Nick Hadley Run II Physics (I) Nick Hadley The University of Maryland New Perspectives 2000 Fermilab - June 28, 2000
Jan 12, 2016
Nick Hadley
Run II Physics (I)
Nick HadleyThe University of Maryland
New Perspectives 2000 Fermilab - June 28, 2000
Nick Hadley
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
CDF
DØMI
Tevatron
Nick Hadley
Outline
• Run II - what is it
• Brief description of Dzero Upgrade
• Top Physics
• W/Z Physics
• B Physics
• See Max Chertok’s talk tomorrow for Run II (II)– CDF Upgrades– QCD, New Phenomena, and Higgs
Nick Hadley
Run I Run II
Subprocess s
Numberof
Events
Run IIRun I
Increased reach for discovery physicsat highest masses
Huge statistics for precision physicsat low mass scales
Formerly rare processesbecome high statisticsprocesses
• The Tevatron is a broad-band parton-parton collider
Extend the third orthogonal axis:the breadth of our capabilities
Nick Hadley
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 --> 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.
Nick Hadley
Continuing strengths
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Jets
Missing ET
mW = 80.450 0.093 GeVDØ electrons
EM calorimetry
+ X
Inclusive jet cross section
Nick Hadley
New Tools: charged particle trackingvertexing, mass reconstruction
Nick Hadley
b W
W In Run I only one of these three muonswould have been found!
Nick Hadley
New tools: heavy flavor tagging
b
c
u,d,s~ 55% at large pT
Nick Hadley
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
Nick Hadley
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 (< 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 bosons+jets, heavy flavour
production• Beyond the Standard Model
Supersymmetry Higgs searches Technicolor, compositeness, new vector bosons, etc.
Nick Hadley
B Physics
Slides from Rick Jesik, Indiana University
Nick Hadley
Run II B Physics Topics
• Spectroscopy– masses, Bc
• Lifetimes• Branching ratios• Rare decays• CKM measurements
Nick Hadley
B Physics in the 21st Century
• Experiments will confront the Standard Model interpretation of CP violation
tbtstd
cbcscd
ubusud
VVV
VVV
VVV
1)1(
21
)(21
23
22
32
AλiηρAλ
Aλλλ
iηρAλλλ
– A and have been measured to a few percent
– unitarity condition:
0*** udubcdcbtdtb VVVVVV
Nick Hadley
Sin2 Expectations for 2fb-1
– (S/B ~ 0.75)
– e D2 ~ 6.7 %
mode J/ J/ e+e-
trigger eff. 32 25
reco’d events 8,500 6,500
0.13 0.15sin2 0.10
SB
DNx
x
d
d
111
)2(sin2
2
For a time independent analysis:
But, since most of the background is at small t’s, a time dependent analysis gives reduced error: (sin2 ) ~ 0.07
And this is just in the first two years - 2 fb-1. We won’t stop there…...
Nick Hadley
2002 - exciting times
• BaBar and BELLE will have results from their first physics runs (not at design luminosity)– 1 - 30 fb-1 (sin2~ 0.12 - 0.18
• We (and CDF) should have 1.0 - 2.0 fb-1 analyzed (sin2~ 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 B J/s
• But hey, look what we did in Run I without an inner tracker.
Nick Hadley
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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 > 95.2 GeV (LEP) and mH < 245 GeV (SM fit, Eidelman &
Jegerlehner)
Nick Hadley
Nick Hadley
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 tomorrow’s talk
• Please join us!