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--- 2013:groups:higgs:start [2013/06/05 13:52]
suzanne.gasconshotkin
+++ 2013:groups:higgs:start [2013/06/20 12:32]
roberto.contino
@@ Line 1: / Line 1: @@
 ====== Higgs Working Group======
-==== Some topics for Session 1 ====
+===== Some topics for Session 1 =====
 a)       PDF uncertainties for gluon-gluon fusion
@@ Line 24: / Line 24: @@
 g)      H -> 2gamma (signal and background)
+**[[2013:groups:sm:higgs:photons|Photons]]**
-Photon topics:
+**[[2013:groups:sm:higgs:hdijets|Higgs+dijets (ggF) uncertainty study]]**
-. Measurements:  gg, gg + jet, gg + 2jets
---All processes:Try for some calculation including direct and fragmentation contributions in as high orders as possible (something equivalent to joining of
-gammaNNLO and DIPHOX/Gamma2MC) In what areas in phase space is 'missing' (meaning wrt 2gammaNNLO) fragmentation important?  What is the relationship with asymmetric
-pt cuts? Pertinence to ATLAS recent results and CMS results in progress, theory-data agreement in low DeltaPhi region for example
---gamma gamma + jet: Try GoSam gamma gamma + 1 jet + MG compared to SHERPA/aMC@NLO/POWHEG/ALPGEN/MG/PYTHIA (codes producing hadronised events) Is there a way to 'map' kinematic effects from fragmentation to experimental level (as we do today running for example PYTHIA with and without UE to correct results from the partonic codes for UE today), so as to be able to correct/extrapolate from purely partonic codes?
+===== Topics for Session 2 =====
-. Understanding finely the background to the H125 or X125 (or 126!)
---Make 2d reweighting of LO/LO+ codes used for prompt diphoton irreducible backgrounds to 2gammaNNLO(+gamma2MC)
---Make 2d reweightings of  LO/LO+ codes used for photon + jet and jet-jet (pure QCD) backgrounds to DIPHOX in gamma-h and h-h modes
-(above are for training of multivariate methods in Hgg analysis)
---An obstacle to the use of physics motivated truth models from partonic/hadron-level calculations for background modelling in Hgg is the 'sculpting' of distributions at the experimental level by acceptance/other selection criteria not possible to model  at parton- or hadron-level, can we work on techniques for these extrapolations?
+==== Concrete projects ====
---Precise measurements of the different background components (gamma-gamma, gamma-jet, jet-jet) *in the nbd of the H125/6*
+) [[2013:groups:higgs:hel|Higgs Effective Lagrangian (HEL)]]
+  * Constraints on EWK Effective Operators from LEP1&2 (incl. TGC), LHC
+  * Map operators to experimental observables
+  * Dipole operators (top)
+  * Implementation of Effective Lagrangian in POWHEG for single Higgs production
-. Isolation
+) [[2013:groups:higgs:ehd|Exotic Higgs Decays]]
---For or against trying to use or at least evaluating Frixione isolation on experimental level? Other cones?
---Use in Vgamma
---Prior LH studies, which Frixione parameters are the best
---Same as usual question of surviving collinear (to photon) radiation
-. Hgg signal/background
+  * Classify possible exotic Higgs decays
---Propagate new knowledge on the gg-ggf background-signal interference (Martin,Dixon et al) to the exps. signal modelling (mass shifts..)
+  * Check existing constraints on the couplings mediating exotic decays
---Investigate new possible observables for greater S/B sensitivity (using knowledge from 2. above)
+  * Prompt experimental searches for the motivated decays that are not being searched for by experiments
+) [[2013:groups:higgs:dihiggs|Double Higgs Production]]
+  * Study feasibility of double Higgs production via VBF at the LHC and future colliders
+) {{2013:groups:higgs:accuracy.pdf|Higgs Couplings and BSM Physics}}
+) [[2013:groups:higgs:stat|Theoretical uncertainties in the global Higgs fits]]
+==== Topics that were discussed during the Les Houches workshop ====
-==== Some topics for Session 2 ====
-a) Higgs Effective Lagrangian (HEL)
+a1) Higgs Effective Lagrangian (HEL)
     * implementation of HEL in MC generators (ex: gg->h, h->4f)
@@ Line 72: / Line 70: @@
     * updated and complete analysis of current constraints from Higgs, flavor and precision data on the coefficients of HEL
     * estimate of future sensitivity of the LHC on the coefficients of HEL
+a2) [[2013:groups:higgs:tgc|Triple Gauge Couplings (TGC)]]
+Interplay of triple gauge couplings and Higgs measurements in the effective Lagrangian.
 b) Identify most promising Higgs observables and processes to discover New Physics, given the current constraints and exclusion limits:
@@ Line 82: / Line 85: @@
 e) effects of NP on Higgs BR's, using existing contraints (SUSY was done during last Les Houches)
+f) [[2013:groups:higgs:naturalness|Naturalness:]]
+g) Exotic Higgs Decays
+h) Theoretical uncertainties in the global Higgs fits
+i) Constraints on "other" Higgses in multi-Higgs models and ways how to look for them at LHC (including heavy Higgs --> hh decays, where h is the 125 GeV state).

Les Houches

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