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非对易标准模型中$e^{-}e^{+} \to γγ$的反常三规范玻色子耦合

Anomalous Triple Gauge Boson Couplings in $e^{-}e^{+} \to γγ$ for Non Commutative Standard Model

N. G. Deshpande, Sumit K. Garg

备注：
17 pages, 12 figures. Matched with version published in Phys. Lett.B. New references added. Some calculational details and plots which are omitted in this version can be found in its previous arXiv version. arXiv admin note: text overlap with arXiv:1105.5203
发表信息：
Physics Letters B 708 (2012) 150-156
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摘要：

在Seiberg-Witten扩展非对易标准模型（NCSM）中研究了反常三规范玻色子耦合下的$e^{+}e^{-}\to γγ$过程.这项研究是在有和没有初始光束偏振的情况下进行的，我们将自己限制在非对易性即$O(Θ)$的领先阶效应上。非对易（NC）修正对NC参数的电分量（$\vecΘ_E$）敏感。我们在分析中考虑了地球自转的影响。这项研究是通过调查不同的时间平均截面观测值的非交换性的影响。我们还定义了前向后不对称性，这将是唯一敏感的异常耦合。我们已经在国际直线对撞机（ILC）的未来实验中研究了这些耦合的灵敏度。该分析是在实际的ILC条件下进行的，质心能量（c.m.）$\sqrt{s}=800$ GeV和积分光度L= 500 fb ${}^{-1}$。假设非对易性的尺度为$Λ= 1$ TeV。当没有超过SM的信号出现时，从前后不对称性得到了$10^{-1}$阶反常耦合的极限，而从总截面得到了$10^{-2}$阶反常耦合的更严格的极限.

英文摘要：

We investigate $e^{+}e^{-}\to γγ$ process within the Seiberg-Witten expanded noncommutative standard model(NCSM) scenario in the presence of anomalous triple gauge boson couplings. This study is done with and without initial beam polarization and we restrict ourselves to leading order effects of non commutativity i.e. $O(Θ)$. The non commutative(NC) corrections are sensitive to the electric component($\vecΘ_E$) of NC parameter. We include the effects of earth rotation in our analysis. This study is done by investigating the effects of non commutativity on different time averaged cross section observables. We have also defined forward backward asymmetries which will be exclusively sensitive to anomalous couplings. We have looked into the sensitivity of these couplings at future experiments at the International Linear Collider(ILC). This analysis is done under realistic ILC conditions with the Center of mass energy(c.m.) $\sqrt{s}=800$GeV and integrated luminosity L=500fb${}^{-1}$. The scale of non commutativity is assumed to be $Λ= 1$TeV. The limits on anomalous couplings of the order $10^{-1}$ from forward backward asymmetries while much stringent limits of the order $10^{-2}$ from total cross section are obtained if no signal beyond SM is seen.

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