New determination of the branching ratio of the structure dependent radiative K+ → e+νγ

New determination of the branching ratio of the structure dependent radiative K+ → e+νγ
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结构相关辐射 K 的支化比的新测定

DOI:
10.1016/j.physletb.2023.138020
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发表时间:
2023
期刊:
影响因子:
4.4
通讯作者:
Horie, K.
Horie, K.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Kobayashi, A.;Ito, H.;Bianchin, S.;Cao, T.;Djalali, C.;Dongwi, D.H.;Gautam, T.;Gill, D.;Hasinoff, M.D.;Horie, K.

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在J-PARC E36实验中,用塑料闪烁体/铅夹层探测器测量了结构相关辐射K+ → e + ν e(γ)衰变相对于包含内韧致辐射(IB)过程的K+→ e + ν e(γ)衰变的分支比(Ke 2(γ)),与以前用CsI(Tl)量热计测量的E36实验不同.在分析中,还考虑了IB对SD辐射衰减的影响,计算公式为Ke 2 γ(γ)SD。将新数据与E36试验结果进行修正,求得新的B r(Ke 2 γ(γ)SD)/B r(Ke 2(γ))= 1.20±0.07。这与最近的格点QCD计算结果一致,但大于手征微扰理论(ChPT)在O(p4)阶的预期值和以前的KLOE值。利用KLOE论文中描述的将形状因子与分支比联系起来的方法,本文的结果也与基于规范非定域手征夸克模型的形状因子预测一致,但大于ChPT在O(p6)阶的预测.
The branching ratio of the structure dependent (SD) radiative K+→ e+ ν e γ decay relative to that of the K+→ e+ ν e (γ) decay including the internal bremsstrahlung (IB) process (K e 2 (γ)) has been measured in the J-PARC E36 experiment using plastic scintillator/lead sandwich detectors, in contrast to the previous E36 measurement, which used a CsI (Tl) calorimeter. In the analysis, the effect of IB was also taken into account in the SD radiative decay as K e 2 γ (γ) SD. By combining the new data with the previous E36 result after revision for the IB correction for K e 2 γ (γ) SD, a new value B r (K e 2 γ (γ) SD)/B r (K e 2 (γ))= 1.20±0.07 has been determined. This is consistent with a recent lattice QCD calculation, but larger than the expectation of Chiral Perturbation Theory (ChPT) at order O (p 4) and the previous KLOE value. Using the method to relate form factor and branching ratio described in the KLOE paper, the present result is also consistent with the form factor prediction based on a gauged nonlocal chiral quark model, but larger than that from ChPT at order O (p 6).
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