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In contrast with B0-ˉB0, Bs-ˉBs mixing where the standard model(SM) contributions overwhelm that of the new physics beyond standard model(BSM), a measured relatively large D0-ˉD0mixing where the SM contribution is negligible, definitely implies the existence of the new physics BSM. It is natural to consider that the rare decays of D meson might be more sensitive to new physics, and the decay mode D0→μ+μ-could be an ideal area to search for new physics because it is a flavor changing process. In this work we look for a trace of the new physics BSM in the leptonic decays of D0. Concretely we discuss the contributions of unparticle or an extra gauge boson Z while imposing the constraints set by fitting the D0-ˉD0mixing data. We find that the long-distance SM effects for D0→lˉl still exceed those contributions of the BSM under consideration, but for a double-flavor changing process such as D0→μ±e, the new physics contribution would be significant. 相似文献
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The CP violation in the D system is predicted to be an unobserved level in the Standard Model. In this paper, we describe the method of searching for CP violation decay processes with the coherently produced D00 mesons from the ψ(3770) decay. The CP violation decay processes can be searched for at the BES-III experiment. The experimental sensitivity for searching for the CP violation can reach about a 10-4 level with a ψ(3770) data sample of about 20 fb-1. 相似文献
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In contrast with B0-B0, Bs-Bs mixing where the standard model (SM) contributions overwhelm that of the new physics beyond standard model (BSM), a measured relatively large D0-D0 mixing where the SM contribution is negligible, definitely implies the existence of the new physics BSM. It is natural to consider that the rare decays of D meson might be more sensitive to new physics, and the decay mode D0→μ+μ- could be an ideal area to search for new physics because it is a flavor changing process. In this work we look for a trace of the new physics BSM in the leptonic decays of D0. Concretely we discuss the contributions of unparticle or an extra gauge boson Z' while imposing the constraints set by fitting the D0- D0 mixing data. We find that the long-distance SM effects for D0→l1 still exceed those contributions of the BSM under consideration, but for a double-flavor changing process such as D0→μ±e+, the new physics contribution would be significant. 相似文献
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杨丽桃 李浩斌 岳骞 康克军 程建平 李元景 王子敬 M.Agartioglu 安海鹏 常建平 陈景瀚 陈云华 邓智 杜强 宫辉 何力 胡津纬 胡庆东 黄瀚雄 贾历平 江灏 李红 李荐民 李金 李霞 李学潜 李玉兰 林枫凯 林兴德 刘书魁 刘仲智 马豪 马菁露 潘辉 任杰 阮锡超 B.Sevda Vivek Sharma 申满斌 Lakhwinder Singh Manoj Kumar Singh 唐昌建 唐维优 田阳 王继敏 王力 王青 王轶 吴世勇 吴玉成 幸浩洋 徐音 薛涛 杨松伟 易难 喻纯旭 于海军 岳剑峰 曾雄辉 曾鸣 曾志 张云华 赵明刚 赵伟 周济芳 周祖英 朱敬军 朱忠华 《中国物理C(英文版)》2018,(2)
We report results of a search for light weakly interacting massive particle(WIMP) dark matter from the CDEX-1 experiment at the China Jinping Underground Laboratory(CJPL). Constraints on WIMP-nucleon spin-independent(SI) and spin-dependent(SD) couplings are derived with a physics threshold of 160 eVee, from an exposure of 737.1 kg-days. The SI and SD limits extend the lower reach of light WIMPs to 2 GeV and improve over our earlier bounds at WIMP mass less than 6 GeV. 相似文献
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We give a brief discussion on the measurement of the cross section for D^-D production around the ψ(3770) resonance, and point out a new calculation of the cross sections based on the absolute measurements. Compared with single tag and double tag analyses, the new calculation provides us with many more opportunities to perform the cross section measurement. 相似文献
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Experimental Sensitivities on Searching for Rare and Forbidden Decays of Charm Mesons at BES-Ⅲ 下载免费PDF全文
We discuss the Monte Carlo studies of searching for the rare and forbidden pure-leptonic and semi-leptonic decays of D^+,0 and Ds^+ mesons, based on a full Monte Carlo simulation for the BES-Ⅲ detector, with the BES-Ⅲ Ofttine Software System. The experimental sensitivities of searching for 36 rare and forbidden charm meson decays are estimated. 相似文献
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We present Monte Carlo studies on the singly tagged D mesons, which are crucial in the absolute measurements of D meson decays, based on a full Monte Carlo simulation for the BES-III detector, with the BES-III Offline Software System. The expected detection efficiencies and mass resolutions of the tagged D mesons are well estimated. 相似文献
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The recent measurements on RK and Rπ imply that there exists a possible violation of the leptonic flavor universality which is one of the cornerstones of the Standard Model. It is suggested that a mixing between sterile and active neutrinos might induce such a violation. In this work we consider the scenarios with one or two sterile neutrinos to explicitly realize the data while the constraints from the available experiments have been taken into account. Moreover, as indicated in literature, the deviation of the real PMNS matrix from the symmetric patterns may be due to a μ-τ asymmetry, therefore the measurements on RD(Ds)eμ=Γ(D(Ds)→ e+νe)/Γ(D(Ds)→ μ+νμ) and RD(Ds)μτ=Γ(D(Ds)→ μ+νμ)/Γ(D(Ds)→ τ+ντ) (and for some other heavy mesons B± and Bc etc.) may shed more light on the physics responsible for the violation of the leptonic flavor universality. The data of BESⅢ are available to test the universality and that of future charm-tau factories will provide more accurate information. In this work, we will discuss RD(Ds)eμ and RD(Ds)μτ in detail and also briefly consider the cases for B± and Bc. 相似文献