Extra Dimensions and Compositeness in μ + μ -

Extra Dimensions and Compositeness in μ+μ-

Dimitri BourilkovUniversity of Florida

Florida Contribution to Physics TDR

SUSY/BSM Review, CMS Week, September 2004, CERN, Geneva

D.Bourilkov ED & Compositeness in μ+μ- 2

Contact Interactions, ED etc.general framework for new int.:•scale s (virtual effects)

or resonances if s •coupling g (convention g2 = 4)•we constrain g / •operators with canonical dimension N > 4 coupling 1/MN-4

•|ij| < 1 helicity amplitudes


Scales for New Physics

• Extra dimensions from e+e- and γγ LEP combined (DB): MHewett > 1.4 (1.2) TeV (=1); D0 2004 ~ 1.5(1.4) TeV

• Contact interactions LEP: scales up to 19 TeV (leptons) or 13 TeV (hadrons – bb)

• Z’ LEP: m > 0.434 – 1.787 TeV (diff. models) TEVATRON: m >~ 800 GeV• Size of the electron: re < 1.4 10-19 m LEP quark: r < ~10-18 m HERA, r < 5.6 10-19 m CDF 1997• From the LHC/LC workshop: LHC – contact

interactions (LL) up to 30 – 50 TeV

LHC / LC workshophep-ph/0305125


High-mass Muon Pairs

• PYTHIA, HERWIG; use of C++ generators for ED under study

• TeV muons:Simulate with GEANT4/OSCAR:

> Bremsstrahlung, e+e- pair production, muon-nucleus interactions (showering), punch-through etc.

FAMOS for TeV muons?> Will need it to cover the large parameter space of scales,

masses, couplings etc. (full simulation for the background and selected scales for the signals)

ORCA Reconstruction (collaborate with UCLA, Dubna, Warsaw …)

• Main background: Drell-Yan μ+μ- and +-

(collaborate with SM group); other: WW, cc, bb, tt, fakes, cosmics …


LHC is a Di-lepton Factory“SM (and more) at the LHC” hep-ph/0003275 and CMS-IN-2000/035; M.Dittmar hep-ex/9606002


Drell-Yan at High Mass


PDF Uncertainties• LHAGLUE v3 integrated in LHAPDF v3

(D.Bourilkov, C.Group, M.Whalley; hep-ph/0305126 )Free download from: durpdg.dur.ac.uk/lhapdf/

• PYTHIA, HERWIG or stand-alone mode• Rich in new: CTEQ6, MRST, Fermi, Alekhin,

Botje, ZEUS2002, H12000 and legacy: CTEQ4, CTEQ5, MRST98, GRV98 PDF sets; successor of PDFLIB

• Typical PDF uncertainties on xsec < 5 %• Included in CMKIN_3_2_0 (DB, Veikko Karimaki,

Sergey Slabospitsky)


High-mass Di-lepton Background

• To control the DY background we need both N(N)LO and EW radiative corrections

• Plan to investigate MC @ NLO• TEV4LHC workshop: no generator today able

to do decently both QCD and EW (follow the developments)Side remark: maybe we need a LEP4LHC

workshop to collect the accumulated knowledge about MC tuning, hadronization, CR etc. !

• DY common for many searches in e+e- μ+μ- +-


Estimates for DC04

+-/qq background from 70-120 GeVTO mass 70-120 GeV 20-70 GeV+- 0.8 % 8.1 %qq (no isol) 0.3 % 1.5 %


Expected Results for Physics TDR

• Mass and efficiency plots for signal/bg• Mass resolution for signal/bg• Angular distributions, AFB and spin determination

for signal/bg• Discovery reach as function of luminosity for

compositeness and ED (ADD, RS)• Systematic effects @ LHC start-up (inclusion and priority

after PRS discussions) : most important / difficult partDetector: alignment, calibration, staging, trigger configurationTheory: PDF uncertainties, NLO effects, EW corrections

• Background from data? Z peak, M < 300-400 GeV


People from Florida

• Dimitri Bourilkov, Bockjoo Kim• Muon consultants: Darin Acosta et al.• PDF uncertainties: Dimitri Bourilkov, Craig

Group• Theory consultants: Konstantin Matchev,

Rick Field


Outlook

• High-mass di-leptons are a rich search field for new physics

• Many things in common for e+e- μ+μ- +- :Drell-Yan background (collaborate with SM group,

TEV4LHC, LHAPDF)Simulation/Reconstruction of TeV muons (several

searches will use them)• Understanding the most important systematic

effects affecting the discovery reach at LHC start-up and how to control them

Extra Dimensions and Compositeness in μ + μ -

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