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Status Report

http://home.fnal.gov/~skands/slha

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SLHA – Considerations

• Consistency– Define parameters consistently and

unambiguously specific conventions adopted (described in detail in writeup)

• Flexible/Extendable

– Structure should be general enough to handle any model files built of modular data “blocks”

• Usable

– Easy to implement and use Keep basic structure simple.

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SUSY Les Houches Accord v1

+ F77 I/O Library by T. Hahn (now also SLHA2)

SUSY MODEL

MSSMSUGRAGMSBAMSBNMSSMRPVCPVFLV…

CPSUPERHFEYNHIGGSISASUSYNMHDECAYSOFTSUSYSPHENOSUSPECT…

SPECTRUM CALCULATOR

CALCHEPCOMPHEPILCSLEPTONGRACE

HERWIG (++ )

ISAJETPROSPINOPYTHIASHERPASMADGRAPHSUSYGENWHIZARD…

MC EVENT GEN /XS CALCULATOR

MICRΩSDARKSUSYNEUTDRIVERPLATON (?)

CDM PACKAGE

DECAY PACKAGE

FEYNHIGGS FCHDECAY HDECAY NMHDECAY SDECAY SPHENO

spectrum

spc+decspc

input

spectrum

FITTINO, SFITTERFITTERS

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Example SLHA Spectrum

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How to Generalise? MSSM

2. Superpotential (at scale Q (normally MGUT) in DRbar)

RPVCPVFLV

3. SUSY Breaking Terms (at scale Q in DRbar)

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• Using Super CKM/MNS basis (at floating scale)– Quark and lepton Yukawas diagonal

• 6x6 squark / slepton mixing

• Complete conventions for input parameters (VCKM, fermion masses, soft terms, …) + conventions for output spectrum

Flavour Violation

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• EW SCALE MIXING:– USQMIX: 6x6 up-squark mixing in super-CKM basis– DSQMIX: 6x6 down-squark mixing in super-CKM basis

• Problem: SLHA uses the PDG particle enumeration scheme, but need generalisation for MSSM. Which quark is which? Enumeration of mass eigenstates.

Flavour Violation

Down squarks:PDG code

1000001 d_11000003 d_21000005 d_32000001 d_42000003 d_52000005 d_6

Up squarks:PDG Code

1000002 u_11000004 u_21000006 u_32000002 u_42000004 u_52000006 u_6

Main Issue:PDG (no-mixing limit):

1000002u_L

1000004c_L

1000006t_1

2000002u_R

2000004c_R

2000006t_2

1000001d_L

1000003s_L

1000005b_1

2000001d_R

2000003s_R

2000005b_2

FCHDECAY fchdecay.googlepages.com

– NB: PDG are open to suggestions

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RPV

The bilinear terms and the VEVs are not independent. Related by the condition of EWSB. In SLHA1, one had the possibility either to specify m2

H1 and m2H2 or μ and m2

A.

This carries over to the RPV case, where not all the parameters in the input blocks RPV...IN can be given simultaneously.

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• Q: One or Many? – Specify field content one NMSSM (e.g. dimensionality of

mixing matrices always same)

– Qualitatively different models w/ different superpotentials etc (?) many NMSSM? (nMSSM, NMSSM, MNMSSM, …)

NMSSM

• SLHA2: general NMSSM with all terms allowed by supersymmetry and gauge invariance –Each variant corresponds to some terms (non-)zero.

–In general: any term not given explicitly assumed zero

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• Theory uncertainties, cross sections etc, will be left out in the interest of finalizing the agreements soon– This does not prevent / preclude private

agreements!

• All SUSY parameters will be given in DRbar

MISCELLANEOUS

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Note on General BSM Resonances• Non-SUSY BSM:

– Specialised tools beginning to emerge

– Important to have full-fledged event generators• Qualitatively different collider phenomenologies

• Model confusion

– Extensive discussions at MC4BSM (FNAL, March 20-21 2006)

• Summary of discussions available on spires (f t mc4bsm)

PYTHIA and CalcHEP now use SLHA-like blockBLOCK QNUMBERS 1234567 # new_guy PDG=1234567 1 0 # 3 times electric charge 2 2 # number of spin states (2S+1) 3 1 # colour rep (1: singlet, 3: triplet, 8: octet) 4 0 # Particle/Antiparticle distinction (0=own anti)BLOCK MASS # Mass Spectrum 1234567 3.1415926535E+02 # new_guyDECAY 1234567 1.000000E+00 # new_guy width 1.0000E-00 2 22 22 # Br(new_guy -> gamma gamma)

• Or something a la definition of a particle in CompHEP / Madgraph model file?

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Outlook

• ‘Conceptual Design Report’ for SLHA2 in 2005 Les Houches BSM Proceedings, hep-ph/0602198 by now obsolete

• Les Houches 2007 preliminary writeup:

• Submit to archives as soon as lepton mixing included (scope: 1 month)

• See also Les Houches BSM tools repository: http://www.ippp.dur.ac.uk/montecarlo/BSM

http://home.fnal.gov/~skands/slha

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• 14:00 SLHA2 status report (20’)• 14:20 Introduction round and brainstorm

– Who is who, tools – Definition of Projects

• Improving the BSM interface Madgraph/PYTHIA (Someone from CompHEP, Gigg, Herquet, Hubisz, Pukhov, Skands, Su)

• …

• 15:15 General Tools Discussion– Experimental Needs, Model files, Feedback, …– More projects?– …

Agenda