New Physics

From Wiki Les Houches 09

Revision as of 13:49, 23 June 2009 by Agashe (Talk | contribs)
Jump to: navigation, search

Contents

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, Library: Hidden Sector Benchmarks (HV and Dark Matter, for both experimental reco and analysis)

11:00, QCD room: Flavour violating Higgs couplings (Kaustubh Agashe): see references/wishlist in "Talks and Links" below.

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

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

16:00 Library: Spins and Masses

Wednesday

11:00, QCD room: Flavour violating Higgs couplings (Kaustubh Agashe): see references/wishlist in "Talks and Links" below.

Thursday

10:00, Auditorium: Z_2 versus Z_3 dark matter (Geraldine Servant, Kaustubh Agashe, Seung Lee)

15:00, Library: Spins and masses

Friday


Talks and links

BSM with top:

* [1] ATLAS note on top reconstruction with substructure
* [2] ATLAS note on very high pT b-tagging
* see also the Jet Substructure page that was started in session 1.

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)
* Media:Leshouches_2009.pdf Bob McElrath's talk about polynomial methods.

Flavour-violating Higgs couplings:

  • See, for example,

http://arXiv.org/pdf/0906.1542

for a model-INDEPENDENT study of Higgs flavor violation.

Higgs flavor-violation in (warped) extra- dimensional/composite Higgs model is discussed in same reference [estimates are 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 (for M_H < m_t) is

http://arXiv.org/pdf/hep-ph/0409342 (table 4 on p.11) (see also http://arXiv.org/pdf/hep-ph/0004190 for more details).

Upon some discussion involving experimentalists and phenomenologists, it was found that (up to effects from detector simulations) this level of sensitivity sounds reasonable.

(A similar reference for H->tc - for M_H > m_t - could not be found).

  • A wish list:

(a) 1st study of LHC sensitivity for H->tc

(b) ATLAS group is undertaking a study of t->cH: can CMS be far behind?

(c) tagging charm from t-> cH (which typically dominates over t->uH), in case it is useful for rejecting some background.

(d) more precise study of LHC sensitivity for t-> cH, for example

(i) optimizing cuts to improve the sensitivity and

(ii) including intermediate M_H of ~150 GeV (say) so that H -> bb is very small and H->WW dominates (only M_H = 110, 130 GeV were studied in above references such that the dominant decay mode H->bb was used).

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, Gopalakrishna, 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?)

Personal tools