# Presentation: 403847

## Trigger rates

**Trigger rates**

**D******

**CDF**

- Both experiments can comfortably accomodate high Pt physics

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##  Physics Goals

***W/Z***** bosons**: *W* mass to < 50 MeV; *WW*,*WWZ*,*ZZ* and *ZZ* couplings at 0.1 level (large mass scales) ; *W* and *Z* forward backward charge asymmetries

**New Phenomena**: SUSY will still need experimental verification in 1999++, leptoquarks, many topics

**Light Higgs**:  production *WH* , *H**bb*
-                                                    ( need lum !!)

**B physics**: *B**s* mixing (*x**s*20); study of heavy *b* quark mesons (*B**c**,B**s*,b), CP violating di-lepton and *Bd**J*/*K**s*; Rare *B* decays ( *Bd*, *Bd**K* etc)

**QCD physics**: probe largest Et with jets, production of *W/Z*,, *b*-quarks

**New for D0**

-  **Physics Goals**

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## Physics with top quark

- s** 1.8 ******** TeV****: ****top cross section goes up ~40%**
**b tagging efficiency  ****(soft lepton +displaced vertex) ~ 80%**
**Expected event yields**
**Channel****	****     RunII (2 fb****-1****)        S:B**
**dilepton****	****                            200****	****             5:1**
**lepton+********4jets****	****              1 800****	****	**
**lepton+ ********3jets/b-tag       1400****	****             3:1**
**lepton+ ********jets/b-b tag      600****	****           12:1**
**Single top****	****                 330****	****            1:2**
**Main studies: ****Measure  m****top**** to ******** 3GeV;   single top production: width, ********V****tb********0.1 *****unique*****; rare top decays {B(*****t**********c*********)< 2  10****-3****  B(*****t**********cZ*****) < 10****-2****  B(*****t**********H*****+*****b*****)<15%**** **

## Electroweak physics

**Expected event yields:**
**Channel                          RunI ****	****    RunII**
**                                        ****(100 pb-1)        (2fb-1)**
**W********e********                                 60k****	****      1.6M**
**Z********ee                                     6k               160k**
**W********                                          50                   1k**
**Z********k**
**WW,WZ,ZZ********leptons      a few                150**
**Main studies: ****W mass to ******** ****40 MeV/c****2 ****;**** ********(W)**** **(**from M****T**** shape to 1.5%)**
** **W W ,W W Z,Z Z  and ZZ** **couplings limits x2 improvements** **
- W charge asymmetry (PDF’s)
- Forward-backward Z charge asymmetry ((sin2W) = 0.001)

##  W Mass Measurement

**Statistical uncertainty ********20 MeV/c****2**
**Systematic scaled as 1/********N**
**Theoretical “brick wall” at 20 MeV/c****2****,**
**pdf uncertainty reduced by *****W***** asymmetry measurements**
** ****Expect *********M******W***** ********MeV/c****2****, ****comparable to LEP**
** *********M******W***** ********MeV/c****2**** ****possible for Run III  ****unless new systematic “brick wall” exists**

- P. Tipton

## Higgs Mass Sensitivity

**In the Standard Model,***** M******W***** and *****M******top***** provide indirect measurement of *****M******Higgs***
**Combining CDF and DØ results will yield *********M******Higgs***** ********40% *****M******Higgs *****after Run II**

## B Physics

**	****Constraining the CKM matrix:**
**> 10,000 reconstructed B****0 ********J/********K****s**** and 1000 B****s ****decays**
- Observation of CP violation in B0 J/Ks (sin 2to 0.10 - 0.15)
- Observation of CP violation in B0 +- (CDF only, sin 2 to 0.10)
- Measurement of Bs  mixing (xs reach to ~20)
- B lifetimes and spectroscopy (Bc, etc.)
- Observation of rare B decays (B

## Search for New Phenomena

**Desperately seeking SUSY**
**Best signals include:**
**Charginos in trilepton final state **
**Gluinos in missing *****E******T***** + jets**
**Mass reach: **
***M************* ********220 GeV/c****2**** **
** *****M******gluino***** ********400 GeV/c****2**
**Searches for exotics**
**W******** and Z********, leptoquarks, technicolor, contact interactions, excited quarks, charged Higgs from top**,**...**
**Mass reach:**** **
- extended by a factor of 1.5 over Run I

## New Physics Reach

## QCD

**> 5000 events with jet E****T** **> 300 GeV and extend jet E****T** **to ~500 GeV**
**Main studies**
- Inclusive jet cross section
- Direct photon cross section
- W/Z production cross sections
- Provides** **information** **on PDF’s
- Also tests NLO and NNLO QCD
- search for new physics (quark substructure, technirho, ...) in Inclusive jet cross section at high ET and dijet invariant mass cross section
- Rapidity gaps, diffractive processes, Pomeron structure

## TeV33 :Main physics goal

**Light Higgs search (80<m****h****<130 GeV/c****2**** )**
- out of reach of  run II, difficult at LHC (accessible only via H->)
- best hope at Tevatron qqbar->WH, H->bb (use jet-jet spectroscopy and b-tagging)
**for MH=80 GeV, 10 fb-1 yields 60 events, and S/B=1/5.8**
- would need to upgrade the present run II upgrades in order to trigger and record data at 2E33
**W mass to 20 MeV/c****2****? **
**top mass to 1 GeV/c****2****?**

## Light Higgs Search

**Tevatron experiments have sensitivity to Higgs with mass 60********125 GeV/c****2**
**Covers difficult window in *****M******Higgs *****at LHC**
**Best channel is *****qq**********WH*****, *****H**********bb***
**Other modes (*****ZH*****, *****H*********) help confirm**

- With 20 fb, obtain
- 5 excess for
*M**Higgs ** *125 GeV/c2

*WH* signal and backgrounds for 5 fb-1

## Slide 13

## The Tev33 project

**Goal: ****	*********L***** *****dt***** ********10-30 fb****-1**
**Timescale:**
**Run II: 2000-?********L*****dt***** ********2 fb******
**Shutdown for upgrade of machine and detectors**
**Run III: ?-2007 ********L*****dt***** ******** 30 fb******
**Begin R&D in 2000 **** ******** 3 yrs for R&D, contruct, intall**

**Factor**
**of 2.5**
**worth **
**it?**

## Tev33

**Physics**
**At the energy frontier **
**“****Compelling”: spelled out by tev2000 study group****top, searches (susy, higgs, technicolor), high E****T**** jets, M****W****...)**
***dL/dt***** ******** 1 ********10****33**** cm******** s******
**DØ and CDF detectors can do the job ****IF**
**do not die**
**can trigger**
**Upgrade of the detectors under study**

## The Tevatron after 2000

- s = 1.8 TeV
- 19221996
- Peak *L* = 1.6 1032 cm s
- *L* *dt* .12fb
- Run II
- s = 2.0 TeV
- 		30% in  for top, searches...
- 2000?
- Peak *L* = 2 1032 cm s
- *L* *dt* 2 to 4fb
- Run III
- Shutdown one year, run for 3 years
- Capable of peak *L* = 1 1033 cm s
- Run “luminosity leveled” at *N* = 5constant *L* = 5 1032 cm s
- *L* *dt*  20 fb
**Two upgraded detectors: CDF and DØ**

**The Tevatron after 2000**

## Summary

**The energy frontier will remain at the Tevatron until middle of next decade**
**A rich program of physics for Run II & III **
**Fully exploited by the upgraded CDF and DØ detectors**
**Many precision measurements will provide stringent tests of the SM**
**Good chances for discovery of new physics or severely constrain extensions beyond the SM**
**complementary to physics program @ LEP, HERA, B factories**
**First results at Moriond 2001 ?**

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