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!