تقرير
A reappraisal of constraints on $Z'$ models from unitarity and direct searches at the LHC
| العنوان: | A reappraisal of constraints on $Z'$ models from unitarity and direct searches at the LHC |
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| المؤلفون: | Bandyopadhyay, Triparno, Bhattacharyya, Gautam, Das, Dipankar, Raychaudhuri, Amitava |
| المصدر: | Phys. Rev. D 98, 035027 (2018) |
| سنة النشر: | 2018 |
| المجموعة: | High Energy Physics - Experiment High Energy Physics - Phenomenology |
| مصطلحات موضوعية: | High Energy Physics - Phenomenology, High Energy Physics - Experiment |
| الوصف: | In a truly model-independent approach, we reexamine a minimal extension of the Standard Model (SM) through the introduction of an additional $U(1)$ symmetry leading to a new neutral gauge boson ($Z'$), allowing its kinetic mixing with the hypercharge gauge boson. An SM neutral scalar is used to spontaneously break this extra symmetry leading to the mass of the $Z'$. Except for three right-handed neutrinos no other fermions are added. We use the current LHC Drell-Yan data to put model-independent constraints in the parameter space of three quantities, namely, $M_{Z'}$, the $Z$-$Z'$ mixing angle ($\alpha_z$) and the extra $U(1)$ effective gauge coupling ($g'_x$), which absorb all model dependence. We impose additional constraints from unitarity and low energy neutrino-electron scattering. However, limits extracted from direct searches turn out to be most stringent. We obtain $M_{Z'} > 4.4$ TeV and $|\alpha_z| < 0.001$ at $95\%$ C.L., when the strength of the additional $U(1)$ gauge coupling is the same as that of the SM $SU(2)_L$. Comment: v3: Minor updates. Version accepted for publication in PRD |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevD.98.035027 |
| URL الوصول: | http://arxiv.org/abs/1803.07989 |
| رقم الأكسشن: | edsarx.1803.07989 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevD.98.035027 |
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