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arXiv 2204.07557hep-phhep-exnucl-th
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EIC的中性流电弱物理和SMEFT研究

Neutral-Current Electroweak Physics and SMEFT Studies at the EIC

Radja Boughezal, Alexander Emmert, Tyler Kutz, Sonny Mantry, Michael Nycz, Frank Petriello, Kağan Şimşek, Daniel Wiegand, Xiaochao Zheng

摘要:

我们研究了在电子-离子对撞机(EIC)上利用中性流(NC)深度非弹性散射截面不对称性进行精确电弱(EW)测量和超越标准模型(BSM)搜索的可能性。我们的分析使用了一个完整的和现实的会计系统误差从理论和实验,并认为质子和氘束的能量和光度范围很广的潜力。我们还考虑了从未来可能的正电子束和EIC超过最初十年运行的潜在十倍光度升级中可以学到什么。我们使用SM有效场论(SMEFT)框架来参数化BSM效应并专注于半轻子四费米子算子,而对于我们的精确EW研究,我们确定EIC可以测量弱混合角的程度。我们的研究的新功能包括使用最新的检测器设计的EIC综合色动力学实验(ECCE)和准确的运行条件的EIC,光束偏振不确定性和威尔逊系数的同时拟合,以提高灵敏度SMEFT运营商,并列入弱混合角运行在我们的拟合模板。我们发现,EIC可以探测BSM运营商的规模竞争,并在许多情况下超过大型强子对撞机Drell-Yan界限,同时不遭受威尔逊系数之间的退化。

英文摘要:

We study the potential for precision electroweak (EW) measurements and beyond-the-Standard Model (BSM) searches using cross-section asymmetries in neutral-current (NC) deep inelastic scattering at the electron-ion collider (EIC). Our analysis uses a complete and realistic accounting of systematic errors from both theory and experiment and considers the potential of both proton and deuteron beams for a wide range of energies and luminosities. We also consider what can be learned from a possible future positron beam and a potential ten-fold luminosity upgrade of the EIC beyond its initial decade of running. We use the SM effective field theory (SMEFT) framework to parameterize BSM effects and focus on semi-leptonic four-fermion operators, whereas for our precision EW study, we determine how well the EIC can measure the weak mixing angle. New features of our study include the use of an up-to-date detector design of EIC Comprehensive Chromodynamics Experiment (ECCE) and accurate running conditions of the EIC, the simultaneous fitting of beam polarization uncertainties and Wilson coefficients to improve the sensitivity to SMEFT operators, and the inclusion of the weak mixing angle running in our fit template. We find that the EIC can probe BSM operators at scales competitive with and in many cases exceeding LHC Drell-Yan bounds while simultaneously not suffering from degeneracies between Wilson coefficients.

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