties of the P 33 (1232), the P 11 (1440), the D 13 (1520), and the S 11 (1535) resonances. It was found that the cross sections can be spilt into a component which originates from the low density surface region of the nuclei and a component which scales like the nuclear volume. The energy dependence of the surface component is strikingly similar to the deuteron, it shows a clear signal for the second resonance peak. The volume component is lacking this peak and shows an enhancement at intermediate energies. Furthermore the measurement of coherent η-photoproduction and the final state pπ o from 3 He is discussed in the context of the search for η-mesic nuclei.

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“…As discussed in the introduction, the theoretical predictions for both the charm multiplicity n c and the semileptonic branching ratio B sl used to be in disagreement with the experimental data [7]. This discrepancy decreased a lot after the inclusion of the complete NLL corrections to b → c ūq and b → c cq (q = d, s) [12].…”

Section: Remarks On N C and B Slmentioning

confidence: 99%

“…One interesting subclass of inclusive B-decays is the charmless ones B → X c / . They have been thoroughly investigated in the literature: the calculation for b → q q q with q = d, s and q = u, d, s have been available to next-to-leading logarithms (NLL) for quite some time [4][5][6][7] and the missing piece, b → sg, is what is presented here. Due to the sensitivity of the charmless branching ratio B c / to the poorly known CKM ratio |V ub /V cb |, these decays might be used in order to obtain a better determination of this standard model parameter.…”

Section: Introductionmentioning

confidence: 99%

The decayb→sgat NLL in the standard model

Liniger¹

2001

J. Phys. G: Nucl. Part. Phys.

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I present the Standard Model calculation of the decay rate Γ(b → sg) (g denotes a gluon) at next-to-leading logarithms (NLL). In order to get a meaningful physical result, the decay b → sgg and certain contributions of b → s f f (where f are the light quark flavours u, d and s) have to be included as well. Numerically we get B NLL (b → sg) = (5.0 ± 1.0) • 10 −3which is more than a factor 2 larger than the leading logarithmic result B LL (b → sg) = (2.2 ± 0.8) • 10 −3 . Further, I consider the impact of this contribution on the charmless hadronic branching ratio B c / , which could be used to extract the CKM-ratio |V ub /V cb | with more accuracy. Finally, I have a short look at B c / in scenarios where the Wilson coefficient C 8 is enhanced by new physics.

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Mixing and lifetimes summary

Abstract: We summarize the activities of the Mixing and Lifetimes working group.

Cited by 4 publications

References 23 publications

Form factors of baryons within the framework of light-cone sum rules

Form factors of baryons within the framework of light-cone sum rules

Photoproduction of mesons from nuclei —in-medium properties of hadrons

The decayb→sgat NLL in the standard model

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