# Presentation: 493104

##  B physics at the Tevatron           S. Donati            University and INFN Pisa          April 2003 Meeting of the           American Physical Society

** ****B physics at the Tevatron****           ****S. Donati  ****          University and INFN Pisa****          April 2003 Meeting of the ****          American Physical Society**

## Why B physics at pp collider

**CDF**

- CLEO

**Open wide spectrum of B hadrons **
**B********, B****0****, B****s****, B****c****, ********b****, ********b **
**bb  cross section is 50-100 ********b **
**~O(10****5****) larger than ****@********(4S)/Z****0**** **
**BUT: **
**B hadrons are hidden in a 10****3**** larger**
**background  (********inelastic****(pp) ******** 50 mb)**
**Events more complicated than at ********(4S)**** **

**Crucial detector components:**
**- Tracking system **
**   ****Excellent pt resolution/Vertexing**
**- Trigger **
**    ****Large bandwidth**
**    ****Strong background reduction**
**- Particle identification**

**CLEO**

## Tevatron pp collider

**Main Injector (new injection stage for Tevatron)**
**   ****Ability to accelerate and deliver higher     intensity of protons**
**   ****More efficient anti-proton production**
**Collision rate: 396 ns crossing time**
**(36x36 bunches) ******** ~ 2M collisions/sec **
**Center of Mass energy: 1.96 TeV**

**Today: luminosity ~4.0 x 10****31**** **** ****cm****-2****s****-1**
**                ****4 to 7 pb****-1****/week delivered  **
**Goal: luminosity: ~10****32 **** cm****-2****s****-1**
**       ****16 pb****-1****/week delivered **
**In this talk: results with 70 pb****-1**** for CDF and 40 pb****-1**** for D0**

**CDF Integrated Luminosity**

**130 pb****-1**** (delivered)**
**100 pb****-1**** (to tape) **
** ****B/Charm:  ~ 70 pb****-1**

**commiss**

## CDF Detector in Run II

**CDF Detector in Run II**

**Tracking System**
-   - **3D Silicon Tracker** (up to ||~2)
-   - **Faster Drift Chamber**
**Time-of-Flight** (particle ID)
-  **Plug and Forward Calorimeters**
-  **DAQ & Trigger system** **(Online Silicon Vertex Tracker: trigger **
** ****on displaced vertices, first time at hadron collider)**

**Completely New:**

**Inherited from Run I:**
**Central Calorimeter (|********|<1)**** **
**Solenoid (1.4T)**

-  **Muon system** (extended to ||~1.5)

**Partially New:**

## D0 detector in Run II

## B Triggers and data samples

- Displaced trk   + lepton (e, ****)
- IP(trk) > 120******m**
- Pt(lepton) > 4 GeV
- Semileptonic modes

- 2-Track Trig.
- Pt(trk) > 2 GeV
- IP(trk) > 100 ******m**
- Fully hadronic modes

- Di-Muon  (J/)
- Pt(******) **> 1.5 GeV (CDF)
- J/ modes down to low Pt(J/)** **(~ 0 GeV)

**- CP violation**
**- Masses, lifetimes  **
**- Quarkonia, rare        decays**

**- High statistics lifetime**
** ****Sample for tagging**
**  ****studies, mixing**

**- B****S ****mixing**
** ****CP asymmetry in 2-body charmless decays**

**(New in CDF/Short term upgrade in D0)**

**(Conventional)**

**Primary **
**Vertex**

**Secondary **
**Vertex**

**d = impact parameter**

**B**

**Decay Length**

- Lxy

**L****xy**** ******** 450********m**

**P****T****(B) ******** 5 GeV**

## Detector calibration:p scale & B-field correction

**D****0**** and ******

**Detector calibration:****p scale & B-field correction**

- Add B scale correction

- Tune missing material

- Correct for material in GEANT

- 1S

- 2S

- 3S

- MASS SCALE: **M****CDF ****= M****PDG****-********M(Pt)**
**Use J/******** to correct for B field and energy loss:**
******(scale)/scale ~ 0.02%**

- D0

****

## Mass measurements

|  | CDF mass    (only~20 pb-1) |  |
| --- | --- | --- |
| B+ | 5280.6  1.7  1.1 | 0.8 |
| Bd | 5279.81  1.9  1.4 | 0.2 |
| Bs | 5360.3  3.8   | -2.1 |
| (2S) | 3686.43  0.54 | 0.9 |

**D****s****±**** - D****±**** mass difference**
**Both D ************ ******** ****(************KK)**
******m = 99.28 ****± 0.43 ± 0.27MeV**
**PDG: 99.2 ± 0.5 MeV ****(CLEO2, E691)**
**Systematics dominated by background modeling**

**M(****B****s****) is already the ****second best**** in the world (after CDF RunI)**

**FIRST CDFII PAPER**

**2.12.9**

**See A. Korn’s talk**

## Conventional way to B: J/

**Conventional way to B: J/******

- L ~ 40 pb-1
- 75k J/****** ******

**CDF triggers on stopped J/************ ********: pt(********) ******** ****1.5 GeV/c,  pt(****J/********) ******** 0 **

**CDF can measure cross section down to p****T**** = 0 (first at hadron collider)**
******(pp********J/********; p****T****>0; |********|<0.6) =**
**240 ******** ****1 (stat) ********35/28(syst) nb**
**See Y. Gotra’s Talk**

## First step: Inclusive B  J/X Lifetime

**First step: Inclusive B ******** J/********X Lifetime**

**Estimate ********B  ****through ************ **

**MC**

**CDF July 2002 (18 pb****-1****):** **=1.526****0.034****0.035 ps**
**D0 March 2003 (40 pb****-1****):** **=1.561****0.024****0.074 ps**
**PDG 2002: ****= 1.674 **** 0.018**

**D0 Run II Preliminary**

**B**

**D0 Run II Preliminary**

**J/******

## B Lifetimes

_**H**_**eavy **_**Q**_**uark **_**E**_**xpansion**
**predicts the lifetimes for**
**different  B hadron species**
******(B****c****) << ********(********b****0****) ~ ********(********b****)     **
** ****< ********(B****0****)  ~ ********(B****s****) < ********(B****-****)****     **
**  ****< ********(********b****-****) < ********(********b****)**
-  ******(B****+****)/********(B****0****) ****= ****1.03-1.07**
** ********(B****s****)/********(B****0****) ****= ****1.00 **_**+**_** 0.01**
** ********(********b****)/********(B****0****) ****= ****0.9-1.0**

** ****B****+****/B****0**** and B****s****/B****0**** measurements    agree with prediction**
** ****Small discrepancy for**** ********b ****lifetimes**** **
** ****LEP + CDF Run I**

## Exclusive B  J/KLifetime (1) 

**Use exclusively reconstructed B**   **B****+**** ********J/******** K****+**
**B****0**** ********J/******** K****0***** (K****0***** ******** K********)**
**B****s**** ******** J/******** ********  (******** ********KK)**
******b********J/******** (************p********)**

**Simultaneous fitting of**
**M****B****: Extract signal fraction**
**ct:  Extract the lifetime**

**CDF March 2003 (70 pb****-1****):**** ********(****B****+**** ****)=1.57********0.07********0.02 ps**
**D0 March 2003 (40 pb****-1****):**** ********(****B****+**** ****)=1.76 ******** ****0.24 ps**

## Exclusive B  J/K lifetime (2)(Bs Unique to Tevatron)

|  | CDF Preliminary |
| --- | --- |
| B+ | 1.57  0.07  0.02 (ps) |
| Bd | 1.42  0.09  0.02 (ps) |
| Bs | 1.26  0.2  0.02 (ps) |

- Systemat.  & statist. errors already @ Run I level

- Use control channels: **B****u**** ******** J/******** K****+** and **B****d**** ******** J/******** K****0***
- Measurement limited only by statistics

- Important for simultaneous  measurement

- = 0.89  0.15

- = 1.11  0.09

**c********, [cm]**

**See K. Anikeev’s Talk **

## Physics with B0s J/  

**CDF: largest fully reconstructed**
**sample in the world: 74 ********11 evts**
**        ****Yield/Lumi = 2 x RunI**
**CP asymmetry measures the weak **
**phase of V****ts**** (angle**** ********s**** = 2********s ****)**
**Expected to be very small:**** ****sin(2********s ****)**** ******** ****O(************) ******** ****0.03**
**Complicated analysis: requires ****x****s**** ****and angular analysis to **
**                        ****disentangle CP even/odd final states**
_**CDF reach**_ : ******sin****(2 ********s ****)************0.1 with 2fb****–****1**** (********0.03-0.06 with 10fb****–****1****)**
-           **If asymmetry observed with 2fb****–****1**** ******** signal for NEW Physics**
**We also want to measure the lifetime difference:**** ********s**** = B****s****H****- B****s****L**** **
**Current limit (LEP):**** ********s**** / ********s ****<****0.31 (****S.M.:**** ********= 0.05 - 0.20)**

**Physics with B****0****s *********J*****/*********** *******

## More about BJ/ signals

**More**** ****about B********J****/******** ****signals**

******0****b********J/******** Br.Ratio and Lifetime meas. in **
**progress (see T. Yamashita, R. Madrak’s Talk)**

**CDF**

**D0**

**B****0********J/********K****0****s**

**CDF~220 events**

******0****b********J/******

**First steps towards **
**sin(2********)**
**Measurement**

## B+/B0 from lepton+displaced track

**B****+****/B****0**** from lepton+displaced track**

**CDF: high statistics semileptonic B samples**
**Excellent calibration samples for **B+/B0 **lifetime,**
**tagging and  **B0 **mixing**
**B****lD****0****X (D****0**K**):** **~10,000 events**
**B****lD*****+****X (D*****+****D****0****):** **~1,500 events**
**B****lD****+****X (D****+**K**):** **~5,000 events**

**Run II yields**
**significantly larger,**
**lower lepton pt threshold possible**
**thanks to i.p**
**trigger**

**CDF**

**CDF**

**CDF**

## BS  from lepton + displaced track

**B****S  ****from lepton + displaced track**

- HIGH STATISTICS SAMPLE:
-  Inclusive lifetime: 
-  Mixing (moderate xs):
- good S/N, limited time resolution: back-up sample

**B****s**** ******** D****s****l************ [********] l******** ******** [[KK] ********]l******  ONLY @ Tevatron

- Efficiency vs c****

- MC

**ARBITRARY UNITS**

- Systematics of trigger bias

**385 ******** 22 D****s**
**(muon only)**

## b  from lepton+displaced track

-  Branching Ratio
-  Measure  
-   Q2 = m(l)
-   important for theory
- Experimental challenge:
- disentangle from decays through excited baryons

******b**** ******** ********c****l******** ******** [pK********] l******

-  **Yield/Lumi = 4 x RunI **
** ****S/N ~ 2 x Run I**

- Time of flight

- dE/dx +

## Physics with the hadronic trigger

**Physics with the hadronic trigger**

- Reconstructed large (0.5M) D mesons:
- D K, D0 K, D* D0, Ds 
- D0 KK, D0 
- See K. Stenson’s (Charm Physics review),
- C. Chen (D x-section),
- S. Vallecorsa (D Cabibbo supp. decays),
- M. Campanelli (D orb. excited states)
- talks for CDF Charm results

- D’s from
- Primary Vertex
- have d 0

**             **            **Direct Charm**** **
**D****0********K******             **86.5 ******** 0.4 % (stat)**
**D*************D****0**          **87.6 ******** 1.1 % (stat)**
**D************K******          **89.1 ******** 0.4 % (stat)**
**D****s************             ****72.4 ******** 3.4 % (stat)**
**     **** ****B fraction ******** 10 - 20 %**

- D mesons I.P. (d) distribution

***D***

- d(D)

***D***

***B***

**CDF: open access to  fully **
**hadronic D and B signals **

## Ingredients for B0s mixing 

**Ingredients for B**0**s**** mixing **

**N****unmix****(t) – N****mix****(t)**

**N****unmix****(t) + N****mix****(t)**

**= D********cos(********m****s****t)**

**A****mix****(t) =**

**Reconstruct the final state**  **(use fully rec. ****B****0****s**** → ****D****-****s**** ****π****+****(3****π****))**
**with good S/B **** ****(thanks to precise tracking, vertexing, PID)**

**60 fs** (SVX II detector)
**45 fs** (also Layer 00 is used)

- 3.   **Identify the flavor of B****s**** ****at production:**** B-flavor tagging algorithms**

- 2.    **Measure proper decay time:**

- ;    = PT(B) / M(B)

- Error on B momentum, ~ 15% (semileptonic)
- negligible (~ 0.5%) for
- fully reconstructed final states

- _Current limit_:
- ms  14.4 ps-1

****

****

- 

******m****s****/********m****d**

## First steps towards B0s mixing in CDF

**First steps towards B**0**s**** mixing** **in CDF**

**   ****B****s**** ******** D****s****(*)************ [********] ******** ******** [[KK] ********] ******

**Fully reconstructed**

** ****B****s**** is consistent with**** **
**B****d******** D******** control sample**

**Collect more data **
**and understand tagging**

**See S. DaRonco’s Talk**

## B Flavor Tagging

**B Flavor Tagging**

_**OST**_** (opposite side tagging):**
-  B’s produced in pairs  measure flavor of opposite B

**“****Identify the flavor of B at production”**

**JETQ**: **sign of the weighted average charge **
**              ****of opposite B-Jet**
**SLT**: **identify the soft lepton from semileptonic**
**                 ****decay of  opposite B**

_**SST**_** (same side tagging):**
**B****0**** (****B****0****) is likely to be accompanied close by a ********+**** (********)**
** ****Search for the track with minimum P****T****REL**

_**Figure of merit**_**:**

**** = efficiency ;

-  **Effective size of sample is reduced by** ******D****2**

**D** = “Dilution” = 1 – 2Pmistag

******D****2  **“tagging effectiveness” ****** ****2%**

**b**
**d**
**d**
**u**
**u**

**B****0**

******+**

## NEW in CDF: “Kaon b-taggers”

-  **Exploit K/******** separation of new TOF**
** ****Well suited for strange B mesons**

**Same Side K**: **a**** ****B****0****s**** ****(****B****0****s****) is likely to be accompanied**** **
**                    ****close by a**** ****K+**** ****(****K********) from fragmentation**

**b**
**s**
**s**
**u**
**u**

**B****0****s**

**K****+**

|  |  |
| --- | --- |
| Jet charge tag  | Muon tag |
| 63.0  3.6 % | = 8.3    1.9% |
|  D=15.8  8.3 % | D=44.4  21.1 % |
| 2.4   1.7% | 3.3   1.8 % |

**D0 Run II Preliminary**

**For CDF studies see A. Ratikin and T. Moulik’s Talks**

**Opposite Side K**: **due to b********c********s it is more likely that a ****B**** meson**
**                          ****contains in final state a ****K******** than a K+**
-          ****** ****to identify a ****B****0****s**** look for a ****K******** from the decay of the opposite B**

## Physics with B0  h+h- 

** ****Invariant mass shape (********M**** ~25 MeV)**
** ****Kinematical variables**
** ****Particle Identification **
** ****Oscillation of CP asymmetry**

**300 events** **in 65 pb****-1**** of  CDF Hadronic **
**Trigger data with very good S/B**
**B****0**** ******** h****+****h****-**** ****is a mixture of **
**B****d************; B****d********K********B****s********K********B****s********KK**

**Physics with B****0**** ******** h****+****h****-**** **

- Can soon perform interesting measurements:
-  Relative B. Ratios: **B****d******** ********/********; B****s******** KK/K******
-  Direct CP asymmetries in **B****d**** ********K******self tagging)
-  CP asymmetries in **B****d**** **********(with b-tagging)
_**Later on**_**:  CKM angle**** ******** **

**CDF II  simulation**

**—****sum**
**B****d********K******
**B****s********KK**
**B****d******** ******** **
**B****s********K ******

**(******** inv.mass)**

## Disentangling the B0h+h-contributions

**Disentangling the B****0********h****+****h****-****contributions**

- Use M vs (1-p1/p2)q1

**See M. Morello’s talk**** **

**B****0****d ******** ******

**B****0****d ********K****-**********

**B****0****d ********K****+**********

**B****0****s ********K****+**********

**B****0****s ********K****-**********

**B****0****s ********KK**** **

**Expected fraction res. (MC ********65 pb****-1****)**
**B****0****d**** ********K********(0.6):  ******  **0.062   (stat)**
**B****0 ****d********(0.15): ******** ** **0.056   (stat)**
**B****0****s********KK(0.2):   ********  ****0.045   (stat)**
**B****0 ****s********K********(0.05): ******  **0.036   (stat)**
**ACP(B****0****d**** ********K********): ****** **0.14 (PDG-2002: ********0.06)**

## Angle  from B0h+h- 

**B****0**** ******** ********+**********  has two (comparable) decay amplitudes:

- Tree

- Penguin

- ACP(t)  =   ACP dir  cos(md t)   +   ACP mix  sin(md t)

- ACPdir, ACPmix  functions of  , , d, ****     (d *e*i****  P / T decay amplitude)

**direct CP**

**CP from mixing alone**

- _R. Fleischer_ ***(PLB 459 (1999) 306):***
- Assume U-spin symmetry (d  s)
- Similar relation holds for Bs   K+K  (md replaced by ms)
- The 4 asymmetries can be expressed as function of  ,  and  P/T amplitude ratio
- Parameters can be extracted from fit of meas. of ACP(t) for Bd and BsKK

**d**

- W+

**u**

- +

- B0

- u,c,t

**d**

**d**

**u**

- 

**(SU(3) breaking effects)**

- Expected (2fb-1) accuracy: (****) = ±10(stat) ±3(syst)

- g

****

****

- 

******m****s****/********m****d**

## Hadronic b  c   signal 

**Measure mass, lifetime, polarization**
**Precise Lifetime****  ******
**Discrepancy with theory:**
**Is it valid for baryons**** ****?**

******b  ******** ********c**** ********  ******** [pK********] ******
**Largest fully rec. hadronic channel**

**NO PID YET**

- pK Mass [GeV]

- pK Mass [GeV]

**See Y. Li’s Talk**

## Conclusions

-   **The upgraded CDF/D0 detectors are taking new data**
** ****Great B physics potential, we have results on:**
** ****Masses, lifetimes in the B*********J*****/**********K exclusive channels**
**  ****and production cross sections**
** ****New impact parameter trigger (CDF-only): huge/clean **
**  ****semileptonic/all hadronic B signals (and also Charm):**
** ****Large and clean B********lDX reconstructed in CDF**
**  ****(excellent for lifetime, tagging and ********m****d ****meas.)**** **
** ****B****0****s**** → ****D****-****s**** ****π****+****: first ingredient towards** ******m****s ****     **
** ****B****0********h****+****h****-****: important results awaiting on our way to ******
**  ****(B****0****s********KK, CP in B****0****d********K********) **
-  **Lots of Beauty (and Charm) at the Tevatron**** **

## Backup Slides

## CDF Integrated Luminosity

- commissioning

**Data used for Today’s results **
**Mar 02 – Jan 03**
**  ****130 pb****-1**** (delivered)**
**  ****100 pb****-1**** (to tape) **
**   ****B/Charm:      ~ 70 pb****-1**

## B physics prospects(with 2fb-1)

- Bs mixing: Bs →Dsπ(Ds3π)  (xs up to 60,  with xd meas. one side of U.T.)
- Angle :    B0→ J/ψ Ks    (refine Run1 meas. up to (sen2)  0.05)
- CP violation, angle γ :   B0→ ππ(πK), Bs → KK(Kπ)
- Angle s and s/ s :  Bs→ J/ψ     (probe for New Physics)
- Precise Lifetimes, Masses, BR for all B-hadrons:  Bs, Bc, Λb ...
-      (CDF observed: Bc → J/ψ e(). Now hadronic channels Bc → Bs X can be explored)
- HF cross sections (beauty and charm)

** ****Stringent tests of SM ... or evidence for new physics !!**

- Both competitive and complementary
- to B -factories

## Sin(2) in B0J/Ks

**Sin(2********) in **B0*J*/**Ks

-  N(B0)(t) - N(B0)(t)

-  N(B0)(t) + N(B0)(t)

- =D****sin(2)****sinmd t

- ACP(t) =

-  **N(*****J*****/*********** *****K****s****) from scaling Run I data:**
-  x 20 luminosity                                8,000
-  x 1.25  tracks at L1 trigger            10,000
-  x 2 muon acceptance                    **20,000**
-  Trigger on *J*/** e+e                  + 10,000

**In Run1 measured:**

- sin(2)=0.79±0.39±0.16

- B0  *J*/** Ks ; *J*/**  

- (**400** events)

- (+60 B0  ****** **(2S) Ks)

- sin(2)=0.91±0.32±0.18

-  **Combined ********D****2****: from ****6.3%**** to ****9.1%**** ****(Kaon b-tag) **

-  **Same S/B = 1**

- Expect: **s(sin2b) ******** 0.05**** **

- With 2fb-1 can refine this measurement
- Although: no way to compete with B-Factories !

- Stat. Error:

**Systematic ~ 0.5xStatistical**
**(scales with control **
**  ****sample statistics)**

****

****

****

******m****s****/********m****d**

## Tevatron Performance     

**Tevatron Performance     **

- July ‘01

**Now**

_**Tevatron operations**_
** ****Startup slow, but progress steady !**
** **_**Now**_**:**  L ~3.5 x 1031 cm-2s-1
-              integrating ~ 6. pb-1/week
-  ... still factor 2-3 below planned values
- additional improvements (~10-20%)    expected from Jan. 3weeks shutdown

_**CDF operations**_
-  Commissioning: Summer 2001
-  Physics data since February 2002
-  Running with >90% Silicon integrated
-   since July 2002

- Initial Luminosity

**3.8 x 10****31**

- 110 pb -1

**July ‘02**

- On-tape Luminosity

- Luminosity (on-tape):
-  ~20pb-1  until June (analyses in this talk)
-  Additional 90pb-1  July – December
-  Reach 300- 400 pb-1 by October 2003

**Feb ‘02**

## Quadrant of CDF II Tracker

**LAYER 00**: 1 layer of radiation-hard silicon at very small radius (1.5 cm)
-                   (achievable: 45 fs proper time resolution in Bs  Ds )

**COT:** large radius (1.4 m) Drift C.
- 96 layers, 100ns drift time
- Precise PT above 400 MeV/c
- Precise 3D tracking in |****|<1
- (1/PT) ~ 0.1%GeV –1; (hit)~150****m
- dE/dx info provides 1 sigma K/****  separation above 2 GeV

**SVX-II + ISL:**  6 (7) layers of double-side silicon (3cm < R < 30cm)
-  Standalone 3D tracking up to |****|= 2
-  Very good I.P. resolution: ~30****m (~20 ****m with Layer00)

**TOF:** 100ps resolution, 2 sigma K/**** separation for tracks below 1.6 GeV/c
- (significant improvement of Bs flavor tag effectiveness)

**TIME OF FLIGHT**

## CDF II Trigger System

**3 levels** : 5 MHz (pp rate)  50 Hz (disk/tape storage rate)
-                   almost no dead time (< 10%)

** ****XFT**: “E**X**tremely **F**ast **T**racker”
-       2D COT track reconstruction at Level 1
-  PT res. pT/p2T = 2% (GeV**-1**)
-  azimuthal angle res. **** = 8 mrad
** ****SVT**: “**S**ilicon **V**ertex **T**racker”
-       precise 2D Silicon+XFT tracking at Level 2
-  impact parameter res. d = 35 ****m
-          **Offline accuracy !! **

- CAL

**COT**

**MUON**

**SV****X**

- CES

**XFT**

- XCES

- XTRP

**SVT**

- L2
- CAL

- L1
- CAL

- GLOBAL
- L1

**L1**
**MUON**

- L1
- TRACK

**GLOBAL**
**LEVEL 2**

- TSI/CLK

**CDF II can trigger on secondary **
**vertices !!**
**       ****Select large B,D samples !!**

**Matched to L1 ele. and muons**

**enhanced J/******** samples**

## SVT: Triggering on impact parameters

-  Combines COT tracks (from XFT) with Silicon Hits (via pattern
- matching)
-  Fits track parameters in the transverse plane (d, ****, PT) _with offline res._
-  All this in ~15s !
-  Allows triggering on displaced impact parameters/vertices
-  CDF becomes a beauty/charm factory

- ~150 VME boards

## B triggers: conventional

- Suffer of low BR and not fully rec. final state

**Need**** ****specialized triggers**

- (bb) / (pp)  10-3

_**CDF Run1**_**, lepton-based triggers: **

-  Di-leptons  (, PT  2 GeV/c): B  J/ X, J/  
-  Single high PT lepton ( 8 GeV/c): B  l  D X

_**Now enhanced**_**, thanks to XFT **(precise tracking at L1) **:**
-  Reduced (21.5 GeV/c) and more effective PT thresholds
-  Increased muon and electron coverage
-  Also J/  ee

- Nevertheless, many important measurements by CDF 1:
-       B0d mixing, sin(2), B lifetimes, Bc observation, ...

## XFT  performance

**XFT  performance**

**XFT: L1 trigger on tracks**
**    ****better than design resolution**
**  ********p****T****/p****2****T**** = 1.65% (GeV****-1****)**
**  ******** ****= 5.1 mrad**

**XFT **
**track**

**Offline**
**track**

**Efficiency curve: **
- XFT threshold at PT=1.5 GeV/c
-  = 96.1 ± 0.1 % (L1 trigger)** **

- 53.000
**J/******** ******** ******

- 11 pb-1

## SVT performance

**SVT performance**

**D****0 ******** K******  used as
- online monitor of the
- hadronic SVT triggers

-  I.P. resolution as planned
- d = 48 m = 35 m  33 m

-   Efficiency

- 80%

- 90%

- _soon_

- transverse beam size

- intrinsic

**S/B ******** 1**

## TOF performance

- TOF resolution (110ps) within 10% of design value

- with
- TOF
- PID

- S/N = 1/40

- S/N = 1/2.5

- Background reduction in ****** ********KK:**
- Low  PT (< 1.5 GeV/c) track pairs
- before and after a cut on  TOF
- kaon probability
- x20 bkg reduction, 80% signal efficiency

## CDF J/cross section

**0<pt****<0.25 GeV**

**5.0<pt****<5.5 GeV**

**10.0<pt****<12.0 GeV**

****(ppJ/****; pT>0; |****|<0.6) =240  1 (stat) 35/28(syst) nb

## Lots of charm from hadronic triggers:  

-  Foresee a quite interesting charm physics program:
-  D cross sections,
-  CP asymmetries and  Mixing in D sector, Rare decays, ...

- (DKK)/(DK)  =   11.17    0.48(stat)    0.98 (syst) %
- (D  )/(DK)  =    3.37     0.20(stat)    0.16(syst) %

- Relative Br. Fractions of Cabibbo suppressed D0 decays :

- Already competitive
- with CLEO2 results
- (10fb-1 @ (4S))
- !!!!!

**With ~10 pb****-1**** of  “hadronic trigger” data:**

- O(10**7**) fully reconstructed decays in 2fb-1

## B0s mixing: expectations with 2fb-1

- Signal: 20K ( only) - 75K (all) events
- with SVT hadronic trigger
**BR (D****s ********) = 0.3 % ; BR (D****s ******** ******** ********) = 0.8 %**
- Resolution:
****(c****) = 45 fs (with Layer00)
****D2 = 11.3% (with TOF)
- S/B:  0.5-2  (based on CDF I data)

**5******** sensitivity up to:**** **
**  ****X****s ****= 63 (S/B = 2/1)**
**  ****X****s**** = 53 (S/B = 1/2)**

- S.M. allowed range: 20. < Xs < 35.

**Can do a precise measurement**
**... ****or evidence for new physics !**

-  xs = ms(B0s)

- Bs  Ds, Ds   
-          Ds  , K*K, 

## Projections for xs reach with 2fb-1

**Projections for x****s**** reach with 2fb****-1**

**Xs = 42-63**

- Optimistic: S/B =2/1

- Conservative: S/B =1/2

- _MC simulation_: accounts also for SVT cuts on proper time acceptance,
- non-Gaussian tails in proper time resolution function

**Xs = 32-53**