# Presentation: 295481

## B and c quark production at CDF, s = 1.96 TeV

**Tara Shears,**
**University of Liverpool,**
**On behalf of the CDF collaboration**

**A361**
**A613**

## Outline

**Introduction**
- The CDF detector
- Collected luminosity
- Heavy quark production at Run 1
**Tests of heavy quark production at Run 2**
- Charm meson production
- J/ production
- Photon + bottom/charm production
**Conclusions**

## CDF Detector

**Run 2:**
**New tracking detectors**
**SVT displaced track trigger**
**Muon, Calorimetry coverage extended**

## CDF luminosity

- Between ~6 and 67 pb used in analyses presented here

##  Historical context: Run 1

**Nason, Cacciari**
**UPRF-2002-4**

**CDF Preliminary:********(D*)**

**Cacciari: hep-ph/9702389**

******(B+): Phys Rev D65 052005**

**Discrepancy** from Run 1:
**********(**data**)/********(improved **theory**) ~ 1.7**
**C****: **similar effects seen** **
**Aim:** test predictions at Run 2

**Notes:**
Was 2.9

## Tests of b and c production at Run 2

- 3 analyses presented:
- Charm meson production
- J/ production
- Photon + heavy flavour production

**bottom**

**Direct** and **combined** measurements

## Charm production: D0,D+,D*+,Ds+

- Use **SVT** (5.8 pb-1) to obtain
**D****0**** ******** K****-**** **********
**D*****+**** ******** D****0**** **********
**D****+**** ******** K****- ******************
**D****s****+**** ******** **********
- Determine prompt component (fit D impact parameter)
- Compare D to NLO

**Combinatorics**
**Wrong K-******

**D****0**** i.p.**

**Notes:**
5500 d*
28000 d+
815 ds

## Charm production: D0,D+,D*+,Ds+ 

******(D****0****,  p****T**** ******** 5.5 GeV) = 13.3±0.2±1.5μb **
******(D*****+****, p****T**** ******** 6.0GeV) = 5.2±0.1±0.8μb **
******(D****+****,  p****T**** ******** 6.0 GeV) = 4.3±0.1±0.7μb **
******(D****s****,  p****T**** ******** 8.0 GeV) = 0.75±0.05±0.22μb**** **

**Nason & Cacciari hep-ph/0306212**

## c + b production : (J/)

******(J/********) = 240 ****± ****1(stat.)        (sys.)  nb**

**+35**
**-28**

**c + b production : ********(J/********)**

- Sample: 300 000 J/
-  pT > 0 GeV, ||<0.6
- Sample contains c and b contributions
- J/ cross-section agrees with Run 1
- No comparison to theory yet ((b) for LP03)

**P****T****(J/********)**

******(J/********)**

**Notes:**
Main sys: j/psi pt spectrum, j/psi polarisation (acceptance), L1 trig + mass fits (pt dependent)

##  + b /  + c  production

****** ****+ b / ******** + c  production**

-   Et > 25 GeV (||<1.0) + jet with secondary vertex
- Determine b, c, uds contributions (fit secondary vertex mass)
- Subtract bkg, find cross-section as fn.  Et

**Sec. Vertex mass (GeV)**

##  + b /  + c production

**Results consistent with LO**

******(********+b)**

******(********+c)**

## ( + c) / ( + b)

**Ratio consistent with LO**

## Conclusions

**Charm cross-section:**
- Run 2 measurement consistent with Run 1
- Still slightly higher than theory (**1.7**)
**Bottom cross-section:**
- Run 2 J/ cross-section consistent with Run 1
- B cross-section forthcoming for LP03
**Photon+b, photon+c cross-section:**
- Agree with LO
- Currently statistically limited

## Backup slides

##  + b /  + c production

**Dominates for ********c**

**Diagrams equal for ********b**

**LO**

**+**

**(estimates from Madgraph)**

## Systematic errors: (b) 

| Systematic error (pb) | 25 – 29 GeV | 29 – 34 GeV | 34 – 42 GeV | 42 – 60 GeV |
| --- | --- | --- | --- | --- |
| Tag efficiency | +1.7 –1.3 | +2.6 –2.0 | +0.9 –0.7 | +1.1 –0.9 |
| Photon id | ± 0.2 | ± 0.1 | < 0.1 | ± 0.1 |
| Jet correction | ± 0.5 | ± 0.5 | ± 0.1 | ± 0.1 |
| Jet energy scale | +3.3 –1.4 | +2.2 –2.1 | +0.5 –0.3 | +0.5 –0.4 |
| B jet correction | ± 0.2 | ± 0.3 | ± 0.1 | ± 0.1 |
| CPR fake estimate | - 0.1 | < 0.1 | < 0.1 | < 0.1 |
| trigger | +2.5 –1.7 | < 0.1 | < 0.1 | < 0.1 |
| PDF | ± 0.3 | ± 0.5 | ± 0.2 | ± 0.2 |
| luminosity | +0.7 –0.6 | +1.1 –1.0 | +0.4 – 0.3 | +0.5 –0.4 |
| Final value | 11.2 +16.4
 -8.2 | 17.2 +12.3
 –10.1 | 6.2 +6.4
 –4.4 | 7.9 +5.0
-4.1 |

## Systematic errors: (c)

| Systematic error (pb) | 25 – 29 GeV | 29 – 34 GeV | 34 – 42 GeV | 42 – 60 GeV |
| --- | --- | --- | --- | --- |
| Tag efficiency | +26.5 –19.8 | +13.1 –9.9 | +7.4 – 5.6 | +8.7 –6.4 |
| Photon id | ± 2.2 | ± 0.4 | ± 0.3 | ± 0.4 |
| Jet correction | +7.9 –7.2 | +2.5 –2.4 | 0.8 | 0.4  |
| Jet energy scale | +48.0 –21.0 | +10.4 –9.6 | +3.5 –2.4 | +2.9 –2.3 |
| CPR fake estimate | - 0.6 | - 0.1 | - 0.2 | + 0.2 |
| trigger | +37.3 –25.3 | < 0.1 | < 0.1 | < 0.1 |
| PDF | ± 2.2 | ± 0.7 | ± 0.3 | ± 0.2 |
| luminosity | +9.6 – 8.6 | +5.0 –4.4 | +2.8 –2.5 | +3.0 –2.7 |
| Final value | 164.7+163.2 -106.5 | 81.1 +71.0
 –53.0 | 45.4 +46.8
 –31.3 | 50.0 +37.3
 –30.9 |

## Systematic errors: (c)/(b)

| Systematic error (pb) | 25 – 29 GeV | 29 – 34 GeV | 34 – 42 GeV | 42 – 60 GeV |
| --- | --- | --- | --- | --- |
| B tag efficiency | - 1.2 | - 0.6 | - 1.0 | - 0.8 |
| C tag efficiency | +2.4 –1.8 | +0.8 –0.6 | +1.3 –0.9 | +1.1 –0.8 |
| B jet correction | ± 0.2 | ± 0.1 | ± 0.1 | ± 0.1  |
| CPR fake estimate | + 0.1 | < 0.1 | - 0.1 | < 0.1 |
| Final value | 14.1 +41.5
-9.8 | 4.8 +8.7
 –3.3 | 7.4 +19.3
 –5.4 | 6.4 +9.7
 –4.1 |

## Systematic errors: (J/)

## Systematic errors: (D)