Run II Physics (I)

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Run II Physics (I)

• Nick Hadley
• The University of Maryland
• New Perspectives 2000
• Fermilab - June 28, 2000

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New Director redefines Run II

• Run II just continues...
• 2 fb-1 by end of 2002
• at most 9 month shutdown
• install new silicon
• 15 fb-1 (or more) by 2007
• Fermilab schedule slippage
• New schedule Fall 1999 vintage
• Data taking now begins in March 2001

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Outline

• Run II - what is it
• Brief description of Dzero Upgrade
• Top Physics
• W/Z Physics
• B Physics
• See Max Chertoks talk tomorrow for Run II (II)
• CDF Upgrades
• QCD, New Phenomena, and Higgs

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Run I ? Run II

• The Tevatron is a broad-band parton-parton
  collider

Huge statistics for precision physics at low
mass scales
Number of Events
Formerly rare processes become high
statistics processes
Increased reach for discovery physics at highest
masses
Run II
Run I
Subprocess ?s
Extend the third orthogonal axis the breadth of
our capabilities
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Run II Improvements

• New detector capabilities
• displaced vertex b-tagging
• much improved muon momentum resolution
• tracking triggers
• mass reconstruction from charged tracks
• forward proton detector
• Statistics - 100 pb-1 --gt 2 fb-1
• Huge statistics at low mass scales
• B-physics, QCD, W-mass
• Formerly rare processes enter the precision
  domain
• QCD with vector bosons, thousands of top events
• rule out or confirm unusual Run I effects
• the high-ET jet excess, the CDF ee?? event
• Increased reach at the highest mass scales
• SUSY, Higgs, quark compositeness, etc.

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Continuing strengths
Jets
Inclusive jet cross section
EM calorimetry
Missing ET
?? X
mW 80.450 ? 0.093 GeV DØ electrons
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New Tools charged particle trackingvertexing,
mass reconstruction
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In Run I only one of these three muons would
have been found!
W ? ?
b ? ?
W ? ?
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New tools heavy flavor tagging
?c
?b
55 at large pT
?u,d,s
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New tools new software and computing

• Full rewrite of online code,level 3 trigger and
  offline reconstruction in C
• 30 TB of disk faster processing

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Physics Goals of Run II

• Standard-Model Physics
• High-statistics study of the top quark (mass,
  cross section, rare decays, single top
  production)
• Precision measurement of the W mass (lt 50 MeV)
• gauge boson pair production and tri-linear
  couplings
• b-physics
• Targeted program including CP violation in B ?
  ?KS
• QCD
• Nucleon structure (parton distributions,
  diffraction)
• Jets, photons, Drell-Yan, vector bosonsjets,
  heavy flavour production
• Beyond the Standard Model
• Supersymmetry
• Higgs searches
• Technicolor, compositeness, new vector bosons,
  etc.

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B Physics

• Slides from Rick Jesik, Indiana University

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Run II B Physics Topics

• Spectroscopy
• masses, Bc
• Lifetimes
• Branching ratios
• Rare decays
• CKM measurements

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B Physics in the 21st Century

• Experiments will confront the Standard Model
  interpretation of CP violation

• A and l have been measured to a few percent
• unitarity condition

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Sin2b Expectations for 2fb-1
For a time independent analysis

• (S/B 0.75)
• e D2 6.7

But, since most of the background is at small
ts, a time dependent analysis gives reduced
error ? (sin2b ) 0.07
And this is just in the first two years - 2 fb-1.
We wont stop there...
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2002 - exciting times

• BaBar and BELLE will have results from their
  first physics runs (not at design luminosity)
• 1 - 30 fb-1 ? d(sin2b) 0.12 - 0.18
• We (and CDF) should have 1.0 - 2.0 fb-1 analyzed
• d(sin2b) 0.10 - 0.07
• Tevatron could beat the B-factories
• everyone combined could signal new physics.
• The new detector puts us in a great position to
  do significant B physics measurements in Run II,
  but we have a lot of hard work ahead of us
• getting the detector and triggers ready and
  working
• reconstruction programs for B0 ? J/y Ks 0
• But hey, look what we did in Run I without an
  inner tracker.

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Standard Model in the New Millennium

• The Standard Model works at the 10-3 level
• All observations are consistent with a single
  light SM Higgs
• mH gt 95.2 GeV (LEP) and mH lt 245 GeV (SM fit,
  Eidelman Jegerlehner)

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Conclusions

• The Tevatron is an immensely productive facility
• ?s from 3 GeV to 1 TeV
• Run II improves on Run I
• increased detector capabilities Higher rate
  capabilities, Heavy quark tagging, charged
  particle tracking, better trigger and DAQ and
  computing
• increased statistics (x20 or more) for standard
  model processes
• potential discoveries
• Great Opportunities in top, W/Z, and B Physics
• Also New Phenomena, Higgs, QCD - see tomorrows
  talk
• Please join us!