Hidden Thresholds: A Technique for Reconstructing New Physics Masses at Hadron Colliders

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dc.creatorHuang, P.
dc.creatorKersting, N.
dc.creatorYang, H. H.
dc.date2008-01-31
dc.date2008-05-22
dc.date.accessioned2026-07-07T09:40:04Z
dc.date.available2026-07-07T09:40:04Z
dc.descriptionWe present an improved method of reconstructing New Physics (NP) masses from invariant mass endpoints. While the traditional method focuses on a single NP decay, our method considers the decays of two or more NP particles ($ABC...$) in a grander decay chain: $ anything \to ABC... \to ... \to jets + leptons$. Though the center-of-mass energy $E_{CM}$ of `anything' varies unpredictably at a hadron collider, a sample of many events nonetheless expresses features of threshold production $E_{CM} = m_A + m_B + ...$: invariant masses constructed from the final jet and lepton momenta are correlated in a way that makes their threshold endpoints visually obvious in a scatterplot. We illustrate this technique for the production of two neutralinos in the MSSM: $anything \to \widetildeχ_{i}^0 \widetildeχ_{j}^0$ ($i,j=2,3,4$) which subsequently decay via on- or off-shell sleptons to four leptons. Assuming the relevant SUSY spectrum is below $1 TeV$ and squarks/gluinos eventually decay to neutralinos, our MC study shows that one low-luminosity year at the LHC ($10-30 fb^{-1}$) can quantitatively determine on- versus off-shell decays and find the relevant neutralino and slepton masses to less than 10 percent.
dc.description15 pages, 6 figures; Discussion simplified
dc.identifierhttps://arxiv.org/abs/0802.0022
dc.identifierhttp://arxiv.org/abs/0802.0022
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/161372
dc.subjectHigh Energy Physics - Phenomenology
dc.titleHidden Thresholds: A Technique for Reconstructing New Physics Masses at Hadron Colliders
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