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arXiv 2209.07906hep-phhep-ex
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背景BSM贡献引起的反常耦合极限的修正研究

Study of corrections for anomalous coupling limits due to the possible background BSM contributions

Artur E. Semushin, Evgeny Yu. Soldatov

摘要:

寻找反常耦合是发现标准模型偏差的可能方法之一。有效场论是用来参数化的拉格朗日与运营商的更高的维度,从SM领域构建的异常耦合。在经典的方法中,这些算子的Wilson系数的限制是基于对信号过程诱导的超出标准模型的贡献来设置的,而对背景过程诱导的贡献被假设为可以忽略不计。本文通过考虑标准模型对背景过程的贡献,对Wilson系数极限的修正进行了研究。本文以LHC ATLAS实验条件和$pp$与$\sqrt{s}=13$ TeV碰撞过程中的$Z(ν\barν)γjj$和$W(\ellν)γjj$产生为例进行了研究。考虑了在运行II期间收集的和从运行III预期的139 fb $^{-1}$和300 fb $^{-1}$的积分光度的情况。以经典方法和应用背景异常贡献校正的方法获得系数$f_\text{T0}/Λ^4$、$f_\text{T5}/Λ^4$、$f_\text{M0}/Λ^4$和$f_\text{M2}/Λ^4$的预期95% CL限值。由$Z(ν\barν)γjj$和$W(\ellν)γjj$产生的校正的一维极限分别比经典极限紧9.1%和4.4%(取决于操作者)。校正后的组合限值比经典限值更严格,最高可达3.0%(取决于操作员)。对二维边界也进行了修正,修正后的轮廓比经典轮廓更严格,最大改进为17.2%。

英文摘要:

The search of the anomalous couplings is one of the possible ways to find any deviation from the Standard Model. The effective field theory is used to parameterize the anomalous couplings in the Lagrangian with the operators of higher dimensions, constructed from the SM fields. In the classical way, the limits on the Wilson coefficients of these operators are set based on beyond the Standard Model contributions induced for signal process, whereas the ones induced for background processes are assumed to be negligible. This article provides a study of the corrections to the limits on Wilson coefficients by accounting beyond the Standard Model contributions induced for background processes. The studies of $Z(ν\barν)γjj$ and $W(\ellν)γjj$ productions in $pp$ collisions with $\sqrt{s}=13$ TeV and conditions of the ATLAS experiment at the LHC are used as example. Cases of collected during Run II and expected from Run III integrated luminosities of 139 fb$^{-1}$ and 300 fb$^{-1}$ are considered. The expected 95% CL limits on coefficients $f_\text{T0}/Λ^4$, $f_\text{T5}/Λ^4$, $f_\text{M0}/Λ^4$ and $f_\text{M2}/Λ^4$ are obtained both in classical way and in the way, where the corrections from background anomalous contributions are applied. Corrected one-dimensional limits from $Z(ν\barν)γjj$ and $W(\ellν)γjj$ productions are up to 9.1% and 4.4% (depending on operator) tighter than the classical ones respectively. Corrected combined limits are up to 3.0% (depending on operator) tighter than the classical ones. Corrections to two-dimensional limits are also obtained, corrected contours are more stringent, than the classical ones, and the maximal improvement is of 17.2%.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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