Discussion%20on%20the%20SUSY%20Les%20Houches%20Accord%202%20project

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Discussion on the SUSY Les Houches Accord 2
project
Flavour in the Era of the LHC, CERN, MAy 15-17
2006

• P. Skands

RPV, CPV, FLV, NMSSM, THEORY ERRORS, CROSS
SECTIONS, GENERAL BSM RESONANCES,
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Outline

• SLHA1 brief overview
• SLHA2
• SUSY CONVENTIONS HOW TO GENERALISE?
• Model definition
• MSSM w/ Flavour Violation
• MSSM w/ R-parity Violation
• MSSM w/ CP Violation (?)
• NMSSM (?)
• CROSS SECTIONS AND THEORY ERRORS
• OTHER EXTENSIONS
• Well-defined mixing Matrices
• General BSM Resonances - QNUMBERS

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SUSY Les Houches Accord v1
? ? ? ?
? ? ? ? ? ?
? ? ? ? ? ?
? ? ? ?
? ? ? ? ?
?
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F77 I/O Library by T. Hahn (now also SLHA2)
FITTERS
?
?
FITTINO, SFITTER
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Example SLHA Spectrum
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How to Generalise? MSSM

• Superpotential (at scale Q (normally MGUT) in
  DRbar)

RPV CPV FLV
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How to Generalise? Model Definition

• Additions to global switches in block MODSEL

• Choice of particle content
• 0 MSSM (default)
• 1 NMSSM
• R-parity violation
• 0 R-parity conserved (default)
• 1 R-parity violated
• CP violation
• 0 CP conserved (default)
• 1 CP violated but only by CKM phase
• 2 CP violated, general phases allowed
• Flavour violation
• 0 No (SUSY) flavour violation (default)
• 1 Flavour violated

NB Yes. There was some mention of an MFV
option, but not clear how useful it would be.
(MFV would not affect the general mixing
structure etc, all mixings would still be
generated radiatively)
Q Is this adequate?
NB For SLHA2 we are keeping RPV, CPV, and FLV
separate
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How to Generalise? FLV

• SUPER-CKM BASIS
• defined as basis in which quark Yukawas, in
  DRbar, are diagonal
• NB lepton mixing not treated yet (though see
  RPV).
• INPUT
• VCKMIN VCKM in PDG parametrisation (SM MSbar at
  MZ).
• SMINPUTS Include mu,d,s(2GeV)MSbar and
  mc(mc)MSbar
• NB no explicit proposal yet for input of
  non-diagonal soft SUSY-breaking trilinear and
  bilinear terms, e.g. MSQ2IN, MSU2IN, MSD2IN?
• LAGRANGIAN PARAMETERS (all DRbar at scale Q)
• Yukawas Super-CKM basis ? always diagonal (but
  same blocks as SLHA1)
• VCKM and bilinear SUSY-breaking MSQ2, MSU2, MSD2
  matrices
• Matrices are symmetric Give only iltj entries of
  Mij?
• Or entire matrix i j ? (ij already in EXTPAR ?
  inconsistencies?)
• Hermiticity ? MSQ2(i,j)MSQ2(j,i) ? keep these
  matrices real?

NB Not addressed
see next (Jaume)
NB No comments. What Jaume is doing is fine. Of
course, I can always make my code able to deal
with ij if I like.
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How to Generalise? FLV

• EW SCALE MIXING
• USQMIX 6x6 up-squark mixing in super-CKM basis
• DSQMIX 6x6 down-squark mixing in super-CKM basis
• Problem which quark is which? Enumeration of
  mass eigenstates.

• (from Jaume) Particle codes we have taken the
  following convention squarks ordered in growing
  mass, the PDG codes for squarks are used

FCHDECAY fchdecay.googlepages.com
Main Issue PDG (no-mixing limit)
Down squarks PDG code 1000001 d_1 1000003
d_2 1000005 d_3 2000001 d_4 2000003 d_5 2000005
d_6
Up squarks PDG Code 1000002 u_1 1000004
u_2 1000006 u_3 2000002 u_4 2000004 u_5 2000006
u_6
NB Yes
1000002 u_L 1000004 c_L 1000006 t_1 2000002 u_R 20
00004 c_R 2000006 t_2
1000001 d_L 1000003 s_L 1000005 b_1 2000001 d_R 20
00003 s_R 2000005 b_2
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How to Generalise? RPV

• INPUT
• New input blocks for all RPV superpotential
  parameters, soft-breaking parameters, and
  sneutrino vevs (prefix RV and suffix IN)
• LAGRANGIAN PARAMETERS (DRbar at scale Q)
• New output blocks for all RPV parameters (prefix
  RV)
• POLE MASSES
• new sneutrinos
• 1000017, 1000018,1000019
• EW SCALE MIXING
• RVNMIX 7x7 neutralino/neutrino
• RVHMIX 5x5 CP-even H/sneutrino
• RVAMIX 5x5 CP-odd H/sneutrino
• RVLMIX 8x8 Charged H/slepton
• RVUMIX, RVVMIX 5x5 chargino/lepton

NB Inputs not independent, due to constraints
from EWSB. 5 conditions instead of normal 2. In
MSSM, choice between (mh1,mh2) or (mu,mA). Here
what to do? One possibility rotate to basis
where sneutrino vevs disappear. Give usual
parameters. Other possibilities? Allow freedom?
Werner and me to make explicit proposal.
example
NB Include Golstones
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How to Generalise? RPV

• Mixing Example Charged colour-singlet fermions

Flavour basis e e flavour eigenstate mu
mu -- tau tau -- -i w charged wino
h2 charged higgsino (up-type)
Mass basis (PDG numbers), strictly
mass-ordered -11 (e) lightest state
(regardless of composition!) -13 (mu) 2nd
lightest -15 (tau) 3rd
lightest 1000027 (chi1) 1000037 (chi2)
heaviest charged colour-singlet fermion
NB OK
NB currently using U,V mixing etc for each
sector separately and not Super-MNS for
leptons/Higgses. Need to discuss?
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How to Generalise? CPV

• SIMPLEST WAY
• Add prefix IM to already existing SLHA1 blocks
• E.g. in input IMEXTPAR in output IMNMIX etc
• Not completely general, but useful starting point
• MORE GENERAL
• Add prefix IM to new SLHA2 blocks (supersede
  SLHA1 if present)
• EW SCALE MIXING
• CVHMIX 4x4 neutral Higgs (CP-even CP-odd)
  mixing
• IMCVHMIX imaginary parts
• Charged Higgs mixing (2x2) not yet agreed upon

NB Mixing is real! No IMCVHMIX (only for
zon-zero width)
NB Yes. Include Goldstones. In principle their
composition is specified by theory, but can be
hard to calculate, so why not?
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How to Generalise? NMSSM
Cf. NMHDecay, Ellwanger, Gunion, Hugonie

• Superpotential (at scale Q (normally MGUT) in
  DRbar)
• (usually with µMSSM0)

NMSSM
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Cross Sections Theory ErrorsNB Not included
in current LH status report

• Theory Errors
• Introduce (unphysical) input variables
  corresponding to variations within theoretical
  uncertainty -gt range of spectra. (Similar in
  spririt to error PDF's)
• Calculation of observables from spectrum ? /-
  errors on computed variables
• Cross Sections used by fit programs
• Templated in SPheno. Collecting experiences now.

NB No explicit progress at this time
Fittino, Sfitter
These (and more?) to be included in journal
writeup
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Including (possibility for) well-defined mixing
matrices

• In SLHA1, exact definition of mixing matrices was
  left up to RGE program (since the only thing we
  could agree on was not to agree )
• Read the individual manual
• DRbar at some scale m? (m2SUSY mt1mt2, m (mh
  mH)/2, )
• On-shell ?
• Etc
• Not a huge problem
• DRbar Lagrangian parameters also given
• ? can always construct desired mixing structure
• Still, would be nice to have possibility for
  exact definition
• Include option for giving DRbar mixing matrices
  at scale Q

NB Not clear what this will be useful for. Sven
argues that no use for DRbar definition of alpha.
People should speak up, or possibility will be
thrown away.
e.g. BLOCK NMIX Q or BLOCK DRNMIX
Q BLOCK NMIXDR Q
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MC4BSM Workshop
Monte Carlo Tools for Beyond-the-Standard-Model
Physics. March 20-21 2006. Fermilab

• MC4BSM first workshop to focus explicitly on
  tools for non-SUSY BSM
• Survey what is available communication
  feedback
• Identify promising models and start to fill up
  the gaps
• Streamlining the process of going from models to
  events

• One question that came up
• Successive resonance decays of general new
  physics resonances?
• Can be done with SLHA decay tables, just add
  basic information about particle
• ? Proposal for SLHA2. BLOCK QNUMBERS (or
  PARTICLE?)

BLOCK QNUMBERS 1234567 new_guy PDG1234567
1 0 3 times electric charge 2 2
number of spin states (2S1) 3 1
colour rep (1 singlet, 3 triplet, 8 octet)
4 0 Particle/Antiparticle distinction
(0own anti) BLOCK MASS Mass Spectrum
1234567 3.1415926535E02 new_guy DECAY
1234567 1.000000E00 new_guy width
1.0000E-00 2 22 22 Br(new_guy -gt
gamma gamma)
NB essentially no comment

• (? Already used to interface CalcHEP, NMHDecay,
  and PYTHIA, for the NMSSM)

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Outlook

• Conceptual Design Report for SLHA2 in Les
  Houches BSM Proceedings, hep-ph/0602198 concerns
  core SLHA2 conventions.
• More extensive writeup to follow in 2006. To
  discuss
• Flavour in the Era of the LHC, CERN, May 15-17,
  2006 (flavour)
• Tools 2006, Annecy, Jun 26-28, 2006
• MC4LHC, CERN, Jul 17-26, 2006
• MC4BSM, Gainesville, FL, Winter 06/07
• See also Les Houches BSM tools repository
  http//www.ippp.dur.ac.uk/montecarlo/BSM

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Work 1
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Work 2
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Work 3
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Conclusions
Tough conditions call for good tools! We will be
ready for NMSSM, CPV, RPV, FLV,
Then all we need is a signal
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MC4BSM Workshop
Monte Carlo Tools for Beyond-the-Standard-Model
Physics. March 20-21 2006. Fermilab

• Many new models of New Physics emerged over last
  few years
• e.g. Extra Dimensions, new technicolor-like
  models, Higgsless, Little Higgs, gauge and/or
  matter extensions to MSSM, ...
• Many of these imply qualitatively new
  phenomenological signatures
• The rest imply a possible experimental confusion
  with existing models

• MSSM has been useful benchmark scenario to test
  experimental and phenomenological strategies for
  a long time
• Now increasing focus on non-MSSM signatures
  how we could get confused
• Many advanced tools exist to study all aspects of
  MSSM phenomenology in detail (dark matter,
  electroweak precision, cross sections, decay
  widths, NLO, spin correllations, event
  generators, ) most use SUSY Les Houches Accord
  (now being extended to CPV, RPV, FLV, NMSSM)
• For non-MSSM BSM much fewer / less sophisticated
  tools

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The SLHA1 Conventions

• Experimental boundary conditions
• SM gauge couplings and Yukawas (measured)
• ? MSSM couplings and Yukawas (not the same,
  since different field content ? different quantum
  corrections)

• Superpotential (at scale Q (normally MGUT) in
  DRbar)

• SUSY Breaking Terms (at scale Q in DRbar)