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The total cross sections of γγ→γZ process for γγ c.m.s. energy 91.2—2000GeV are presented. W loop contribution is dominating when γγ c.m.s. energy is larger than 140GeV. The total cross section has a maximum, 220 fb(|cosθ|33cm-2·s-1 in which case more than 6000 events for γγ→γZ would be observable. In principle this process provides a test of the non-abelian nature of the standard model, especially the anomalous triple and quartic W-boson vertices. 相似文献
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本文给出了一种新的表述局域模(实的及虚的)的方法。我们引入了变形豫解式的迹P(z).它仅在z平面的实轴上有奇异性,孤立极点对应于实局域模。将P(E+iη)向下解析延拓至第二黎曼面,则其复极点对应于虚的(或不稳定的)局域模。复极点的实部是不稳定局域模的能量,虚部是它寿命的倒数,自然地得到了寿命为正的限制。此能量与寿命符合于相应共振散射的能量与宽度。本文还讨论了实局域模与虚局域模之间的关系。最后,比较了P(z)的奇异性与态密度的变化,并进一步阐明了寿命为正的及负的解之间的差别。指出,一般说来,只有寿命为正的解当作用强度增加时会变成实的局域模,负寿命的解是不会的。 相似文献
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This study concerns the design of an operating system for vehicles in an automated warehouse. The layout of the warehouse and the number and properties of the vehicles are given. The objective is to maximize the throughput. Using a partial enumeration technique, we simulate several alternatives for the control and interplay of the vehicles within a reasonable time horizon. A subproblem is solved by network flow techniques. The algorithm is implemented as part of an automatic control system, and it has led to a satisfactory performance. 相似文献
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We report on a new and convenient high-throughput fluorescence technique for determining antioxidant capacities of hydrophilic
food samples. The new method is called αPROX (anti protein oxidation) and is based on an equimolar complex of diphenylhexatriene
propionic acid (DPHPA) and bovine serum albumin (BSA) in aqueous buffer at pH 7.4. DPHPA is a reporter fluorophore that becomes
nonfluorescent upon free radical-induced oxidation. In a typical assay, the DPHPA/BSA complex is challenged with peroxyl radicals
and shows almost the same susceptibility to oxidation as unlabeled BSA. The progress of protein oxidation and its inhibition
by antioxidants at physiological pH is determined from the time-dependent decrease in DPHPA fluorescence intensity. The αPROX
method was compared to other techniques frequently used to measure antioxidant capacities. In this article, representative
results are provided for the inhibitory effects of pure food components, fruit juices, wines, and various polar plant extracts
on protein oxidation.
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