# Presentation: 668812

## b-Production papers

**PRL 74 (1995) (********b**** result superseded by PL B487)**
**PL B370 (1996)**
**PL B487 (2000)**
**PRL 84 (2000)**
**PRL 85 (2000) * Authors include 2xUvA, 2xKUN**
**9 CDF papers**
**4 UA1 papers**
**7 Theory papers**
**7 D0 notes**
- Links/titles on _[NIKHEF@D0](mailto:NIKHEF@D0)_ homepage (analysis topics – impTag pages)

## Phys.Lett.B487 (2000)

**“****The *****bb*****bar Production Cross Section and Angular Correlations in *****pp*****bar Collisions at *********s***** = 1.8 TeV”**
**Trigger: 1 muon, 1 jet (6.5 pb****-1**** from ’92-’93)**
**Inclusive *****b*****-quark cross sections**
**Dimuon sample, both jets *****b*****-tagged (*****p******T*****rel****, fraction of longitudinal momentum *****r******z*****, time of passage *****t*****0****)**
**	******** *********b*****(*****p******T******b*****>*****p******T******min*****) for *****p******T******min***** = 8 – 25 GeV/c**
**Repeated measurement of PRL 74 (1995): same sample, single muons**
**	**** ******** *********b*****(*****p******T******b*****>*****p******T******min*****) for *****p******T******min***** = 6 – 15 GeV/c**
**Measurement of d*********bb************/d***************

## Phys.Rev.Lett. 84 (2000)

**“****Small-Angle Muon and Bottom-Quark Production in *****pp*****bar Collisions at *********s***** = 1.8 TeV”**
**Data from low luminosity ’94-’95 run (104nb****-1****)**
**2.4<|*****y***********|<3.2, trigger: 1 SAMUS track (>3GeV)**
**Inclusive muon sample ******** d****************/d*****p******T***********d*****y*********
***b*****-quark fraction from *****p******T******rel***
**	******** ***********b************ *****for rapidity 2.40-2.65 and 2.65-3.20**
**Additional measurement on (********+jet) data subset**

## Phys.Rev.Lett.85 (2000)

**“****Cross Section for *****b*****-Jet Production in *****pp*****bar Collisions at *********s***** = 1.8 TeV”**
***b*****-Jets vs *****b*****-Quarks reduce model dependence when comparing to theory**
**5.2pb****-1**** (1995 run), trigger: jet + muon**
**Inclusive muon sample, *****b*****-jet component extracted using *****p******T******rel***
**d**********/d*****E******T******b*****Jet ****for *****E******T***** = ~27-95 GeV (limited by *****p******T******rel*****)**
**Extracted b-fraction is dominant source of uncertainty in ********

## General strategies

**Inclusive single (di-) muon sample, inclusive (di-) muon cross section, extract *****b*****-quark cross section using *****p******T******rel *****(D0: PLB487, PRL84, PRL74) or using “given” fraction *****f******b***** (D0 note 3632, CDF: PRL71,2396)**
**Inclusive muons + jets, b-jet cross section using *****p******T******rel *****(D0: PRL 85, D0 note 3703, D0 note 3705 (quarks), D0 note 3734)**
**Inclusive *****J*****/********************* *****sample, inclusive b-quark cross section using muon transverse impact parameter (D0: PLB370) or mass + secondary vertex (CDF: PRL75)**
**Muon + jet, second jet with displaced vertex (CDF: PRD61)**
**Inclusive electron production, extract b-quark cross section using charge correlations and *****p******T******rel *****(CDF: PRL71,500)**
**Exclusive *****B**************J*****/***********K**********, J*****/*********** **************** *****(CDF: PRL68)**

## Inclusive (di-) muons

**Muon trigger**
**d****************/d*****x***** = (1/***********L**********x*****)x(*****N **********f/***********)**
- X = *p**T****, y***
*N *= number of tagged (fitted) muons
*f* = muon momentum unsmearing factor
** = detection efficiency
*********b*****(*****p******T*****>*****p******T******min*****)***** *****= d****************/d*****p******T***** ******** *****f******b***** ******** ********** ******** ...**
*f**b *= b fraction, based on *p**T**rel*, likelihood fit, MC
***p**T*>*p**T**min *correction factor (from MC)

## Inclusive J/

**Trigger: 2 muons**
***J*****/*********** *****inclusive cross section using *****M***********, *****I***********, *****p******T******rel*********
***f******b *****from opposite sign dimuon impact parameter and mass (D0, 1996) or reconstructed secondary vertex *****c*****t and mass (CDF, 1995)**

## Inclusive muons + jets

**Trigger: muon + jet**
**d***********b*****/d*****E******T***** = (*****U**********f******b***** / 2B***************L**********x********************A*****)x(*********N*****/*********E******T*****)**
*U*(*E**T*) = jet energy resolution smearing
*f**b*(*E**T*) = b-fraction using *p**T**rel*
- B = branching fraction for *b***+*X*
- A = muon tagging acceptance correction
-  = muon + jet detection efficiency
***F******b***** is dominant source of error on cross section**

## Dominating uncertainties

***b*****-fraction (tagging / MC) 9%-39%**
**Integrated Luminosity 5%-10%**
**Trigger efficiency 3%-19%**
**Offline selection efficiency 4%-6%**
**Jet *****E******T***** scale 15%-8%**
**Jet *****E******T***** resolution 7%-3%**
**Tagging acceptance 9%-12%**
**Muon momentum resolution 6%-41%**
**Other background subtraction ~15%**