# Presentation: 786414

##   Physics Results from Tevatron Run II

- Daria Zieminska
- Indiana University
- mail to: _[daria@fnal.gov](mailto:daria@fnal.gov)_
- (for the D0 and CDF Collaborations)
- Lattice  2004
- Fermilab, June 26, 2004

## Tevatron  Run II   rich physics  program

**Tevatron  Run II   ****rich physics  program**

** ****EW physics : W, Z’s  have large cross sections ******** high statistics; precision measurements**
** **- W, Z masses, width,, W helicity
-  - Gauge boson pair production
** ****Top ********, mass, properties, single top**
** ****Higgs searches**
** ****Precision QCD measurements**
** ****Diffractive phenomena**
** ****New physics searches : SUSY, **
**  ****Extra Dimensions etc**
** ****B and Charm physics**
**  ****- **1010 b-quarks produced per 100 pb-1

## Contents

- Top quark mass & implications for SM Higgs
- SM Higgs limits
- Production cross sections
- New states ( X(3872), pentaquarks )
- B physics results
- 	- spectroscopy
- 	- lifetimes
- 	- towards Bs mixing
- 	- rare decays ( Bs,d   limits )

## Tevatron Performance

**Tevatron Performance**

-  **Tevatron has been working **
**   ****well in 2004**
-  Record initial luminosity =
-             = 7.8 x 1031 cm-2 sec-1
-  Recent data taking rate:
**            ****~**10 pb-1 / week
-  **~ 0.4 fb****-1** on tape per experiment
-  ~ 100–270 pb-1 used for analysis
-  CDF & D0 performing well
-  Data taking efficiency ~80–90%

## Detectors

- Silicon microvertex tracker
- Axial solenoid
- Central tracking
- High rate trigger/DAQ
- Calorimeters and muons

**CDF**
- L1 Fast Track Trigger
- L2 trigger on impact parameter
- (pT)/pT = 0.002pT
- Particle ID (TOF and dE/dx)
**DØ**
- Muon ID;   || < 2
- Tracking acceptance || < 2-3
- L2 IP trigger   being commissioned

**Detectors**

## Top Quark Mass Measurements

- D0: New analysis of Run I Data    Nature 429, 638 (2004)

** **Rather than a kinematic fit, the probability for a top  (or background) event to give rise to observed jets, leptons and MET is computed
-  Also define background probability for each event
-  Mt   measured by maximizing Poisson likelihood for entire event sample
-  Advantages
-   - all jet permutations contribute
-   - additional kinematic information used
-   - event-by-event resolutions considered
-   - non-Gaussian detector response accounted for
-  Compromises
-   - only leading-order tt cross section is used
-      only events with exactly four jets can be used
-   - gluon fusion diagrams neglected
-   - only background process computed is W + jets

-         22 events including 10 background
- Mt  = 180.1 ± 3.6 (*stat*) ± 4.0 (*syst*) GeV

## Top Quark Mass Measurements

**Top Quark Mass Measurements**

- CDF: Analyses of Run II data

**(1) Analysis a la  Run I**

**(2) Dynamic Likelihood Method**
***Similar to new D0 analysis***

- D0 Run II Mt  results  soon

## New Mt  Implication for SM Higgs Mass

**New M****t****  Implication for SM Higgs Mass**

** ****Old:**
** ****─****  ****M****t**** = 174 ****± 5.1 GeV**
** ─  ****M****H**** =  96****+60****-38 ****GeV **
** ─  ****M****H**** < 219 GeV (95% cl)**
** ****New:**** **
** ****─  ****M****t ****=  178 ± 4.3 GeV**
** ****─  ****M****H**** = 117****+67****-45**** GeV**** **
** ****─  ****M****H**** < 251 GeV (95% cl)**

**Prospects with 2 fb****-1**** :**
** ********M****W**** = 40 MeV per channel & exper ****(current WA = 34 MeV)**
** ********M****t   **** =  2 GeV                                      ****(current WA = 4.3 GeV)**
** ********M****H**** / M****H**** ****≈ 35 %**

## SM Higgs Overview

**Production**

**Decay**

** ****for low mass Higgs use **
**   ****associated production**
** ****for M****H**** > 140 GeV use WW***** **

**Sensitivity**

##  SM Higgs Searches  

**W ( ******** e******** ) + bb candidate**

**WW ******** e******** e******** or ZZ ******** ee******** cand**

**Z ******** bb signal**

##  SM Higgs Searches

**H ******** bb data**

**H ******** WW****(*)**** ******** l****+****l**********

**e******

**ee, ******
** ****e******

**W ******** l******** + ****≥ 2j (≥ 1 b tag)**

**W ******** e******** + **** 2j (2 b tag)**

##  SM Higgs Search Results

******(pp ******** WH) ****·**** BR(H********bb)**
**      ****< 12.4 pb @ 95% C.L****.**
**             ****for ****M****H**** = 115 GeV**
******(pp ******** H) ****· BR(H********WW* )**

## Summary of cross section measurements

**Summary of cross section measurements**

##       b quark production cross-section:
Run I cross-section: ~3x old NLO QCD 
Theoretical advances:  
     Next-to-Leading-log resummations, non perturbative fragmentation function from LEP, new parton distr. functions
Run II preliminary result  

**Run I** **cross-section:** ~3x old NLO QCD
**Theoretical advances:**
-      Next-to-Leading-log resummations, non perturbative fragmentation function from LEP, new parton distr. functions
**Run II preliminary result ******

**Inclusive**** ****J/********, H****b***** *****& top***** *****cross sections**** **** **

**     ****J/******** inclusive cross section:**
-      J/ acceptance down to pT = 0
-  (|y(J/)|<0.6) = 4.08±0.02+0.60 -0.48 b

**top pair production cross section:**

## X(3872)  J/ +-

**X(3872) ******** J/******** ********+********-**

** ****Announced by ****BELLE**** in 2003     ******
** ****Local interest**
**  ****- **1994: E705 (fixed target at FNAL)
-     inLi  J/ +- + anything
-     observed 58 ± 21 excess events
-     at 3.838 ± 0.013 GeV
**  ****possible interpretations**
**  ****1****P****1****(1****+-****), ****3****D****2****(2****--****), ****1****F****3****(3****+-****)**** ****cc**** or ****ccqq**
** ****- **1995: E672/E706 52 ± 30 events

**E705**

**E672/E706**

## X(3872) confirmed by CDF & D0

| Exp | Lumi [pb-1] | range | Mass [MeV] | M res | Signal | Signif |
| --- | --- | --- | --- | --- | --- | --- |
| CDF | 220 | |y| < 1 | 3871.3 ± 0.7 ± 0.3 | 4.9 | 730 ± 90 | ≈ 12 |
| DØ | 230 | |y| < 2 | 3871.8 ± 3.1 ± 3.0 | 17 | 522 ± 100 | ≈ 5 |

**Belle:**  MX = 3872.0  0.6  0.5   MeV

## X(3872) – (2S) comparison

** **Is the ***X*** charmonium,   D – D*  molecule, ccg hybrid, ... ?
-   No significant differences between** **********(****2S****)**** **and ***X***** ** have been observed yet
-   From isolation and decay length comparisons, the production of **X** appears to have
-       the same mixture of prompt and long-lived fractions as the** **********(****2S****)**

**Isolation = 1**

**Decay**
**Length**
**< 0.01cm**

**Cos(************)**
**< 0.4**

**p****T ****(J/********)**
**> 15 GeV**

**|y| <1**

**Cos(************)**
**< 0.4**

## Pentaquarks at Tevatron ?

**Pentaquarks at Tevatron ?**

** ********+****: ****Summary of evidence:**
**      **10 pos., several neg. reports,
-       mass consitency?

## Search for +  pK0s  p+ -

**Search for ********+**** ******** pK****0****s**** ******** p********+ ********-**

**Two energy ranges:**
**  ****-  **minbias,  jet20
**Protons**** identified with ****ToF**
**Reference states **
**    ****reconstructed**

**No evidence for **
**narrow resonance**

****** ****(1520) ******** p K****-**

## Search for(1860)   &     Charmed Pentaquarks

- Search for(1860)   &     Charmed Pentaquarks

**Protons identified with ToF (p<2.75 GeV)**
**And dE/dx (p>2.75 GeV, ~2s separation**

**Special tracking for long lived **
**Hyperons in the SVX detector**

## Pentaquarks at Tevatron -  Summary

- With: high statistics
- 	         excellent mass resolution
- 	         good particle ID
- 	         strong conventional signals
-     ** ****CDF** finds **no pentaquark states with u, s, c antiquarks**
- Beauty pentaquark ?          ******+****b****  **  analog of    ******+****s**        **?**
- 				     **|uuddb>       |uudds>     ?**
- 				    ******+****b**** ******** pB****0   ****  ********+****s**** ******** pK****0****s****  ?**
**                              ****B****0**** ******** J/******** K*  ,  K* ******** K********signals :****	****	**** **

##   New B hadron mass measurements  

** ****Mass measurements from exclusive B********J/******** X channels:**

|  | mass, MeV/c2 
 CDF -preliminary  | mass, MeV/c2 
PDG   |
| --- | --- | --- |
| B+ | 5279.10  0.41  0.34 | 5279.0  0.5 |
| B0 | 5279.57  0.53  0.30   | 5279.4  0.5 |
| Bs | 5366.01  0.73  0.30    | 5369.6  2.4 |
| b | 5619.7  1.2  1.2            | 5624  9 |

**m********s**** ) &  m(********b****) – the world best measurement**

## Observation of Bd**   

**Observation of B****d******   **

**B****d**********  is seen ( with ~115 pb****-1**** )**
** ****ICHEP 04**
**    ****B****1**** & B****2**** separated**
**    ****> 600 events**
**   ****mass measurement**
** **

-  ** ****bq  Spectroscopy: **Lowest states:
-  **B (J****P ****= 0****- ****)** – stable particle;
-  **B***** ****(J****P ****= 1****- ****)** – decays to **B****γ**(100%);
-  **2** narrow states **B****1********* (1****+****)** & **B****2***** ****(2****+****)** – decay through D-wave;
-  **2 **wide states **B****0*****w ****(0****+****)** & **B****1*****w ****(1****+****)** – decay through S-wave
-     too wide to be observed;
-    **B**  &  **B******* are well established;
-    **B****1******* & **B****2***** ** (also called **B******** ) are not known

## B  XcXcD+/D0/D*/D**  

**B ******** X****c********X****c********D****+****/D****0****/D*/D**  **

**   ****Observed excess of events in **
**    ****right-sign combinations  ****D********* **
**    ****interpreted as a merged  **
**    ****D****1****0 ****(2420) & D****2****0 ****(2460****) signal**
**  ****Work in progress:**
-      extract separate **amplitudes**,
-      & **relative phase**

**Hadronic mass moments measured**
**and OPE parameters extracted**

- Measurement of **mass moments** provides constraints on the OPE parameters and improves determination of** ****V****cb**

## B Hadron Lifetimes: Expectations and Existing Data

**Heavy Quark Expansion** **Theory** predicts lifetime ratios in ** rough** agreement with  data
- Experimental and theoretical uncertainties are comparable*** ***
- Tevatron  the best source
-      of Bs and b
**Goal ******** measure the ratios accurately*****	*****      **** **

## Exclusive B Lifetimes; CDF results    

- Lifetime Ratios (most systematic uncertainties 100 % correlated)
- ******B****+****) / ******** (B****0****) = 1.080 **** ****±****  0.042 (*****tot.*****)**
******B****s****) / ******** (B****0****) = 0.890 **** ****±****  0.072 (*****tot.*****)**
**D0** Results with comparable accuracy are expected for ICHEP 04

| B meson |   N(B) |         (B), ps | PDG’03, ps | Single best measur., ps |
| --- | --- | --- | --- | --- |
| B+ | ~3390 | 1.662 ± 0.033 ± 0.008 | 1.671± 0.018 | 1.695 ±0.026 ±0.015 |
| B0 | ~1160 | 1.539 ± 0.051 ± 0.008 | 1.537± 0.015 | 1.529 ±0.012 ±0.029 |
| Bs |   ~260 | 1.369 ± 0.100 +0.008
                                  - 0.010 | 1.461± 0.057 | 1.36 ± 0.09+0.06
                         - 0.05 |

## (B+)/(B0d)  from Semileptonic Decays  

**Novel experimental method**
** ****- **Measure ratios directly
-  - Data sample** ****B ******** ********D****0****X**
** ****- **Use slow** ****’****s **to check  if** D****0**** **from** D***
-   - Calculate ratios of  **N(********D*) / N(********D****0**)
-     in several bins of
-    **Visible Proper Decay Length =**
**      ****= L****T ****·**** ****M****B**** / P****T ****(********D****0****)**
** ****- **account for **D**** **feeddown**** **using
-     **PDG BRs** and **MC**

******(****B****+****)/********(****B****0****) = ****1.093 ******** 0.021 ******** 0.022  **** ********  **

## B  J/V   Amplitudes  

-  dominant longitudinal polarization L/ = |A0|2
-   non-zero parity-odd fraction ***┴*** = |A ***┴***** **|2, (P-wave, CP= -1 for Bs)
-  ******s****/********s**** **from **B****s******** J/****** via **3-D** fits (mass, ct, transversity T) from **both ** experiments expected soon --anticipated precision of ******s****/********s**** ≈ 5% at 2 fb****-1**

## Summary - lifetimes

** ****Current Status:**
**   **
**Results competitive with B-factories, ****expect 1% ratio precision  (2 fb****-1****)**** **
**Measurement of polarization amplitudes of**** ****B****d********J********K* ****&****  ****B****0****s********J/******
**Measurement of ********s****/********s**    **in progress**** , ****expect 5% precision (2 fb****-1****)**** **

|   |                  CDF |                        D0   |     World average |
| --- | --- | --- | --- |
|         B+ | 1.662 ± 0.033 ± 0.008 ps | 1.65 ± 0.08 ± 0.12 ps  (2003) |  1.671 ± 0.018 ps |
|         B0d | 1.539 ± 0.051 ± 0.008 ps | 1.51 ± 0.18 ± 0.20 ps  (2003)  ICHEP |  1.537 ± 0.015 ps |
|         B0s | 1.369 ± 0.100±0.008- 0.01 ps | 1.19 ± 0.18 ± 0.14  ps (2003)  ICHEP |  1.461 ± 0.057 ps |
|         Λb | 1.25 ± 0.26 ± 0.10 ps (2003) |  ICHEP 04 |  1.233 ± 0.077 ps |
| (B)/(B0) | 0.91  ±  0.20  (tot)      (2003) |  ICHEP 04 |  0.798 ± 0.052 |
| (B+)/(B0) | 1.08    ± 0.042 (tot.) |  1.093 ± 0.021 ± 0.022 |  1.085  ± 0.017  |
| (Bs)/(B0) | 0.890 ± 0.072 (tot.)   |  ICHEP 04 |  0.951 ± 0.038 |

## Charmless B Decays

**Charmless B Decays**

**Search for ****charmless B decays**
**from gluonic penguin decays**
**using ****displaced track trigger**
**( ~ 180 pb****-1****)**

**B****s****0**** **********
**12 events**

**4.8 ********, first evidence for B****s****0**** **************** **
- BR ± 0.6 ± 0.2± 0.5 ) · 10-5
-  SM 3.7 10-5

- BR = (7.2± 1.3 ± 0.7 ) ·10-6
-  HFAG average = ( 9.0 ± 0.6) · 10-6
-  ACP = 0.07 ± 0.17 ± 0.06

## Bd,s oscillations

**The aim is to measure:**

##  Run II B0d / B0d Mixing Results:  

-  Run II B0d / B0d Mixing Results:

******m****d  ****=**** 0.506 ****±**** 0.055 ****±**** 0.049 ps****** D* X ; Opposite Side  (D0)
******m****d********= ********0.55  ± 0.10   ± 0.01********ps******J/ K*0 & D-+ ; Same Side ** **(CDF**)**
******m****d**** =**** ****0.495 ± 0.026 ± 0.025 ps****-1****  **  all methods CDF Run I
******m****d********0.502 ± 0.007**  world average
- Many improvements to the Run II results underway: all tagging methods, channels, reduced systematics etc

## Semileptonic BS  DsX samples  Ds  K+K- ;   `s charge opposite to Ds

- Work in progress on: Bs/Bd lifetime ratio;  Bs mixing , using also **D****s**** ******** ****K*K**
**D0 **perspective: if******m****s**** = 15 ps ****-1** measurement may be possible with  **0.5 fb****-1******
- Semileptonic **c******** ** measurement will improve constraint on ******s**

## Bs Oscillations – prospectsCDF perspective    from M. Paulini

**B****s**** Oscillations – prospects****CDF perspective   ******** **from M. Paulini

**Current status: fully rec. B****s ******** D****s******
**   **Signal = 1600 events / fb-1
-    S/B = 2/1
-    D2 = 4% (SLT+SST+JQT)
-    t = 67 fs
**Prospects (near term):**
**   ****2****** if******m****s**** = 15 ps ****-1** with **0.5 fb****-1**
-    (assuming no improvements)
-    CDF will reach the current indirect
-    limit & cover the **SM** favored range
**Prospects (long term): **** **
-    (assuming conservative improvements)
**   ****5****** if  ******m****s**** = 18 ps ****-1** with **1.8 fb****-1**
**   ****5****** if ******m****s**** = 24 ps ****-1** with **3.2 fb****-1**

## Rare decays – Bd,s  

**Limits at 90% C.L****.**
**BR(B****s**** ******** ************ ************) ******** ****5.8********10********7**
**BR(B****d**** ******** ************ ************) ******** ****1.5********10********7**
**Expected improvements: **
****** ****Acceptance & ******** bkgs**

**BR(B****s**** ******** ********) ****~ 10****-9****   suppressed in SM**** **
**SUSY up to two orders of magnitude enhancement**

**BR(B****d**** ******** ************ ************) ******** ****1.6 (2.0) ********10********7****  ******** ****Belle (BaBar) at LP03**
**Work in progress on B****0****d**** ************K****(*)**

**Blind analysis, expected limits at 95% C.L****.**
**BR(B****s**** ******** ************ ************) ********1****.0 ********10********6   ****( Moriond 04)**
**Improved for ****ICHEP 04****, box to be **
**opened at 400 pb****-1**

## Summary

-   New **top quark mass**, updated predictions for **SM** **M****H**
-   First Tevatron direct **SM Higgs** production limits ~ x 25
-    above **SM** prediction
-   **X(3872)** confirmed by CDF & D0
-   **Pentaquarks **not seen by CDF
-   **B physics program** competitive and complementary
-     to B factories
-    -  best  **B****s****,  ********b**  mass measurements
-     -  observation of: B**,  narrow D** states in semileptonic B decays,
-         Bs best limits on Bd,s  
-    -  work towards **B****s** oscillations
-    very rich program in EW, QCD, charm, new
-     phenomena etc , not covered in this talk