Theory SUSYProject

HEPHY Scientific Advisory Board Meeting

21st October 2010

Helmut Eberl

Theory SUSY Project

2Helmut Eberl21st October 2010

Mission statement

The SUSY project group mainly calculates processes within theMinimal Supersymmetric extension of the Standard Model of Particle Physics.

Our project concentrates on theoretical calculations toproduction and decays of MSSM SUSY particles and Higgs bosons at the LHC and a future ILC.

Theory SUSY Project

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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 reductionof the personnel budget” - Chris Fabjan

Theory SUSY Project

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Main Topicsof the SUSY project group

a possible source

Loop calculations*RenormalizationPrecision observables

CP violation in SUSY

Lepton and quark flavor violation

radiative radiative correctionscorrections

“Loop Calculations in the MSSM” – talk by H. Eberl, proceedings Corfu 09, Fortschritte der Physik, Volume 58, Issue 7-9, July 2010*

Theory SUSY Project

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Loop calculationsBuilding 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 byW. Frisch

Theory SUSY Project

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CP violationCharged 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

Theory SUSY Project

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Flavor violationQuark 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

(B – branching ratio)

Scenario 1:

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.

Theory SUSY Project

Charm-top associated production – interesting signature

Loop corrections for dominant flavour-conserving channels enhance cross-section by ~ 30% [Beenakker, Höpker, Spira, Zerwas (1997)]

Expect ~ O(104) events for “jet + top + ETmiss” production at 100 fb-1

integrated luminosity

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Theory SUSY Project

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Gravitino dark matterTwo- 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

Theory SUSY Project

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Two-body decays: Three-body decays to neutralinos:

Theory SUSY Project

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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"

Organized by the SUSY project group and B. De Monte:

Theory SUSY Project

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Thank you for your attention!