# Presentation: 448918

## Flavor Physics

**CKM Matrix**
**B Physics**
**Production**
**New States**
**Lifetimes**
**B****s**** Mixing**
**CP Violation**
**Other Measurements**
**Top Physics**
**Production**
**Spin Correlation**
**W Polarization**
**V****tb**

## Quarks: Flavor 

- (

- )

- CKM Matrix of Flavors: u,d,c,s,t,b

- (

- )

- Wolfenstein Representation

- Different Processes give different elements

## FNAL CKM Measurements

- “KTeV”,
- “KAMI”

- “CKM”

- B Physics
- Colliders?

## CP violation in B decays

- (1,0)

## B Physics: Production

**Central Rapidities**

**Rapidity Dependence**

## B Physics at the Tevatron

**********bb********b********bb****************p******
******B****d****0 ****, B******** , B****s****0**** , B****c**** , ********b **** all produced**** **
**Two main trigger samples:**
**J******************
**high p****t**** leptons **
**To improve S/N:**
**good mass resolution**
**displaced vertex cuts**
**SELECTED CDF RESULTS**
**M(****B******** ****) = 5279.1 ± 1.7 ±  1.4 Mev/c****2**
**          ****M(****B****d****0****) = 5281.3 ± 2.2 ±  1.4 Mev/c****2**
******(****B****s****0 ****) = 1.36 ± 0.09 ±  0.06 ps**
**       ********(****B****s****0 ****)/ ********(****B****d****0 ****) = 0.899 ± 0.072**
**B****c  ****discovery**

**Prompt J/******

**J/************from B’s**

**Side-band background**

- J decay length

## B Physics: Heavier States

- Bc Observation

## B_c Lifetime

## B_c

## B Physics: Lifetimes

**Neutral and Charged very close**
**Note higher mass states B****s, ********b**

## 
A(t) =                                  = cos ( mqt)

reconstruct B-decay
measure displaced vertex
tag  B-flavor at production:                
Soft Lepton Tagging (SLT)
Jet Charge Tagging (QJT)   
Same Side Tagging (SST) 

CDF has five independent Bd0 mixing measurements:
md = 0.481 ± 0.028 ± 0.027 ps-1
CDF has also limits for Bs0 mixing: 
    ms > 5.8 ps-1    @ 95% CL      from  Bs0lX
    ms < 96 ps-1    @ 95% CL      from Bs0Dsl     anal.

**A(t) =                                  = cos ( ********m****q****t)**
**reconstruct B-decay**
**measure displaced vertex**
**tag  B-flavor at production:****                **
**Soft Lepton Tagging (SLT)**
**Jet Charge Tagging (QJT)   **
**Same Side Tagging (SST) **
**                          **
**CDF has five independent B****d****0**** mixing measurements:**
**********m****d**** = 0.481 ± 0.028 ± 0.027 ps****-1**
**CDF has also limits for B****s****0**** mixing:**** **
**    ********m****s**** > 5.8 ps****-1    ****@ 95% CL**** ****     ****from  B****s****0*********l*********X**
**    ********m****s**** < 96 ps****-1    ****@ 95% CL**** ****     ****from B****s****0********D****s*****l*********    ******** anal.**

_**B**__**d**__**0**__** and B**__**s**__**0**__** mixing**_

**V****tb********1**

**V****td**

- Like-sign  asymmetry vs decay-length

- Xq= mq/q   Vtq

## sin (2) measurement

**A****CP****(t) =                                     = sin (2********) sin (********m****d****t)    ****f****  is  J/******** K****s****0**
**Measured asymmetry:     ****A****mea****(t) = ****D****A****CP****(t)**
**Use multiple B flavor tagging  algorithms:        **
**             ****SST          SLT          JCT**
******D****2**** (%)****      ****1.8********0.5     0.91********0.15    0.78********0.14**
****** ****sin******** ********   @ 93% CL****  (Feldman-Cousin statistics)**
**Important Demo at least!!!**

- tf tf

- tf tf

## RUNII : sin 2 

**SIN(2********) FLAVOUR TAGGING**
**      **D2**     **CDF I        CDF II    CDFII +TOF
-   SST()**     ****1.8%****          ****2.0%****      ****2.0%**
-     JCT**       ****0.8%****          ****3.0%****      ****3.0% **
-     SLT**       ****0.9%****          ****1.7%****      ****1.7%**
-   KAON**      ****-****         ****        -****        **2.4%

**SIN(2********) SENSITIVITY**
**statistics of fully reconstructed B-decays is expected to increase by:  **
** ****Run II luminosity                      ********bb****(s) increase**
**   ****Efficiency x Acceptance      e****+****e****-**** channel **
****
**For 2fb****-1 ****:******
**CDF II********(sin 2********) = 0.078****   ****    **
**CDF II+TOF   ********(****sin 2********) = 0.067**
**D0      ********(sin 2********) = 0.10**

## B Physics Measurements

- Bs   Mixing
- use states......
- 20,000 Bs with SVT trigger
- tagging using ....

-                              **x****s   ****Reach  40 - 60**

## B Physics: Other Measurements

- CP Violation in Bs
- Bs J/
- sin 2 , sin 2
- ( tough, need rate, id, space resolution)
- Rare Decays
-         **A Rich and Extensive Program**
-         in good part beyond the B Factory reach

- Asymmetry error vs. xs

##  Top Quark Production Cross Section

- _ __Top Quark Production Cross Section_

** ****(DØ) *********tt*****= 5.9 ******** 1.7 pb**
**(CDF) *********tt*****= 7.6 ******** 1.8 pb**

## New CDF top production cross section:

**6.4 ********       pb.**

**1.5**
**1.3**

**(NEW!)**

##  W Polarization in Top Decay

**SM predicts fraction of longitudinally polarized W’s**
** ****from top decay:  ****F****0**** = M****2****top****/(M****top****2**** + 2M****W****2****) = 0.70**
**Extract W helicity fractions from the shape of the**
**charged lepton p****T**** spectrum in *****t***** ******** *****bW***** *********b***********
** ****better measured than angular correlations**
**  ****unaffected by ******** reconstruction or combinatorics**

-  **assume a mixture**
**of longitudinally**
**polarized and**
**negative helicity**
**W’s produced**
**in top decay**
** ****use a maximum**
**likelihood method**
**to estimate**** F****0**
**(assume positive**
**helicity fraction**
**F****+**** = 0)**

**                       ****F****0** = **0.97 ******** 0.37 ******** 0.12**
**(assume ****F****0**** ****= 0.75)**       **F****+** = **0.11 ******** 0.15 ******** 0.06**