+
Explored and
Unexplored MSSM
Signatures
Sam Bein, Florida State University
1
Goals
make robust, comprehensive statements about SUSY
guide the next generation of searches
parameter estimation in case of discovery
CMS PAS SUS-13-020
Phenomenological MSSM interpretation of
the CMS 7 and 8 TeV results
2
Samuel Bein, CMS (Florida State University)
The Challenge
MSSM
Hypotheses the LHC
can test
3
Samuel Bein, CMS (Florida State University)
The Phenomenological (p)MSSM
MSSM
119 parameters
pMSSM
19 parameters
Hypotheses the LHC
can test
4
Samuel Bein, CMS (Florida State University)
The Phenomenological (p)MSSM
A realization of the R-parity conserving MSSM with
*no new sources of CP violation
*no flavor changing neutral currents
*1st and 2nd generation squarks are degenerate
*lightest SUSY particle is the neutralino
19 Parameters
Gaugino mass parameters M1 , M2 , and M3
Higgs sector parameters tan( ), µ, and mA
10 sfermion mass parameters mi
Trilinear couplings At , Ab , and A5 ⌧
Samuel Bein, CMS (Florida State University)
CMS SUSY Analyses
Combined CMS SUSY searches:
• 7 hadronic
• 4 leptonic
Posterior Density
p(✓|Data
CM S
) / L(Data
6
CM S
|✓)⇧(✓)
Samuel Bein, CMS (Florida State University)
Results
7
Samuel Bein, CMS (Florida State University)
Gluino
posterior
prior
8
Samuel Bein, CMS (Florida State University)
LSP
posterior
prior
9
Samuel Bein, CMS (Florida State University)
LSP vs Gluino
prior
posterior
10
posterior/prior
Samuel Bein, CMS (Florida State University)
Non-excluded parameter space
Out of 7195 studied pMSSM points:
• 3,516 points have been excluded by direct CMS SUSY
searches
over 50% of the nonexcluded points have a total
production cross section
greater than 10 fb.
11
Samuel Bein, CMS (Florida State University)
Expanding the sensitivity of CMS
to the non-excluded pMSSM
In collaboration with Hongxuan Liu, Alexx Perloff, Zhenbin
Wu, and Arka Santra, and others
Baylor University
Texas, A and M
Univ. Illinois Chicago Florida State University
Thanks to the LPC for hosting this collaboration!
12
Samuel Bein, CMS (Florida State University)
Dominant pair
production mode
•
•
High Cross
section
Non-excluded
13
Samuel Bein, CMS (Florida State University)
Expanding the sensitivity of CMS
to the non-excluded pMSSM
/ T”
Analysis: “Jets + HT + H
(aka RA2) had a very large
impact on the pMSSM
Key contributors based at the LPC
14
Samuel Bein, CMS (Florida State University)
Expanding Sensitivity
˜
±
˜l/˜
⌫
t̃/b̃
˜
ũ/d
15
Samuel Bein, CMS (Florida State University)
Conclusion
•
•
•
•
we have investigated the impact of a set of 7 and 8
TeV SUSY searches on the pMSSM
gluino masses below 500 GeV are excluded
low mass LSPs cannot be ruled out
the non-excluded pMSSM will guide future CMS SUSY
searches. This work is made possible by the LPC.
CMS PAS SUS-13-020
Phenomenological MSSM interpretation of
the CMS 7 and 8 TeV results
Samuel Bein, CMS (Florida State University)
Backup
17
Samuel Bein, CMS (Florida State University)
CMS SUSY Analyses
18
Samuel Bein, CMS (Florida State University)
Non-excluded parameter space
Convenient re-mapping of the Bayes factor:
Bayes factor: B10 = L(Data|H1 )/L(Data|H0 )
Z-signficiance:
Z > -1.64 (non-excluded)
Z <= -1.64 (excluded)
19
Samuel Bein, CMS (Florida State University)