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The New (g-2) Collaboration Meeting

• BNL
• 17-18 June 2004

B. Lee Roberts Department of Physics Boston
University
roberts_at_bu.edu http//physics.bu.edu/robert
s.html
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New Muon (g-2) Meeting Draft Agenda
Berkner Hall Room B Thursday June 17, 2004
830 Welcome, introduction Lee Roberts
845 Status of the Storage Ring John Benante
940 AGS Schedule for the next several
years Phil Pile 950 The Beamline - Present,
limitations Charlie Pearson 1000 The Beamline
- upgrades Paul Debevec 1050 C o f f e e
B r e a k 1115 The Inflector - present and
upgraded Wuzheng Meng 1200 Thoughts on
continuous monitoring of Kicker Yannis
Semertzidis eddy currents 1230 L u n
c h
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145 24 Bunches Woody Glenn 215 The quads,
present and future Yannis Semertzidis
300 The upgraded WFDs (for muLaN) Rob
Carey 345 Other ideas on detectors
Prisca Cushman 405 B r e a k
420 Detectors Old and New David Hertzog
515 Thoughts on DAQ Issues Prisca Cushman
530 Collaboration Governance/ Executive
Committee Jim Miller/ Lee
Roberts Friday June 18, 2004 830 The
precision Magnetic Field Ernst
Sichtermann 945 Systematic
Errors/Discussion Jim Miller/ Vanya
Logashenko 1045 C o f f e e B r e a
k 1100 Discussion of the proposal
preparation/ assignment of tasks
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Why we are here

• We feel that an improvement of at least a factor
  of 2 can be achieved at BNL,
• with reasonable cost
• and reasonable running time
• Lets look at where we came from

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Where we came from
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Today with ee- based theory
All E821 results were obtained with a blind
analysis.
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systematic errors
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In March DH,JM,LR,WM went to DOE/NSF

• We presented what we have done in E821
• We discussed the proposal to improve on aµ down
  to 0.25 ppm
• Bill Marciano gave a strong physics argument of
  why 0.25 is a well motivated goal.
• Our argument was that with modest improvements we
  could reach this goal.

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W. Marciano, _at_DOE NSF11 March 2004
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Marciano- ctd
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Comparison with CMD-2
50 45 40 35 30 25 20 15 10 5 0
CMD-2 KLOE
Fp 2
only statistical errors are shown
we have evaluated the dispersion integral for
the pp channel in the range 0.35 GeV2 lt Mpp2 lt
0.95 GeV2
ampp ( 388.7 ? 0.8stat ? 3.5syst ? 3.5theo ) ?
10-10
KLOE PRELIMINARY
Mpp2 (GeV2)
comparison with CMD-2 in the range 0.37 GeV2 lt
Mpp2 lt 0.93 GeV2
0.4 0.5 0.6 0.7
0.8 0.9 1
ampp (375.6 ? 0.8stat ? 4.9systtheo) ? 10-10
KLOE
1.3 Error
ampp (378.6 ? 2.7stat ? 2.3systtheo) ? 10-10
CMD-2
0.9 Error
Federico Nguyen
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How the plot from M. Davier et al. (2003)
modifies
including KLOE result
Federico Nguyen
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Other hadronic improvements

• BaBar is also using radiative return. The ISR
  photon is very hard. They have lots of data, but
  have to replace their muon chambers.
• Novosibirsk is upgrading the machine and the
  detector.

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Experimental Improvements

• use 5.2 p GeV beam and take backward µ decays.
• improve ?a and ?p systematic errors to 0.1 ppm.
• open the inflector ends.
• improve the kicker?

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present beamline
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Inflector
gain 1.75 for open ends
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kicker
we never saw this efficiency turn over. can we
improve the storage rate by an additional kicker?
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detectors/electroincs

• can we improve the detectors?
• or use the Q method?
• New electronics
• muLaN electronics

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Welcome to each of you

• We have many challenges to deal with to reach the
  new goal.

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