Inclusive eta´ production in B decays and the enhancement due to charged technipions

Lu, G. R.; Xiao, Z. J.; Hongkai, Guo; Lu, L. C.

doi:10.1088/0954-3899/25/9/103

Cited by 16 publications

(15 citation statements)

References 22 publications

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“…Since the first observation of unexpectedly large branching ratios for B → Kη ′ decays was reported by CLEO in 1997 [1], the four B → Kη (′) decays have been a "hot" topic for a long time. Although many physicists have made great efforts to explain the pattern of very large branching ratios Br(B → Kη ′ ) and very small branching ratios Br(B → Kη) [2][3][4][5][6][7][8][9], it is still difficult to understand such a pattern in the framework of the standard model(SM).…”

Section: Introductionmentioning

confidence: 99%

Anatomy ofB→Kη(′)decays in different mixing schemes and effects of next-to-leading order contributions in the perturbative QCD approach

et al. 2013

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In this paper we perform a comprehensive study of the four B → Kη (′) decays in the perturbative QCD (pQCD) factorization approach. We calculate the CP-averaged branching ratios and CP-violating asymmetries of B → Kη (′) decays in the ordinary η-η ′ , the η-η ′ -G, and the ηη ′ -G-η c mixing schemes. Besides the full leading order (LO) contributions, all currently known next-to-leading order (NLO) contributions to B → Kη (′) decays in the pQCD approach are taken into account. From our calculations and phenomenological analysis, we find the following. (a) The NLO contributions in general can provide significant enhancements to the LO pQCD predictions for the decay rates of the two B → Kη ′ decays, around 70%−89% in magnitude, but result in relatively small changes to Br(B → Kη). (b) Although the NLO pQCD predictions in all three considered mixing schemes agree well with the data within one standard deviation, those pQCD predictions in the η-η ′ -G mixing scheme provide the best interpretation for the measured pattern of Br(B → Kη (′) ): Br(B 0 → K 0 η) ≈ 1.13 × 10 −6 , Br(B 0 → K 0 η ′ ) ≈ 66.5 × 10 −6 , Br(B ± → K ± η) ≈ 2.36 × 10 −6 , and Br(B ± → K ± η ′ ) ≈ 67.3 × 10 −6 , which agree perfectly with the measured values. (c) The NLO pQCD predictions for the CP-violating asymmetries for the four considered decays are also in good consistent with the data. (d) The newly known NLO contribution to the relevant form factors M F F can produce about a 20% enhancement to the branching ratios Br(B → Kη ′ ), which plays an important role in closing the gap between the pQCD predictions and the relevant data. (e) The general expectations about the relative strength of the LO and NLO contributions from different sources are examined and confirmed by explicit numerical calculations.

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Section: Introductionmentioning

confidence: 99%

Anatomy ofB→Kη(′)decays in different mixing schemes and effects of next-to-leading order contributions in the perturbative QCD approach

et al. 2013

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“…In the SM the decay B → Kη (′) is believed to proceed dominantly through gluonic penguin processes [4,5] and has been evaluated by employing various methods [6,7,8,9,10,11,12,13,14,15,16]. Although great progress have been made during the past decade, but the predictions for Br(B → Kη ′ ) from both the QCD factorization (QCDF) approach [14,17] and the perturbative QCD (pQCD) approach [16,18] in the Feldmann-Kroll-Stech (FKS) mixing scheme of η − η ′ system [19,20] are smaller than the data.…”

Section: Introductionmentioning

confidence: 99%

Branching ratios and CP asymmetries of $B \to K η^{(\prime)}$ decays in the pQCD approach

Xiao,

Zhang,

Liu

et al. 2008

Preprint

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We calculate the branching ratios and CP violating asymmetries of the four B → Kη (′) decays in the perturbative QCD (pQCD) factorization approach. Besides the full leading order contributions, the partial next-to-leading order (NLO) contributions from the QCD vertex corrections, the quark loops, and the chromo-magnetic penguins are also taken into account. The NLO pQCD predictions for the CP-averaged branching ratios are Br(B, and Br(B 0 → K 0 η ′ ) ≈ 50.3 × 10 −6 . The NLO contributions can provide a 70% enhancement to the LO Br(B → Kη ′ ), but a 30% reduction to the LO Br(B → Kη), which play the key role in understanding the observed pattern of branching ratios. The NLO pQCD predictions for the CP-violating asymmetries, such as A dir CP (K 0 S η ′ ) ∼ 2.3% and A mix CP (K 0 S η ′ ) ∼ 63%, agree very well with currently available data. This means that the deviation ∆S = A mix CP (K 0 S η ′ ) − sin 2β in pQCD approach is also very small.

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“…For θ = π, which is the case of even coherent state, state |ψ 4 does not exhibit the amplitudesquared squeezing. Moreover, by substituting x 2 = 0 into expression (21) we can see that the maximum degree of squeezing is obtained for small values of phase difference (see Fig. 5).…”

Section: Two Pseudoclassical Statesmentioning

confidence: 83%

Amplitude-squared squeezing of superposition of coherent states

Ahmad

Ren

et al. 2008

Chinese Phys. B

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This paper discusses the amplitude-squared squeezing for the superposition of two coherent states with their phase differences being separately π/2, 3π/2, and π, as well as for the superposition state of two pseudoclassical states. According to the analysis, it is found that the superposition state of two coherent states with their phase differences π/2 and 3π/2, and the superposition state of two pseudoclassical states both do exhibit the amplitude-squared squeezing. Also, some specific states are found to exhibit even stronger squeezing effects when relative phase of the superposition is equal to the average photon number. Amplitude-squared squeezing is dependent on the difference in phase between two coherent states.

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Inclusive eta´ production in B decays and the enhancement due to charged technipions

Cited by 16 publications

References 22 publications

Anatomy ofB→Kη(′)decays in different mixing schemes and effects of next-to-leading order contributions in the perturbative QCD approach

Anatomy ofB→Kη(′)decays in different mixing schemes and effects of next-to-leading order contributions in the perturbative QCD approach

Branching ratios and CP asymmetries of $B \to K η^{(\prime)}$ decays in the pQCD approach

Amplitude-squared squeezing of superposition of coherent states

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