New Physics

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New Physics at the LHC

The New Physics part will meet at Les Houches during the period 17-26 June 2009, but people should form an idea of the studies they would like to pursue before that. All work should be completed by the end of 2009. The preference will be for studies focused on recent developments in new physics possibilities.

Schedule

Thursday

15:00 Auditorium: BSM with top, incl. jet structure

Friday

9:00 Auditorium: Dark matter & colliders, hidden sectors/valleys

Matt Strassler: Intro to Hidden Valleys Image:Strassler.LesHouches.pdf

David Morrissey: Dark Matter in Dark Sectors and "Lepton Jets"

Jay Wacker: Composite Dark Matter, DAMA, and "Lepton Jets" Image:Wacker.LesHouches.pdf

Yuri Gershtein: D0 Results on Searches for SUSY inspired "Lepton Jets"

16:00 Library: Hidden Valley Monte Carlo Discussion

16:30 QCD room: Boosted W and Z

Saturday

11:00 Auditorium: Dictionaries mapping signatures to models

14:00 Library: Long-Lived Particles

16:30 Library: spin/mass determination

yyyy: Dirac gauginos, R-symmetry, and new signals of SUSY (Adam Martin).

Sunday

Monday

9:00, Auditorium: Delphes Tutorial

11:00, Library: From signatures to models: follow-up.

11:30, QCD room: Flavour violating Higgs couplings (Kaustubh Agashe).

14:00, QCD room: Dirac gauginos and new SUSY signals (Adam Martin).

14:00, Library: Boosted W & Z

15:00, Auditorium: Dark Matter from Extra Dimensions at the LHC (Giacomo Cacciapaglia)

16:00, Library: Spins and Masses

16:30, QCD room: (CONTINUED from 14:00 meeting in Library) Pairs of boosted hadronic W/Z from decay of resonances (Kaustubh Agashe)

18:00 QCD room: Long-lived stuff (including D0 experimental techniques)

Tuesday

11:00, QCD room: Flavour violating Higgs couplings (Kaustubh Agashe): see references below.

14:00, QCD room: Use of polarized tops (Ritesh Singh).

15:00, QCD room: Four top events (Ben Gripaios).

Wednesday

Thursday

Friday

Talks and links

BSM with top:

* [1] ATLAS note on top reconstruction with substructure
* [2] ATLAS note on very high pT b-tagging

SUSY blind analysis project:

* [3] Webpage with description & first results.

Data Reporting:

* [4] Talk by Kyle Cranmer regarding publishing Likelihood maps for discoveries electronically using the RooStats package.

Mass Determination:

* [5] WIMPMASS code (polynomial system solver for cascade decays with 2 missing particles)

Flavour-violating Higgs couplings:

  • The Higgs flavor violation in (warped) extra- dimensional/composite Higgs model is discussed in

http://arXiv.org/pdf/0906.1542

[estimates given in abstract are BR (t->cH) ~ 10^(-4) and BR(H->tc) ~ 5 x 10^(-3)]

and

http://arXiv.org/pdf/0906.1990 (for more detailed numbers)

[Note that the "radion" (scalar particle corresponding to fluctuations of size of extra dimension) also decays to tc (very similarly to Higgs): see

http://arXiv.org/pdf/0812.2489]

  • The THEORY reference which claims LHC sensitivity of 5 x 10^(-5) for t->cH

(optimistic?) is

http://arXiv.org/pdf/hep-ph/0409342 (table 4 on p.11)

(I could not find a similar reference for H->tc).

  • A wish list: more precise (experimental?) study of LHC sensitivity for t-> cH and 1st study of LHC sensitivity for H->tc

Work Topics & Wish Lists

Boosted W/Z:

Theorists' wish list:

  • Efficiency & background rejection for boosted Z to ee, mumu, bb; W and Z to qq (non-bb); what is the jet mass resolution vs jet pT for merged jets from color singlet objects?
  • Can we identify something like u' -> Wu, W->e/mu nu? (MET will be aligned with lepton/jet, use collinear approx & W mass to constrain fake MET?)

Experimenters' wish list:

  • Exhaustive list of models producing boosted W and Z bosons (organized by other objects in the event), with x-section ranges.

Long-Lived Particles:

"If it can be short-lived, it can often also be long-lived"

Experimenter's wish list:

  • Monte Carlo generators

Spin and Mass Reconstruction:

  • With current mass methods developed for SUSY, what do you get for non-SUSY? (Tommaso)
  • Comparisons of mass methods and where they work/fail (Bob)
  • What about off-shell particles? (Juergen/Ritesh)

From Signature to Model:



NB:

From the information given during the registration process, the following "groups of interest" were identified:


   -Extra dimensions: Agashe, Boos, Bunichev, Cacciapaglia, Deandrea, Fichet, Fox, 
    Gopalakrishna, Grojean, Harper, Henderson, Karagoz Unel, Kraml, Lee, Llodra-Perez, 
    Mahmoudi, Moreau, Morrissey, Przysiezniak, Rosenfeld?, Servant, Singh, Wacker.
   -Technicolor & other EWSB: Agashe, Black, Bose, Boudjema, Del Debbio, Gripaios, 
    Grojean, Harper, Lane, Maravin, Martin, Reuter, Rosenfeld, Servant, Shepherd, Wacker.
   -Z': Basso, Harper, Jackson, Reuter, Singh, Shepherd.
   -BSM through top: Agashe, Boos, Boudjema, Brooijmans, Gray, Gripaios, Grojean,   Guchait,Karagoz 
    Unel, Lee, Lessard, (Raklev), Servant, Shepherd, Singh, Tytgat, Vos, Wacker.
   -Hidden Valley: long-lived particles: Basso, Gershtein, Maravin, Morrissey , Strassler, Tomalin.
   -Hidden Valley: multiparticle production (benchmarks and backgrounds): Strassler.
   -Dark matter and colliders: Agashe, Belanger, Boudjema, Fox, Gopalakrishna, Guchait,Kraml, 
    Kribs, Lee, LLodra-Perez, Mahmoudi, Martin, Morrissey, Pukhov, Robens, Roy, Raklev, Sekmen, Shepherd, Strassler.
   -Dictionary of signatures & model-independent searches: Belyaev, Bruneliere, Das, 
    Datta, Del Debbio, Fichet, Fox, Gopalakrishna, Henderson, Kauer, Kraml, Lari, Reuter, Robens, Roy, Sekmen, 
    Shepherd, Tytgat.
   -Spin/mass determination: Boudjema, Datta, Gripaios, Lester, Mahmoudi, 
    McElrath, Reuter, Robens, Singh.
   -SUSY Pheno: Fichet, Kraml, Lari, Mahmoudi, Martin, Morrissey, Reuter, Robens, Roy, Slavich, Spira.
   -Tools: Basso, Belyaev, Boos, Bruneliere, Bunichev, Cacciapaglia, Das, Datta, 
    Del Debbio, Kraml, Mahmoudi, Przysiezniak, Pukhov, Reuter, Richardson, Semenov, Slavich, 
    Spira, Strassler.



(Before registration, we had listed some possibilities:

   - Hidden valleys (and other models with long-lived particles)
   - New physics decaying to top quarks
   - Exotic quarks
   - 4th family (mirror or sequential)
   - LHC-dark matter: LHC signals related to hints from PAMELA, ATTIC, DAMA

Furthermore, it would be interesting to further develop guidelines for follow-ups after a potential discovery: if we see X then what should we look for?)

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