共查询到20条相似文献,搜索用时 218 毫秒
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本文应用了复合粒子场论的微扰展开理论和自旋为(1/2-1/2)的库仑相互作用原子的Bethe-Salpeter协变波函数的近似解,计算了(e+e-)(μ+μ-)原子的高速飞行下裂解截面及能谱。结果表明(e+e-)原子的裂解截面比前人的计算约小20%。此外,计算还表明(e+e-)及(μ+μ-)原子的单态和三重态裂解截面对任意主量子数n,和极端相对论近似下将精确相等,而前人的计算中只是n=2时才有这一结果,而对n=1时,两者相差约有25%。看来很可能是计算中的错误所致。 相似文献
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本文利用QCD的渐近自由性质,求出一条腿动量平方固定另一条腿动量平方趋于无穷大时的波函数,并把它应用于计算e++e-→π+q+(?)过程(其中π介子相对于层子喷注轴有大的横动量)。计算结果表明,这个过程对e++e-→强子截面的贡献比e++e-→g+q+(?)过程的贡献小得多。 相似文献
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Study of the rare and forbidden decays of η/η' offers a sensitive probe to test fundamental symmetries of quantum chromodynamics and search for new physics beyond the Standard Model. To study the rare decays of η/η' to π+π-e+e-, π+π-μ+μ- and e+e-μ+μ- at the BESⅢ detector, we developed several event generators based on the vector meson dominant model with finite-width corrections and the pseudoscalar mesons mixing theory. The various distributions from event generators are in good agreement with the theoretical predictions, which indicates that the event generators work very well after implemention in the BESⅢ Monte Carlo simulation package. In the BESⅢ physics analysis, the performance of the event generators will be improved in accordance with the distributions of different variables of η/η' from data and the improvement on the theoretical calculations. 相似文献
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LI Jiang LIAO Xiao-Tao YANG Ming YANG Hong-Xun XU Min ZHANG Bing-Xin SHEN Xiao-Yan YANG Yong-Xu 《中国物理快报》2010,27(4)
The decays of J/φ→μ+μ- and J/φ→ e+e- are studied by Monte-Carlo simulation, based on the Beijing Spectrometer (BES)Ⅲ offline software system. The methods of determination of the J/φ event number via J/φ→μ+μ- and J/φ→ e+e- are presented, respectively. These methods can be used to determine the J/φevent number for the coming BESⅢ J/φ data sample. 相似文献
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本文应用复合粒子量子场论的微扰展开式和相对论性的(π&;#177;μ?)、(K&;#177;μ?)的B.S.波函数,计算了在原子核屏蔽库仑场中高能(π&;#177;μ?)、(K&;#177;μ?)原子的裂解能谱和截面。在极端相对论近似下,对大多数原子核,它们的裂解截面分别约为10-18cm2和10-17cm2。利用同样的波函数,还计算了(π&;#177;μ?)→π0+vμ(vμ),(K&;#177;μ?)→K0+vμ(vμ),以及(π&;#177;μ?)→μ++μ-+vμ(vμ),(K&;#177;μ?)→μ++μ-+vμ(vμ)的衰变几率。 相似文献
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我们计算了在e+e-湮灭中轴子的产生截面,建议利用β+放射源在e+e-湮灭实验中寻找轴子。我们还进一步讨论了在这种实验中所用探测器的性能要求。 相似文献
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Using data samples collected at center-of-mass energies of √s=4.009, 4.230, 4.260, and 4.360 GeV with the BES0 detector operating at the BEPC/ collider, we perform a search for the process e+e-→γχc,j (J =0, 1, 2) and find evidence for e+e-→γχc1 and e+e-→γχc2 with statistical significances of 3.0σ and 3.4σ, respectively. The Born cross sections σB(e+e-→γχc,j), as well as their upper limits at the 90% con dence level (C.L.) are determined at each center-of-mass energy. 相似文献
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Motivated by the rst measurement on B(Bs→φμ+μ-) by the CDF Collaboration, we study the supersymmetric e ects in semi-leptonic Bs→φμ+μ- decay. In our evaluations, we analyze the dependences of the dimuon invariant mass spectrum and the forward-backward asymmetry on relevant supersymmetric couplings in the MSSM with and without R-parity. The analyses show that the new experimental upper limits of B(Bs→φμ+μ-)from the LHCb Collaboration could further improve the bounds on sneutrino exchange couplings and (δLLu)23 as well as (δLL,RRu)23 mass insertion couplings. In addition, within the allowed ranges of relevant couplings under the constraints from B(Bs→φμ+μ-), B(B→K(*)μ+μ-) and (Bs→φμ+μ-), the dimuon forward-backward asymmetry and the di erential dimuon forward-backward asymmetry of Bs→φμ+μ-are highly sensitive to the squark exchange contribution and the (δLLu)23 mass insertion contribution. The results obtained in this work will be very useful in searching for supersymmetric signals at the LHC. 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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P. Pakhlov 《中国物理 C》2008,32(6):488-491
We present a search for new charmonium like states in e+e- annihilation using the initial-state radiation and the process e+e-J/ψD(*)D(*). The analyses are based on a huge data sample recorded near the Υ(4s) resonance with the Belle detector at the KEKB e+e- asymmetric-energy collider. 相似文献
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M. Ablikim et al 《中国物理 C》2012,36(11)
Based on 58 million J/ψ events collected by the BESⅡ detector at the BEPC, J/ψ→ΛΛ π+π- is observed for the first time. The branching fraction is measured to be Br(J/ψ→ΛΛ π+π-)=(4.30±0.13±0.99)×10-3, excluding the decays to intermediate states, namely J/ψ→Ξ-Ξ+, J/ψ→Σ(1385)-Σ(1385)+, and J/ψ→Σ(1385)+Σ(1385)-. The branching fractions for these intermediate resonance channels are measured to be:Br(J/ψ→Ξ-Ξ+)=(0.90±0.03±0.18)×10-3, Br(J/ψ→Σ(1385)-Σ(1385)+)=(1.23±0.07±0.30)×10-3,and Br(J/ψ→Σ(1385)+Σ(1385)-)=(1.50±0.08±0.38)×10-3, respectively. The angular distribution is of the form dN/d(cosθ)α(1+αcos2θ) with α=(0.35±0.29±0.06) for J/ψ→Ξ-Ξ+, α=(-0.54±0.22±0.10) for J/ψ→Σ(1385)-Σ(1385)+, and α=(-0.35±0.29±0.06) for J/ψ→Σ(1385)+Σ(1385)-. 相似文献
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本文分析了e+e- 湮没中多重数的实验分布, 指出可能是夸克数目服从四动量守恒限制下的Poisson分布, 加上组合过程影响的结果. 并利用一种在其他方面取得明显成功的夸克组合律作了计算, 得到与实验符合的结果. 还对轻夸克jet作了单独讨论. 相似文献
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We evaluate the rare decays Bs→γe+e- in the standard model, considering the off-shell effect of quarks in Bs meson as well as some contributions neglected in previous works. It is found that the quarks off-shell are large. With the predicted branching ratios at order of 10-8, it is expected that the radiative dileptonic decays will be detected in the LHC-b experiments. 相似文献
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In a combined investigation of B→K(*)l+l- decays, constraints on the related couplings in family non-universal Z' models are derived. We find that within the allowed parameter space, the recently observed forward-backward asymmetry in the B→K(*)l+l- decay can be explained by flipping the signs of the Wilson coefficients C9eff and C10. With the obtained constraints, we also calculate the branching ratio of the Bs→μ+μ- decay. The upper bound of our prediction is nearly an order of magnitude smaller than the upper bound given by the CDF Collaboration recently. 相似文献
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We discuss the production of ηc(2S) through the process e+e-→γηc(2S), where the leading contribution originates from 1-loop electroweak corrections. Adopting some reasonable light-cone distribution amplitudes, we analyze the cross section of this process. As the electron-positron center of mass energy √s=3770 MeV, the typical production cross section of this process is about 1 fb. 相似文献