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LHC2FC WG1 (Higgs)

Convenors:
  • Sally Dawson             <dawson(at)quark.phy.bnl.gov>
  • Sven Heinemeyer      <Sven.Heinemeyer(at)cern.ch>
  • Chiara Mariotti           <Chiara.Mariotti(at)cern.ch>
  • Markus Schumacher <Markus.Schumacher(at)physik.uni-freiburg.de>

The main questions:

We assume that the LHC will collect 10/fb of understood data.
What are
- the physics goals and prospects for the upcoming years
- the physics goals beyond an LHC upgrade? What would be the best future collider to achieve these goals?


Scenarios under consideration:

There are three possible scenarios we could consider:
within the first 10 fb^-1 of understood data we find evidence for a
particle compabible with
A: a "really" SM-like Higgs, i.e. with MH = 130 ... 180 GeV
A': like A, but we find also something else
B: a SM-like Higgs outside this mass range
B': like B, but we find also something else
C: a non-SM-like Higgs
   -> this might be possible due to some unusual BR(H -> bb, WW(*), ...)?
C': like C, but we find also something else


Time table for the workshop activities:
(meetings, locations, speakers/discussion leaders, ...)
Note: all official talks and discussions are broadcasted via EVO (Universe community, "LHC2FC").
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09.02. (Mon): 14.00h - 14.30h: kick-off talk (plenary) to explain the working group ideas, open questions, structure, etc.
10.02. (Tue):  16.30h - 17.30h: parallel meeting:
                                             1) general discussion about working group goals (convenors)
                                             2) focus discussion #1: Scenario A/A': where/how can we search for deviations from the SM?
                                                                                Discussion leader: Herbi Dreiner
11.02. (Wed):10.00h - 12.00h: plenary meeting:
                                             1) talk #1: What can we learn about Higgs with 10/fb at the LHC
                                                             Speaker: Ketevi Assamagan
                                             2) talk #2: What are the prospects for the Higgs at Hadron Colliders
                                                             (LHC with 300/fb, SLHC, DLHC, VLHC)?
                                                             Speaker: Marco Pieri
                    16.30h - 17.30h: WG3/WG1 discussion meeting: Fittino results for early LHC data vs. LHC high-luminosity data vs. ILC
                                                                                           Speaker: Philip Bechtle
12.02. (Thu): 16.30h - 17.30h: parallel meeting:
                                            1) focus discussion #2: Scenario B/B': where/how can we search for deviations from the SM?
                                                                                                    What does M_H tell us?
                                                                               Discussion leader: Sally Dawson
13.02. (Fri): afternoon: possibly short meeting (discussion on open questions, progress)
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16.02. (Mon):
10.00h - 12.00h: plenary meeting:
                                             1) talk #3: What are the prospects for the Higgs at Lepton Colliders (ILC, CLIC, gamma gamma, mu mu)?
                                                             Speaker: Klaus Moenig
                                             2) talk #4:
CPV: what can be learnt at future colliders? What is it good for?
                                                             Speaker: Rohini Godbole
                    16.30h - 17.30h: extra parallel meeting: focus discussion #3
17.02. (Tue): 15.30h - 16.20h: parallel meeting:
                                            focus discussion
#4: - What could the effective Lagrangian for the Higgs sector look like?
                                                                           - What does more luminosity (longer LHC running) do for us?
                                                                           - What would the SLHC or future colliders buy us?
                                                                           - Where are Higgs sector analyses limited?
                                                                           Discussion leader: Tilman Plehn
18.02. (Wed):17.30h - 18.30h (or open end): parallel meeting:
                                           
focus discussion #5:Scenario C/C': where/how can we search for deviations from the SM?
                                                                           Discussion leader: Shrihari Gopalakrishna

19.02. (Thu): afternoon: possibly short meeting (discussion on open questions, progress)
20.02. (Fri):  afternoon: possibly short meeting (discussion on open questions, progress)
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23.02. (Mon):
10.00h - 12.00h: plenary meeting:
                                             1) talk #5:
Lepton Collider theory:what would the experimental precision be good for?
                                                             Speaker: Sven Heinemeyer
                                             2) talk #6: Hadron Collider theory: what would the experimental precision be good for?
                                                             Speaker: Laura Reina
                    16.30h - 18.30h: parallel meeting:
                                            1) focus discussion #6:
Input from precision observables (LHC/ILC/GigaZ) to the Higgs sector
                                                                               Discussion leader: Wolfgang Hollik

                                            2) focus discussion #7:
Higgs masses, couplings: what can measured? Where?
                                                                               How much model dependence enters?
                                                                               What are "optimal observables"?
                                                                               Discussion leader: Sven Heinemeyer
24.02. (Tue): afternoon: possibly short meeting (discussion on open questions, progress
25.02. (Wed): 16.30h - 18.30h: parallel meeting:
                                            1) focus discussion #8: 
Topic: ?
                                                                               Discussion leader: Marcela Carena

                                            2) focus discussion #9: What can we learn from the LHC with 200/pb?
                                                                               Discussion leader: Andrey Korytov
26.02. (Thu): afternoon: possibly short meeting (discussion on open questions, progress)
27.02. (Fri): 10.00h - 11.00h: possibly discussion on: C/C' (extension of discussion on 18.02.):
                                   How exactly could we detect a deviation with 10 fb^-1?
                                   How does the deviation from the SM tell us where/how to search at future colliders?

                 14.00h - 14.xxh: working group summary (plenary)
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Material from the meetings can be found here.

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Questions to be discussed:

There are three possible scenarios we could consider:
within the first 10 fb^-1 of understood data we find evidence for a
particle compabible with
A: a "really" SM-like Higgs, i.e. with MH = 130 ... 180 GeV
A': like A, but we find also something else
B: a SM-like Higgs outside this mass range
B': like B, but we find also something else
C: a non-SM-like Higgs
   -> this might be possible due to some unusual BR(H -> bb, WW(*), ...)?
C': like C, but we find also something else

Case A/A':
* What should we do? Where/how should we look for non-SM signals?
  -> possible TALK on this?
(Should we neglect A'?)

Case B:
* How could we search for deviations from the SM in the Higgs sector?
  What does MH tell us?
  -> possible TALK on this?

Case B':
* How is this different from B? Possible other signals? (-> not our group?)
(Should we neglect B'?)


Case C:
* Can the deviations from the SM tell us where/what to search?
  -> possible TALK on this?

Case C':
* What assumptions can we make? What are the respective prospects?
  -> possible TALK on this?


What we probably want to measure in any case:
* Higgs mass down to O(200 MeV)
* Higgs couplings to SM particles
Where can this be done best? Dependence on the MH, on the case, ...?
-> possible TALK on this?

What one could possibly also measure:
* couplings to new particles
* Higgs self-couplings
* spin
* quantum numbers
When are these "additional" measurements (really) relevant?
-> possible TALK on this?

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Subpages (2): emails WG1 write-up