Theory SUSY
Project
Helmut Eberl
HEPHY Scientific Advisory Board Meeting
21st October 2010
Theory SUSY Project
Mission statement
The SUSY project group mainly calculates processes within the
Minimal Supersymmetric extension of the Standard Model of Particle Physics.
Our project concentrates on theoretical calculations to
production and decays of MSSM SUSY particles and Higgs bosons
at the LHC and a future ILC.
21st October 2010
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Theory SUSY Project
List of Members 2010
 H. Eberl – Project leader
 E. Ginina - Postdoc (1 Sep 08 – 31 August 10, HEPTOOLS ER)
 S. Frank – PhD student (1 March 09 –
28 Feb 11)
 H. Hlucha - PhD student (1 Oct 07 – 31 May 09, HEPTOOLS ESR, - 30 Nov 10 30 April 11 ? )
 W. Frisch - PhD student (1 Nov 07 – 30 June 11)
 W. Majerotto - Emeritus (retired Dec 07, but still active)
Call for a new position in the SUSY project group was in preparation,
but now – “The cards are re-shuffled, because of a severe reduction
of the personnel budget” - Chris Fabjan
21st October 2010
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Theory SUSY Project
Main Topics
of the SUSY project group
Loop calculations*
Renormalization
Precision observables
CP violation in SUSY
radiative
corrections
a possible
source
Lepton and quark flavor violation
*
21st October 2010
“Loop Calculations in the MSSM” – talk by H. Eberl, proceedings Corfu 09,
Fortschritte der Physik, Volume 58, Issue 7-9, July 2010
Helmut Eberl
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Theory SUSY Project
Loop calculations
Building of numerical packages of SUSY partner and Higgs boson decay
programs within the SPA convention with LHA input and output
Full one-loop branching ratios of
 Charginos, neutralinos:
Bernhard Schrausser finished his PhD Thesis in June 10,
“Decays of Charginos and Neutralinos in the MSSM”
– to be translated to DRbar scheme
 Higgs bosons – W. Frisch, package HFOLD (Higgs Full One-Loop Decays)
finished, on the web: http://www.hephy.at/tools/
 Sfermions – H. Hlucha, package SFOLD to be finished
HFOLD and SFOLD were presented at Loops and Legs 2010 in Wörlitz/Germany by H. E. –
online proceedings already available
HFOLD was presented at Tools 10 in Southampton/England and SUSY 10 in Bonn/Germany by
W. Frisch
21st October 2010
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Theory SUSY Project
CP violation
Charged Higgs production and further decays at LHC,
comparison CTHDM with MSSM
(A. Arhrib, E. Christova, H. E., E. Ginina)
meeting in Vienna in September 10
 FeynArts model file for the Complex Two Higgs Doublet model written for
most general case
 FormCalc fortran drivers written
 CPV rate asymmetries automatically calculated for
and
subsequent decays
and
 Publication soon
 Implementation of CTHM in next upgrade release of FeynArts/FormCalc
Stop decays to chargino and bottom - work with S. Frank, W. Majerotto,
arXiv:0912.4675, to be published in EPJC
21st October 2010
Helmut Eberl
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Theory SUSY Project
Flavor violation
Quark flavor violation at LHC – international collaboration –
A. Bartl, H. E., B. Herrmann, K. Hidaka, W. Majerotto, and W. Porod
 Squark prod. + decays at LHC finished, arXiv:1007.5483 – sent to JHEP
 Gluino three-body decays – new project – group meeting in Vienna in
August 10, E. Ginina joined this group
arXiv:1007.5483: Impact of squark generation mixing on the search for
squarks decaying into fermions at LHC
The flavour-violating terms are incorporated in the 6x6 mass matrix, e.g.
Scenario 1:
(B – branching ratio)
21st October 2010
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Theory SUSY Project
Charm-top associated production – interesting signature
Expect ~ O(104) events for “jet + top + ETmiss” production at 100 fb-1 integrated
luminosity
Loop corrections for dominant flavour-conserving channels enhance cross-section by ~ 30%
[Beenakker, Höpker, Spira, Zerwas (1997)]
21st October 2010
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Theory SUSY Project
Gravitino dark matter
Two- and three-body decays – project with V. Spanos, Demokritos, Athens




FeynArts model file (78 add. couplings) written
Lorentz structure file for spin 3/2 particle developed
In FormCalc spin 3/2 particle included for automatic fortran code generation
Fortran program gravwidth.F finished, all two body decay widths checked with
analytic formulas, three-body decay widths for
also included and compared with known analytic
results.
Next steps:
 Inclusion of LHA in/output format
 Physics discussion - publication
 Extension to
and
 Inclusion into next version of FeynArts/FormCalc
21st October 2010
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Theory SUSY Project
Two-body decays:
21st October 2010
Three-body decays to neutralinos:
Helmut Eberl
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Theory SUSY Project
Organized by the SUSY project group and B. De Monte:
3rd HEPTOOLS Annual Meeting 2009
30th November – 1st December 2009
in Vienna
~ 60 participants, talks given by W. Frisch and E. Ginina
on 29th Nov. node coordinator meeting
Public talk by M. Mangano (CERN) :
“The quest for the fundamental laws of nature"
21st October 2010
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Theory SUSY Project
Thank you for your attention!
21st October 2010
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