MadAnalysis 5 LLP (Long Lived Particle)

LLP with official Delphes 3.4.1

• Test with commented example

• Extensive test with signal regions

• Reference event

• one sample with unknown particle

LLP with special Delphes package for MA5

Delphes-LLP package is a special improvement of the Delphes package. Associated to MadAnalysis 5 v1.6, it allows the user to perform phenomenological investigations with long-lived particles or to recast existed analysis devoted to this kind of signature.

Current status: the package handles neutral LLPs which decay into leptons in the first layers of the CMS tracker (such as neutralino in the framework of RPV-SUSY).

Package[update 2017/08/25]: ​ma5track_v1.6.tgz

Changes in the Delphes dataformat:

for leptons:

• D0: impact parameter in tranverse plane wrt the closest approach point
• Z: Z-coordinate of the closest approach point

New modules in Delphes:

• MA5EfficiencyD0: applying efficiency to tracks according to the D0 parameter

Efficiency functions is coming from 8-TeV tracking performance of CMS, describing in the following wiki: ​https://twiki.cern.ch/twiki/bin/view/CMSPublic/DisplacedSusyParametrisationStudyForUser

set EfficiencyFormula { (d0<=20) * (-5.06107e-7 * d0**6 + 0.0000272756 * d0**5 - 0.00049321 * d0**4 + 0.00287189 * d0**3 + 0.00522007 * d0**2 -0.0917957 * d0 +  0.924921) +
                        (d0>20) * (0.00) }

Recast experimental analyses

Ongoing development