摘要：
We study the CP asymmetry of B-+/--> omega K-+/- with the inclusion of the rho - omega mixing mechanism. It is shown that the CP asymmetry of B-+/--> omega K-+/- experimentally measured (ACPexp) and conventionally defined (ACPcon) are in fact different, which relation can be illustrated as ACPexp=ACPcon+Delta ACP rho omega, with Delta ACP rho omega the rho - omega mixing contribution to ACPexp. The numerical value of Delta ACP rho omega is extracted from the experimental data of B-+/--> pi (+)pi K--(+/-) and is found to be comparable with ACPexp, hence, non-negligible. The conventionally defined CP asymmetry, ACPcon, is obtained from the values of ACPexp and Delta ACP rho omega, and is compared with the theoretical calculations in the literature.
摘要：
This study is to distinguish peripheral lung cancer and pulmonary inflammatory pseudotumor using CT-radiomics features extracted from PET/CT images. In this study, the standard 18F-fluorodeoxyglucose positron emission tomography/ computed tomography (18 F-FDG PET/CT) images of 21 patients with pulmonary inflammatory pseudotumor (PIPT) and 21 patients with peripheral lung cancer were retrospectively collected. The dataset was used to extract CT-radiomics features from regions of interest (ROI), The intra-class correlation coefficient (ICC) was used to screen the robust feature from all the radiomic features. Using, then, statistical methods to screen CT-radiomics features, which could distinguish peripheral lung cancer and PIPT. And the ability of radiomics features distinguished peripheral lung cancer and PIPT was estimated by receiver operating characteristic (ROC) curve and compared by the Delong test. A total of 435 radiomics features were extracted, of which 361 features showed relatively good repeatability (ICC ≥ 0.6). 20 features showed the ability to distinguish peripheral lung cancer from PIPT. these features were seen in 14 of 330 Gray-Level Co-occurrence Matrix features, 1 of 49 Intensity Histogram features, 5 of 18 Shape features. The area under the curves (AUC) of these features were 0.731 ± 0.075, 0.717, 0.748 ± 0.038, respectively. The P values of statistical differences among ROC were 0.0499 (F9, F20), 0.0472 (F10, F11) and 0.0145 (F11, Mean4). The discrimination ability of forming new features (Parent Features) after averaging the features extracted at different angles and distances was moderate compared to the previous features (Child features). Radiomics features extracted from non-contrast CT based on PET/CT images can help distinguish peripheral lung cancer and PIPT.
作者机构：
[张振华] Department of Nuclear Physics, School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China;[Qiu Q.-T.; 陈进琥; 马长升; 段敬豪] Department of Radiation Physics Technology, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, 250117, China;[刘陈路] Department of Nuclear Physics, School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China, Department of Radiation Physics Technology, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, 250117, China
通讯机构：
[Zhang, Z.-H.] D;Department of Nuclear Physics, China
作者机构：
[Qi, Jing-Juan] Zhejiang Wanli Univ, Jr Coll, Ningbo 315101, Zhejiang, Peoples R China.;[Wang, Zhen-Yang] Ningbo Univ, Phys Dept, Ningbo 315211, Zhejiang, Peoples R China.;[Kang, Xian-Wei; Guo, Xin-Heng] Beijing Normal Univ, Coll Nucl Sci & Technol, Beijing 100875, Peoples R China.;[Zhang, Zhen-Hua] Univ South China, Sch Nucl & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Guo, Xin-Heng] B;[Zhang, Zhen-Hua] U;Beijing Normal Univ, Coll Nucl Sci & Technol, Beijing 100875, Peoples R China.;Univ South China, Sch Nucl & Technol, Hengyang 421001, Hunan, Peoples R China.
摘要：
In this work, within the QCD factorization approach, we study the localized integrated CPviolation in the B- -> pi(-) pi(+) pi(-) decay and the branching fraction of the B- -> sigma pi(-) decay. Both the resonance and nonresonance contributions are included when we study the localized CPasymmetry in the B- -> pi(-) pi(+) pi(-) decay. The resonance contributions from the scalar sigma(600) and vector rho(0)(770) mesons are included. For the sigma(600) meson, we apply both the Breit-Wigner and Bugg models to deal with its propagator, and obtain B(B- -> sigma(600)pi(-)) < 1.67 x 10(-6) and B(B- -> sigma(600)pi(-)) < 1.946 x10(-5) in these two models, respectively. We find that there is no allowed divergence parameters.Sand fSto satisfy the experimental data A(CP) (pi(-) pi(+) pi(-)) = 0.584 +/- 0.082 +/- 0.027 +/- 0.007 in the region m(pi+pi-high)(2) > 15GeV(2) and m(pi+pi-low)(2) < 0.4GeV(2) and the upper limit of B(B--> sigma(600)pi(-)) in the Breit-Wigner model, however, there exists the region rho(S) is an element of[1.70, 3.34] and phi(S) is an element of[0.50, 4.50] satisfying the data for A(CP)(pi(-) pi(+) pi(-)) and the upper limit of B(B- -> sigma(600)pi(-)) in the Bugg model. This reveals that the Bugg model is more plausible than the Breit-Wigner model to describe the propagator of the sigma(600) meson even though the finite width effects are considered in both models. The large values of rho(S) Sindicate that the contributions from weak annihilation and hard spectator scattering processes are both large, especially, the weak annihilation contribution should not be neglected for B decays to final states including a scalar meson. (C) 2019 The Author(s). Published by Elsevier B.V.
作者机构：
[Qi, Jing-Juan; Guo, Xin-Heng] Beijing Normal Univ, Coll Nucl Sci & Technol, Beijing 100875, Peoples R China.;[Wang, Zhen-Yang] Ningbo Univ, Dept Phys, Ningbo 315211, Zhejiang, Peoples R China.;[Zhang, Zhen-Hua] Univ South China, Sch Nucl & Technol, Hengyang 421001, Hunan, Peoples R China.;[Wang, Chao] Northwestern Polytech Univ, Ctr Ecol & Environm Sci, Key Lab Space Biosci & Biotechnol, Xian 710072, Peoples R China.
通讯机构：
[Guo, Xin-Heng] B;[Zhang, Zhen-Hua] U;Beijing Normal Univ, Coll Nucl Sci & Technol, Beijing 100875, Peoples R China.;Univ South China, Sch Nucl & Technol, Hengyang 421001, Hunan, Peoples R China.
摘要：
In this work, we study the localized CP violation in B−→K−π+π− and B−→K−σ(600) decays by employing the quasi-two-body QCD factorization approach. Both the resonance and the nonresonance contributions are studied for the B−→K−π+π− decay. The resonance contributions include those not only from [ππ] channels including σ(600), ρ0(770) and ω(782) but also from [Kπ] channels including K0*(700)(κ), K*(892), K0*(1430), K*(1410), K*(1680) and K2*(1430). By fitting the four experimental data ACP(K−π+π−)=0.678±0.078±0.0323±0.007 for mK−π+2<15 GeV2 and 0.08<mπ+π−2<0.66 GeV2, ACP(B−→K0*(1430)π−)=0.061±0.032, B(B−→K0*(1430)π−)=(39−5+6)×10−6 and B(B−→σ(600)π−→π−π+π−)<4.1×10−6, we get the end-point divergence parameters in our model, ϕS∈[1.77,2.25] and ρS∈[2.39,4.02]. Using these results for ρS and ϕS, we predict that the CP asymmetry parameter ACP∈[−0.34,−0.11] and the branching fraction B∈[6.53,17.52]×10−6 for the B−→K−σ(600) decay. In addition, we also analyze contributions to the localized CP asymmetry ACP(B−→K−π+π−) from [ππ], [Kπ] channel resonances and nonresonance individually, which are found to be ACP(B−→K−[π+π−]→K−π+π−)=0.509±0.042, ACP(B−→[K−π+]π→K−π+π−)=0.174±0.025 and ACPNR(B−→K−π+π−)=0.061±0.0042, respectively. Comparing these results, we can see that the localized CP asymmetry in the B−→K−π+π− decay is mainly induced by the [ππ] channel resonances while contributions from the [Kπ] channel resonances and nonresonance are both very small.
期刊：
EUROPEAN PHYSICAL JOURNAL C,2018年78(10):1-8 ISSN：1434-6044
通讯作者：
Qi, Jing-Juan
作者机构：
[Qi, Jing-Juan; Guo, Xin-Heng] Beijing Normal Univ, Coll Nucl Sci & Technol, Beijing 100875, Peoples R China.;[Wang, Zhen-Yang] Ningbo Univ, Dept Phys, Ningbo 315211, Zhejiang, Peoples R China.;[Zhang, Zhen-Hua] Univ South China, Sch Nucl & Technol, Hengyang 421001, Hunan, Peoples R China.;[Xu, Jing] Yantai Univ, Dept Phys, Yantai 264005, Peoples R China.
通讯机构：
[Qi, Jing-Juan] B;Beijing Normal Univ, Coll Nucl Sci & Technol, Beijing 100875, Peoples R China.
摘要：
Within the QCD factorization approach, we study the CP violations in
$$B^-\rightarrow K^-\pi ^+\pi ^-$$
and
$$B^-\rightarrow K^- f_0(500)$$
decays. We find the experimental data of the localized CP asymmetry in
$$B^-\rightarrow K^-\pi ^+\pi ^-$$
decays in the region
$$m_{K^-\pi ^+}^2<15$$
$$\mathrm {GeV}^2$$
and
$$0.08<m_{\pi ^+\pi ^-}^2<0.66$$
$$\mathrm {GeV}^2$$
can be explained by the interference of two intermediate resonances,
$$\rho ^0(770)$$
and
$$f_0(500)$$
when the parameters in our interference model are in the allowed ranges, i.e. the relative strong phase
$$\delta \in [2.124, 5.976]$$
and the end-point divergence parameters
$$\rho _S\in [5.692, 8]$$
and
$$\phi _S \in [0, 2\pi ]$$
. With the obtained allowed ranges for
$$\rho _S$$
and
$$\phi _S$$
, we obtain the predictions for the CP asymmetry parameter
$$A_{CP} \in [-0.115, -0.151]$$
and the branching fraction
$${\mathcal {B}} \in [3.763, 20.014]\times 10^{-5}$$
for
$$B^-\rightarrow K^-f_0(500)$$
decay modes.
通讯机构：
School of Nuclear Science and Technology, University of South China, Hengyang, China
关键词：
温室大棚;固体径迹蚀刻法;放射性水平;氡浓度
摘要：
本项目使用固体径迹蚀刻法、BH1936低本底多道γ能谱仪对河北省沧州市南皮县某村庄两个传统的蔬菜温室大棚和南华大学某现代化玻璃大棚内的放射性水平进行测量。结果显示,三个大棚平均氡浓度分别为136、89、8.8 Bq/m^3。前两个大棚土壤中^40K、^232Th、^226Ra三种放射性核素的比活度较为正常,但空气中氡浓度偏高。作业人员年均有效剂量分别为1.27、1.13、0.94 m Sv/a。有效通风可以显著降低大棚中氡浓度,保障作业人员的身体健康。
