1 status report skands/slha
Post on 21-Jan-2016
216 Views
Preview:
TRANSCRIPT
1
Status Report
http://home.fnal.gov/~skands/slha
2
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.
3
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
4
Example SLHA Spectrum
5
How to Generalise? MSSM
2. Superpotential (at scale Q (normally MGUT) in DRbar)
RPVCPVFLV
3. SUSY Breaking Terms (at scale Q in DRbar)
6
• 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
7
• 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
8
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.
9
• 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
10
• 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
11
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?
12
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
13
• 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
top related