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Pair-produced heavy particle topologies: MSSM neutralino properties at the LHC from gluino / squark cascade decays

Pair-produced heavy particle topologies: MSSM neutralino properties at the LHC from gluino / squark cascade decays
Pair-produced heavy particle topologies: MSSM neutralino properties at the LHC from gluino / squark cascade decays
Processes of the form pp -> anything -> XiXj -> + + notE are studied via a technique that may be viewed as an adaptation of time-honoured Dalitz plot analyses. Xi and Xj are new heavy states (with i, j =1, . . .,n), which may be identical or distinct; and and are necessarily distinct standard model (SM) fermion pairs whose invariant masses can be measured. A Dalitz-like plot of said invariant masses, versus , exhibits a topology connected to the masses and specific decay chains of Xi and Xj. Aside from relatively minor details, observed patterns consist of a collection of box and wedge shapes. This collection is model-dependent: comparison of the observed pattern to the possibilities for a specific model yields information on which new particle pair combinations are actually being produced, information beyond that extractable from conventional one-dimensional invariant mass distributions. The technique is illustrated via application to the minimal supersymmetric standard model (MSSM) process pp -> -> e+e- + ?+?- notE. Here the heavy states are neutralinos (i = 2,3,4) - note that is excluded - which are produced in gluino/squark ( / ) cascade decay chains. Even with fairly modest expectations for the LHC performance during the first few years, this method still provides substantial insight into the neutralino mass spectrum and couplings if gluino/squark masses are relatively low (? 400 GeV).
1434-6044
477-492
Bisset, M.
9821bb62-6af3-4c74-80b4-c5fcda5099ea
Kersting, N.
44f9e365-b1fd-46b7-938f-5c0150557722
Li, J.
c01989cb-c2a9-41ed-9e23-0618c53a3e85
Moortgat, F.
03460f83-c228-4b8b-afe7-a2121ba34505
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
Xie, Q.L.
3f1c366e-9cda-4ba9-b968-127fb3977839
Bisset, M.
9821bb62-6af3-4c74-80b4-c5fcda5099ea
Kersting, N.
44f9e365-b1fd-46b7-938f-5c0150557722
Li, J.
c01989cb-c2a9-41ed-9e23-0618c53a3e85
Moortgat, F.
03460f83-c228-4b8b-afe7-a2121ba34505
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
Xie, Q.L.
3f1c366e-9cda-4ba9-b968-127fb3977839

Bisset, M., Kersting, N., Li, J., Moortgat, F., Moretti, S. and Xie, Q.L. (2006) Pair-produced heavy particle topologies: MSSM neutralino properties at the LHC from gluino / squark cascade decays. The European Physical Journal C, 45, 477-492. (doi:10.1140/epjc/s2005-02433-4).

Record type: Article

Abstract

Processes of the form pp -> anything -> XiXj -> + + notE are studied via a technique that may be viewed as an adaptation of time-honoured Dalitz plot analyses. Xi and Xj are new heavy states (with i, j =1, . . .,n), which may be identical or distinct; and and are necessarily distinct standard model (SM) fermion pairs whose invariant masses can be measured. A Dalitz-like plot of said invariant masses, versus , exhibits a topology connected to the masses and specific decay chains of Xi and Xj. Aside from relatively minor details, observed patterns consist of a collection of box and wedge shapes. This collection is model-dependent: comparison of the observed pattern to the possibilities for a specific model yields information on which new particle pair combinations are actually being produced, information beyond that extractable from conventional one-dimensional invariant mass distributions. The technique is illustrated via application to the minimal supersymmetric standard model (MSSM) process pp -> -> e+e- + ?+?- notE. Here the heavy states are neutralinos (i = 2,3,4) - note that is excluded - which are produced in gluino/squark ( / ) cascade decay chains. Even with fairly modest expectations for the LHC performance during the first few years, this method still provides substantial insight into the neutralino mass spectrum and couplings if gluino/squark masses are relatively low (? 400 GeV).

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More information

Submitted date: 3 March 2005
Published date: 2006

Identifiers

Local EPrints ID: 57088
URI: https://eprints.soton.ac.uk/id/eprint/57088
ISSN: 1434-6044
PURE UUID: 1581bc21-1c55-4227-9b0c-41b6261ca164

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Date deposited: 15 Aug 2008
Last modified: 13 Mar 2019 20:34

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