تقرير
On-shell constrained $M_2$ variables with applications to mass measurements and topology disambiguation
| العنوان: | On-shell constrained $M_2$ variables with applications to mass measurements and topology disambiguation |
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| المؤلفون: | Cho, Won Sang, Gainer, James S., Kim, Doojin, Matchev, Konstantin T., Moortgat, Filip, Pape, Luc, Park, Myeonghun |
| المصدر: | JHEP 1408 (2014) 070 |
| سنة النشر: | 2014 |
| المجموعة: | High Energy Physics - Experiment High Energy Physics - Phenomenology |
| مصطلحات موضوعية: | High Energy Physics - Phenomenology, High Energy Physics - Experiment |
| الوصف: | We consider a class of on-shell constrained mass variables that are 3+1 dimensional generalizations of the Cambridge $M_{T2}$ variable and that automatically incorporate various assumptions about the underlying event topology. The presence of additional on-shell constraints causes their kinematic distributions to exhibit sharper endpoints than the usual $M_{T2}$ distribution. We study the mathematical properties of these new variables, e.g., the uniqueness of the solution selected by the minimization over the invisible particle 4-momenta. We then use this solution to reconstruct the masses of various particles along the decay chain. We propose several tests for validating the assumed event topology in missing energy events from new physics. The tests are able to determine: 1) whether the decays in the event are two-body or three-body, 2) if the decay is two-body, whether the intermediate resonances in the two decay chains are the same, and 3) the exact sequence in which the visible particles are emitted from each decay chain. Comment: 44pages, 17 figures. revised version, published in JHEP. Minor addition: a paragraph discussing the effect on the background at the end of section 5.1 |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1007/JHEP08(2014)070 |
| URL الوصول: | http://arxiv.org/abs/1401.1449 |
| رقم الأكسشن: | edsarx.1401.1449 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1007/JHEP08(2014)070 |
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