• Open Access

Search for long-lived neutral particles decaying to quark-antiquark pairs in proton-proton collisions at s=8TeV

V. Khachatryan et al. (CMS Collaboration)
Phys. Rev. D 91, 012007 – Published 20 January 2015

Abstract

A search is performed for long-lived massive neutral particles decaying to quark-antiquark pairs. The experimental signature is a distinctive topology of a pair of jets, originating at a secondary vertex. Events were collected with the CMS detector at the CERN LHC in proton-proton collisions at a center-of-mass energy of 8 TeV. The data analyzed correspond to an integrated luminosity of 18.5fb1. No significant excess is observed above standard model expectations. Upper limits at 95% confidence level are set on the production cross section of a heavy neutral scalar particle, H, in the mass range of 200 to 1000 GeV, decaying promptly into a pair of long-lived neutral X particles in the mass range of 50 to 350 GeV, each in turn decaying into a quark-antiquark pair. For X with mean proper decay lengths of 0.4 to 200 cm, the upper limits are typically 0.5200fb. The results are also interpreted in the context of an R-parity-violating supersymmetric model with long-lived neutralinos decaying into a quark-antiquark pair and a muon. For pair production of squarks that promptly decay to neutralinos with mean proper decay lengths of 240cm, the upper limits on the cross section are typically 0.53fb. The above limits are the most stringent on these channels to date.

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  • Received 24 November 2014

DOI:https://doi.org/10.1103/PhysRevD.91.012007

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2015 CERN, for the CMS Collaboration

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Vol. 91, Iss. 1 — 1 January 2015

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