B Physics: QCD Monte Carlo Model Predictions · Rick Field & Keith Ellis Run 2 Workshop –...

Rick Field & Keith Ellis Run 2 Workshop – February 2000 Page 1 of 28

B Physics: QCD Monte Carlo Model Predictions

Rick Field - University of Florida

and Keith Ellis - Fermilab

Goals: • Compare the LO parton level predictions of Herwig, Isajet,

and Pythia with the NLO MRSR2 predictions. • Compare the LO parton level predictions with the LO

hadron level predictions (Herwig, Isajet, Pythia). • Compare the LO hadron level predictions of Herwig, Isajet,

and Pythia. Outline: • Integrated Cross Sections (parton level) • Transverse Momentum Distributions (parton level) • Pseudo-Rapidity & Rapidity Distributions (parton level) • Integrated Cross Sections (hadron level) • Transverse Momentum Distributions (hadron level) • PT Distributions Parton/Hadron (fragmentation) • Strange Quark Production fs/(fu+fd) (fragmentation) • Y and ηη Distributions Hadron versus Parton • Comparisons between 1.8 TeV and 2.0 TeV • Azimuthal ∆φ∆φ Correlations Hadron and Parton • PT Correlations Hadron and Parton (PT1-PT2) • Pseudo-Rapidity Correlations: dσσ/dηη1dηη2 & R(ηη1,ηη2)

QCD Monte Carlo Models (default parameters):Herwig 5.9 (DO1.1, ΛΛ = 0.18 GeV)Isajet 7.32 (CTEQ3L, ΛΛ = 0.20 GeV)Pythia 6.115 (GRV94LO, ΛΛ = 0.23 GeV)

Pythia 6.115 (CTEQ3L, ΛΛ = 0.18 GeV)

Run 2 Workshop on QCD CDF B-Group Meeting Run 2 Workshop of B Physics

63 Plots!

This Talk

http://www.phys.ufl.edu/~rfield/cdf/Bplots_feb25.pdf

B Physics: Cross Sections Parton Level: Integrated b-quark Cross Section for PT > PTmin

Integrated b-quark Cross Section for PT > PTmin

1.0E-03

1.0E-02

1.0E-01

1.0E+00

1.0E+01

1.0E+02

5 10 15 20 25 30 35 40

PTmin (GeV)

MRSR2 b-quark

Herwig b-quark

Isajet b-quark

PythiaC3L b-quark

Pythia b-quark

1.8 TeVall y

σσ µµb

Plot shows σσ(PT>PTmin) (in µµb) for b-quarks at 1.8 TeV (all Y). Parton Level: Integrated b-quark Cross Section for PT > PTmin

1.0E-03

1.0E-02

1.0E-01

1.0E+00

1.0E+01

1.0E+02

5 10 15 20 25 30 35 40

PTmin (GeV)

MRSR2 b-quark

Herwig b-quark times 2

Isajet b-quark times 2

Pythia b-quark times 2

1.8 TeVall y

σσ µµb

Plot shows σσ(PT>PTmin) (in µµb) for b-quarks at 1.8 TeV (all Y). Herwig, Isajet, and Pythia have been increased by a factor of two.

B Physics: Cross Sections Parton Level: Ratio MRSR2/Monte-Carlos

5 10 15 20 25 30 35 40

PTmin (GeV)

MRSR2/Herwig

MRSR2/Isajet

MRSR2/PythiaC3L

MRSR2/Pythia

1.8 TeVall y

Plot shows the ratio of σσ(PT>PTmin) for b-quarks at 1.8 TeV (all Y) from MRSR2 to Herwig, Isajet, Pythia, and PythiaC3L.

Parton Level: Integrated b-quark Cross Section for PT > PTmin

1.0E-03

1.0E-02

1.0E-01

1.0E+00

1.0E+01

5 10 15 20 25 30 35 40

PTmin (GeV)

MRSR2 b-quark

Herwig b-quark

Isajet b-quark

Pythia b-quark

D0 Data

CDF Data

σσ µµb

1.8 TeV|y| < 1

Plot shows σσ(PT>PTmin) (in µµb) for b-quarks at 1.8 TeV (|Y|<1).

B Physics: Cross Sections Parton Level: Integrated b-quark Cross Section for PT > PTmin

1.0E-03

1.0E-02

1.0E-01

1.0E+00

1.0E+01

1.0E+02

5 10 15 20 25 30 35 40

PTmin (GeV)

MRSR2 b-quark times 2

Herwig b-quark times 4

Isajet b-quark times 4

Pythia b-quark times 4

D0 Data

CDF Data

σσ µµb

1.8 TeV|y| < 1

Plot shows σσ(PT>PTmin) (in µµb) for b-quarks at 1.8 TeV (|Y|<1). MRSR2 has been increased by a factor of two and Herwig, Isajet, and Pythia have been increased by a factor of four.

Parton Level: Ratio MRSR2/Monte-Carlos

5 10 15 20 25 30 35 40

PTmin (GeV)

MRSR2/Herwig

MRSR2/Isajet

MRSR2/Pythia

1.8 TeV|y| < 1

Plot shows the ratio of σσ(PT>PTmin) for b-quarks at 1.8 TeV (|Y| < 1) from MRSR2 to Herwig, Isajet, and Pythia.

B Physics: Cross Sections Parton Level: Fraction |Y| < 1 of the b-quark Cross Section

Fraction |y|<1 of the Integrated b-quark Cross Section

5 10 15 20 25 30 35 40

PTmin (GeV)

MRSR2 b-quark Herwig b-quark Isajet b-quark Pythia b-quark

1.8 TeV

Plot shows the fraction |Y| < 1 of the b-quark integrated cross section (PT < PTmin). Parton Level: Fraction |ηη| < 1 of the b-quark Cross Section

Fraction |eta|<1 of the Integrated b-quark Cross Section

5 10 15 20 25 30 35 40

PTmin (GeV)

1.8 TeV

Plot shows the fraction |ηη| < 1 of the b-quark integrated cross section (PT < PTmin).

B Physics: PT Distributions Parton Level: Transverse Momentum Distribution (|ηη| < 1)

Transverse Momentum Distribution dσσ/dPT

1.0E-05

1.0E-04

1.0E-03

1.0E-02

1.0E-01

1.0E+00

1.0E+01

5 10 15 20 25 30 35 40 45 50

PT (GeV)

MRSR2 b-quark

Herwig b-quark

Isajet b-quark

Pythia b-quark

µµb/GeV

1.8 TeV|eta| < 1

Plot shows dσσ/dPT (in µµb/GeV) for b-quarks at 1.8 TeV (|ηη|<1). Parton Level: Transverse Momentum Distribution (|ηη| < 1)

Transverse Momentum Distribution (b-quark)

5 10 15 20 25 30 35 40 45 50

PTmin (GeV)

MRSR2/Isajet MRSR2/Herwig MRSR2/Pythia

1.8 TeV|eta| < 1

Plot shows the ratio of dσσ/dPT for b-quarks at 1.8 TeV (|ηη| < 1) from MRSR2 to Herwig, Isajet, and Pythia.

B Physics: Pseudo-Rapidity Distributions Parton Level: Pseudo-Rapidity Distributions (PT > 5 GeV)

Pseudo-Rapidity Distribution

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

Pseudo-Rapidity ηη

MRSR2 b-quark Herwig b-quark Isajet b-quark PythiaC3L b-quark Pythia b-quark

dσσ/dηη (µµb)

1.8 TeVPT > 5 GeV

Plot shows dσσ/dηη (in µµb) for b-quarks at 1.8 TeV (PT > 5 GeV).

Parton Level: Pseudo-Rapidity Distributions (PT > 5 GeV)

Pseudo-Rapidity Distribution (normalized to 1)

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

MRSR2 b-quark Herwig b-quark Isajet b-quark PythiaC3L b-quark Pythia b-quark

(1/N)dN/dηη

1.8 TeVPT > 5 GeV

Plot shows (1/N)dN/dηη (normalized to 1) for b-quarks at 1.8 TeV (PT > 5 GeV).

B Physics: Rapidity Distributions Parton Level: Rapidity Distributions (PT > 5 GeV)

Rapidity Distribution

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

Rapidity Y

1.8 TeVPT > 5 GeV

dσσ/dY (µµb)

Plot shows dσσ/dY (in µµb) for b-quarks at 1.8 TeV (PT > 5 GeV). Parton Level: Rapidity Distributions (PT > 5 GeV)

Rapidity Distribution (normalized to 1)

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

Rapidity Y

1.8 TeVPT > 5 GeV

(1/N)dN/dY

Plot shows (1/N)dN/dY (normalized to 1) for b-quarks at 1.8 TeV (PT > 5 GeV).

B Physics: Cross Sections Hadron Level: Integrated B-quark Cross Section for PT > PTmin

Integrated Cross Section for PT > PTmin

1.0E-04

1.0E-03

1.0E-02

1.0E-01

1.0E+00

1.0E+01

5 10 15 20 25 30 35 40 45

PTmin (GeV)

Pythia b-quark

Pythia B-mesons

Isajet b-quark

Isajet B-mesons

Herwig b-quark

Herwig B-mesons

σσ µµb

B-mesons = (B+,B0,Bs0)

1.8 TeV|eta| < 1

B-mesons

b-quark

Plot shows σσ(PT>PTmin) (in µµb) for B-mesons (B+,B0,Bs

0) and b-quarks at 1.8 TeV

(|ηη| < 1). Hadron Level: Integrated B-quark Cross Section for PT > PTmin

Integrated Cross Section for PT > PTmin

1.0E-07

1.0E-06

1.0E-05

1.0E-04

1.0E-03

1.0E-02

1.0E-01

1.0E+00

1.0E+01

5 10 15 20 25 30 35 40 45

PTmin (GeV)

σσ µµb

Isajet at 1.8 TeV|eta| < 1

B-mesons fromtop quarks

B-mesons frombottom quarks

Plot shows σσ(PT>PTmin) (in µµb) for B-mesons (B+,B0,Bs

0) from b and t-quarks 1.8

TeV (|ηη| < 1).

B Physics: PT Distributions Parton & Hadron Level: Transverse Momentum Distribution (|ηη| < 1)

Transverse Momentum Distribution dσσ/dPT

1.0E-05

1.0E-04

1.0E-03

1.0E-02

1.0E-01

1.0E+00

5 10 15 20 25 30 35 40 45 50

PT (GeV)

Pythia b-quark

Pythia B-mesons

Isajet b-quark

Isajet B-mesons

Herwig b-quark

Herwig B-mesons

1.8 TeV|eta| < 1

µµb/GeV

B-mesons

b-quark

Plot shows dσσ/dPT (in µµb/GeV) for B-mesons (B+,B0,Bs

0) and for the b-quark at 1.8

TeV (|ηη|<1). Hadron/Parton Level: Transverse Momentum Distribution (|ηη| < 1)

(B-meson)/(b-quark) Ratio versus PT

5 10 15 20 25 30 35 40 45 50

PT (GeV)

Pythia Herw ig Isajet

1.8 TeV|eta| < 1

Plot shows the ratio of dσσ/dPT (|ηη| < 1) for B-mesons (B+,B0,Bs

0) to b-quark at 1.8 TeV.

B Physics: PT Distributions Hadron Level: B+ Meson Transverse Momentum Distribution (|Y| < 1)

B+ Meson Transverse Momentum Distribution

1.0E-04

1.0E-03

1.0E-02

1.0E-01

1.0E+00

5 10 15 20 25 30 35 40

PT (GeV)

Herwig B+ meson Isajet B+ meson Pythia B+ meson CDF Data CDF Data CDF Data

µµb/GeV

1.8 TeV|Y| < 1

Plot shows dσσ/dPT (in µµb/GeV) for B+ mesons at 1.8 TeV (|Y| < 1). Hadron Level: B+ Meson Transverse Momentum Distribution (|Y| < 1)

B+ Meson Transverse Momentum Distribution

1.0E-04

1.0E-03

1.0E-02

1.0E-01

1.0E+00

5 10 15 20 25 30 35 40

PT (GeV)

Herwig times 4 Isajet times 4 Pythia times 4 CDF Data CDF Data CDF Data

µµb/GeV

1.8 TeV|Y| < 1

Plot shows dσσ/dPT (in µµb/GeV) for B+ mesons at 1.8 TeV (|Y| < 1). The QCD Monte-Carlo predictions have been increased by a factor of four.

B Physics: Fragmentation

CDF Run I Old FF fu 0.408+/-0.068 0.4 fd 0.344+/-0.039 0.4 fs 0.159+/-0.026 0.2 fbaryon 0.089+/-0.029 0.0 fs/(fu+fd) 0.213+/-0.068 0.25

Hadron Level: fs/(fu+fd) Ration versus PT (|ηη| < 1)

fs/(fu+fd) Ratio versus PT

5 10 15 20 25 30

PT (GeV)

Herwig Isajet Pythia CDF Data

1.8 TeV|eta| < 1

Old FF

Plot shows the ratio fs/(fu+fd) at 1.8 TeV (|ηη| < 1), where fs = dσσ/dPT(Bs

0), fu =

dσσ/dPT(B+), and fd = dσσ/dPT(B0).

sbarfs

uππ+

dbarfd

bbarB+

bbarBs0

B Physics: Y and ηη Distributions Parton & Hadron Level: Pseudo-Rapidity Distribution

Pseudo-Rapidity Distribution (normalized to 1)

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

Isajet b-quark Isajet B-mesons Isajet b-quark Isajet B-mesons

(1/N)dN/dηη

Isajet at 1.8 TeV B-mesons = (B+,B0,Bs0)

PT > 5 GeV

PT > 10 GeV

Plot shows (1/N)dN/dηη (normalized to 1) for B-mesons (B+,B0,Bs

0) and for the b-quark at 1.8 TeV (PT > 5 GeV and PT > 10 GeV). Parton & Hadron Level: Rapidity Distribution

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

Rapidity Y

(1/N)dN/dY

Isajet at 1.8 TeV B-mesons = (B+,B0,Bs0)

PT > 5 GeV

PT > 10 GeV

Plot shows (1/N)dN/dY (normalized to 1) for B-mesons (B+,B0,Bs

0) and for the b-quark at 1.8 TeV (PT > 5 GeV and PT > 10 GeV).

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

Herwig b-quark Herwig B-mesons Herwig b-quark Herwig B-mesons

Herwig at 1.8 TeV

(1/N)dN/dηη

PT > 5 GeV

PT > 10 GeV

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

Rapidity Y

Herwig b-quark Herwig b-quark Herwig B-mesons Herwig B-mesons

Herwig at 1.8 TeV

(1/N)dN/dY

PT > 5 GeV

PT > 10 GeV

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

Pythia b-quark Pythia B-mesons Pythia b-quark Pythia B-mesons

Pythia at 1.8 TeV

(1/N)dN/dηη

PT > 5 GeV

PT > 10 GeV

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

Rapidity Y

Pythia b-quark Pythia B-mesons Pythia b-quark Pythia B-mesons

Pythia at 1.8 TeV

(1/N)dN/dY

PT > 5 GeV

PT > 10 GeV

B Physics: Azimuthal Correlations

Beam Axis

∆φ∆φ

b-quark or B-mesons

bbar-quark orBbar-mesons

PT1PT2

Parton Level: Azimuthal ∆φ∆φ Distribution

Azimuthal ∆φ ∆φ Distribution (normalized to 1)

90 100 110 120 130 140 150 160 170 180

∆φ∆φ = |φφ2-φφ1| (degrees)

1.8 TeV1 = b-quark 2 = bbar-quark

|eta1| < 1 |eta2| < 1PT1 > 5 GeV

(1/N)dN/d∆φ∆φ

Plot shows (1/N)dN/d∆φ∆φ (normalized to 1), where ∆φ∆φ = |φφ2-φφ1| for 1 = b-quark and 2

= bbar-quark at 1.8 TeV with |ηη1| < 1, |ηη2| < 1, and PT1 > 5 GeV.

Hadron Level: Azimuthal ∆φ∆φ Distribution

Azimuthal ∆ φ ∆ φ Distribution (normalized to 1)

90 100 110 120 130 140 150 160 170 180

Herwig B-meson Isajet B-mesons Pythia B-meson

1.8 TeV1 = B-meson 2 = Bbar-meson

|eta1| < 1 |eta2| < 1PT1 > 5 GeV

(1/N)dN/d∆φ∆φ

Plot shows (1/N)dN/d∆φ∆φ (normalized to 1), where ∆φ∆φ = |φφ2-φφ1| for 1 = B-mesons

(B+,B0,Bs0) and 2 = Bbar-mesons at 1.8 TeV with |ηη1| < 1, |ηη2| < 1, and PT1 > 5 GeV.

Measures intrensic PT, gluon radiation, fragmentation.

B Physics: Azimuthal Correlations Parton & Hadron Level: Azimuthal ∆φ∆φ Distribution

90 100 110 120 130 140 150 160 170 180

Herwig b-quark Herwig B-meson

1.8 TeV1 = b-quark or B-meson

2 = bbar-quark or Bbar-meson|eta1| < 1 |eta2| < 1

PT1 > 5 GeV

(1/N)dN/d∆φ∆φ

= bbar-quark and for 1 = B-mesons (B+,B0,Bs0) and 2 = Bbar-mesons at 1.8 TeV

with |ηη1| < 1, |ηη2| < 1, and PT1 > 5 GeV. Parton & Hadron Level: Azimuthal ∆φ∆φ Distribution

90 100 110 120 130 140 150 160 170 180

Pythia b-quark Pythia B-meson

1.8 TeV1 = b-quark or B-meson

2 = bbar-quark or Bbar-meson|eta1| < 1 |eta2| < 1

PT1 > 5 GeV

(1/N)dN/d∆φ∆φ

= bbar-quark and for 1 = B-mesons (B+,B0,Bs0) and 2 = Bbar-mesons at 1.8 TeV

with |ηη1| < 1, |ηη2| < 1, and PT1 > 5 GeV.

B Physics: Azimuthal Correlations Hadron Level: Azimuthal ∆φ∆φ Distribution

0 20 40 60 80 100 120 140 160 180

Herwig B-meson Isajet B-meson Pythia B-meson PythiaC3L B-meson

|eta1| < 1 |eta2| < 1PT1 > 5 GeV

(1/N)dN/d∆φ∆φ

(B+,B0,Bs0) and 2 = Bbar-mesons at 1.8 TeV with |ηη1| < 1, |ηη2| < 1, and PT1 > 5 GeV.

Hadron Level: Azimuthal ∆φ∆φ Distribution

90 100 110 120 130 140 150 160 170 180

1.8 TeV1 = B-meson

2 = Bbar-meson|eta1| < 1 |eta2| < 1

(1/N)dN/d∆φ∆φ

PT1 > 5 GeV

PT1 > 10 GeV

PT1 > 25 GeVHerwig B-mesons

(B+,B0,Bs0) and 2 = Bbar-mesons at 1.8 TeV with |ηη1| < 1, |ηη2| < 1, and PT1 > 5, 10,

and 25 GeV.

B Physics: Azimuthal Correlations Hadron Level: Azimuthal ∆φ∆φ Distribution

90 100 110 120 130 140 150 160 170 180

1.8 TeV1 = B-meson

2 = Bbar-meson|eta1| < 1 |eta2| < 1

(1/N)dN/d∆φ∆φ

PT1 > 5 GeV

PT1 > 10 GeV

PT > 25 GeV

Pythia B-mesons

(B+,B0,Bs0) and 2 = Bbar-mesons at 1.8 TeV with |ηη1| < 1, |ηη2| < 1, and PT1 > 5, 10,

and 25 GeV. Hadron Level: Azimuthal ∆φ∆φ Distribution

90 100 110 120 130 140 150 160 170 180

Herwig B-meson Isajet B-mesons Pythia B-meson

|eta1| < 1 |eta2| < 1PT1 > 10 GeV

(1/N)dN/d∆φ∆φ

(B+,B0,Bs0) and 2 = Bbar-mesons at 1.8 TeV with |ηη1| < 1, |ηη2| < 1, and PT1 > 10

B Physics: PT Correlations

Beam Axis

∆φ∆φ

b-quark or B-mesons

bbar-quark orBbar-mesons

PT1PT2

Parton Level: Transverse Momentum Correlations

Transverse Momentum Correlations dσσ/d∆∆PT

1.0E-04

1.0E-03

1.0E-02

1.0E-01

1.0E+00

-20 -15 -10 -5 0 5 10 15 20

∆∆PT = PT1 - PT2 (G e V )

Herwig b-quark Isajet b-quark Pythia b-quark

1.8 TeV1 = b quark 2 = bbar quark

|eta1|< 1 |eta2|<1 |phi1-phi2|>90 degPT2 > 5 GeV

dσσ/d∆∆PT (µµb/Gev)

Plot shows dσσ/d∆∆PT (µµb/GeV), where ∆∆PT = PT1-PT2 for 1 = b-quark and 2 =

bbar-quark at 1.8 TeV with |ηη1| < 1, |ηη2| < 1, |φφ1-φφ2| > 90o, and PT2 > 5 GeV.

Parton Level: Transverse Momentum Correlations

PT Correlations (normalized to 1)

-15 -10 -5 0 5 10 15

∆∆PT = PT1 - PT2 (GeV)

Herwig b-quark Isajet b-quark Pythia b-quark

(1/N)dN/d∆∆PT

1.8 TeV1 = b quark 2 = bbar quark

Plot shows (1/N)dN/d∆∆PT (1/GeV), where ∆∆PT = PT1-PT2 for 1 = b-quark and 2 =

bbar-quark at 1.8 TeV with |ηη1| < 1, |ηη2| < 1, |φφ1-φφ2| > 90o, and PT2 > 5 GeV.

B Physics: PT Correlations Hadron Level: Transverse Momentum Correlations

-15 -10 -5 0 5 10 15

Herwig B-mesons Isajet B-mesons Pythia B-mesons

1.8 TeV1 = B-mesons 2 = Bbar-mesons

(1/N)dN/d∆∆PT

Plot shows (1/N)dN/d∆∆PT (1/GeV), where ∆∆PT = PT1-PT2 for 1 = B-mesons

(B+,B0,Bs0) and 2 = Bbar-mesons at 1.8 TeV with |ηη1| < 1, |ηη2| < 1, |φφ1-φφ2| > 90o, and

PT2 > 5 GeV.

Parton & Hadron Level: Transverse Momentum Correlations

-15 -10 -5 0 5 10 15

Herwig b-quark Herwig B-mesons

(1/N)dN/d∆∆PT

1.8 TeV1 = b-quark or B-mesons

2 = bbar-quark or Bbar-mesons|eta1|< 1 |eta2|<1 |phi1-phi2|>90 deg

PT2 > 5 GeV

bbar-quark and for 1 = B-mesons (B+,B0,Bs0) and 2 = Bbar-mesons at 1.8 TeV with

|ηη1| < 1, |ηη2| < 1, |φφ1-φφ2| > 90o, and PT2 > 5 GeV.

Measures intrensic PT, gluon radiation, and fragmentation.

B Physics: PT Correlations Parton & Hadron Level: Transverse Momentum Correlations

-15 -10 -5 0 5 10 15

Herwig b-quark Herwig B-mesons Herwig b-quark Herwig B-mesons

(1/N)dN/d∆∆PT

PT2 > 10 GeV

PT2 > 5 GeV

|ηη1| < 1, |ηη2| < 1, |φφ1-φφ2| > 90o, and PT2 > 5 and 10 GeV.

Parton & Hadron Level: Transverse Momentum Correlations

-15.0 -10.0 -5.0 0.0 5.0 10.0 15.0

(1/N)dN/d∆∆PT (1/Gev)

PT2 > 10 GeV

PT2 > 5 GeV

Plot shows (1/N)dN/d∆∆PT (1//GeV), where ∆∆PT = PT1-PT2 for 1 = b-quark and 2 =

|ηη1| < 1, |ηη2| < 1, |φφ1-φφ2| > 90o, and PT2 > 5 and 10 GeV.

B Physics: PT Correlations Hadron Level: Transverse Momentum Correlations

-15 -10 -5 0 5 10 15

Herwig B-mesons Isajet B-mesons Pythia B-mesons PythiaC3L B-mesons

(1/N)dN/d∆∆PT

PT2 > 5 GeV.

Hadron Level: Transverse Momentum Correlations

-15 -10 -5 0 5 10 15

Herwig B-mesons Isajet B-mesons Pythia B-mesons PythiaC3L B-mesons

(1/N)dN/d∆∆PT

PT2 > 10 GeV.

B Physics: Pseudo-Rapidity Correlations Correlation Functions:

σηησ

σηη

dC −=

“Normalized” Correlation Functions:

111),(

σησ

σηησ

σηη

“Integrated” (a < ηη2 < b) Normalized Correlation Functions:

∫∫

111)( η

σηησ

Hadron Level: Pseudo-Rapidity Correlations (|ηη2| < 0.5)

Pseudo-Rapidity Correlations dσσ/dηη1dηη2

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

Pseudo-Rapidity ηη11

Herwig B-mesons Isajet B-mesons PythiaC3L B-mesons Pythia B-mesons

(1/σσ)dσσ/dηη1dηη2

1.8 TeV |eta2| < 0.51 = B-mesons 2 =Bbar-mesons

|PT1| < 5 GeV |PT2| < 5 GeV|phi1-phi2|>90 deg

Plot shows (1/σσ)dσσ/dηη1dηη2 versus ηη1, for 1 = B-mesons (B+,B0,Bs

0) and 2 = Bbar-

mesons at 1.8 TeV with |ηη2| < 0.5, |φφ1-φφ2| > 90o, PT1 > 5 GeV, and PT2 > 5 GeV.

Double-Differential Cross Section

B Physics: Pseudo-Rapidity Correlations Hadron Level: Pseudo-Rapidity Correlations (1 < |ηη2| < 2)

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

1.8 TeV 1<|eta2|<21 = B-mesons 2 = Bbar-mesons

|PT1|< 5 GeV |PT2|< 5 GeV|phi1-phi2|>90 deg

0) and 2 = Bbar-

mesons at 1.8 TeV with 1 < |ηη2| < 2, |φφ1-φφ2| > 90o, PT1 > 5 GeV, and PT2 > 5 GeV.

Hadron Level: Pseudo-Rapidity Correlations (1 < |ηη2| < 2)

Pseudo-Rapidity Correlations dσσ /dηη 1dηη 2

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

Herw ig B -mesons Isajet B -mesons Pyth iaC3L B-mesons Pythia B-mesons

(1/σσ)d σσ/d ηη1d ηη2

1.8 TeV 1<|eta2|<2

1 = B -mesons 2 = Bbar-mesons

|PT1|< 10 G e V |PT2|< 10 GeV

|ph i1-ph i2|>90 deg

0) and 2 = Bbar-

mesons at 1.8 TeV with 1 < |ηη2| < 2, |φφ1-φφ2| > 90o, PT1 > 10 GeV, and PT2 > 10 GeV.

Measures PDF’s, fragmentation.

B Physics: Pseudo-Rapidity Correlations Parton & Hadron Level: Pseudo-Rapidity Correlations

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

Isajet b-quark Isajet b-quark Isajet B-mesons Isajet B-mesons

|eta2| < 0.5

1 < |eta2| < 2Isajet at 1.8 TeV

1 = b-quark or B-mesons2 = bbar quark or Bbar-mesons

|PT1|< 5 GeV |PT2|<5 GeV|phi1-phi2|>90 deg

Plot shows (1/σσ)dσσ/dηη1dηη2 versus ηη1, for 1 = b-quark and 2 = bbar-quark and for 1

= B-mesons (B+,B0,Bs0) and 2 = Bbar-mesons at 1.8 TeV with |ηη2| < 0.5 and with 1 <

ηη2 < 2 and |φφ1-φφ2| > 90o, PT1 > 5 GeV, and PT2 > 5 GeV.

Parton & Hadron Level: Pseudo-Rapidity Correlations

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

Pseudo-Rap id ity ηη11

Herwig b-quark Herwig b-quark Herwig B-mesons Herwig B-mesons

Herwig at 1.8 TeV1 = b-quark or B-mesons

2 = bbar quark or Bbar-mesons|PT1|< 5 GeV |PT2|<5 GeV

|phi1-phi2|>90 deg

|eta2| < 0.5

1 < |eta2| < 2

B Physics: Pseudo-Rapidity Correlations Parton & Hadron Level: Pseudo-Rapidity Correlations

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

Pythia b-quark Pythia b-quark Pythia B-mesons Pythia B-mesons

Pythia at 1.8 TeV1 = b-quark or B-mesons

2 = bbar quark or Bbar-mesons|PT1|< 5 GeV |PT2|<5 GeV

|phi1-phi2|>90 deg

|eta2| < 0.5

1 < |eta2| < 2

B Physics: Correlation Functions Hadron Level: “Normalized” Correlation Function

Pseudo-Rapidity Correlations R(ηη1)

-4 -3 -2 -1 0 1 2 3 4

R(ηη1)

1.8 TeV |eta2| < 0.51 = B-mesons 2 =Bbar-mesons

|PT1|< 5 GeV |PT2| < 5 GeV|phi1-phi2|>90 deg

Plot shows the normalized correlation function R(ηη1) versus ηη1, for 1 = B-mesons

(B+,B0,Bs0) and 2 = Bbar-mesons at 1.8 TeV with |ηη2| < 0.5 and |φφ1-φφ2| > 90o, PT1 >

5 GeV, and PT2 > 5 GeV.

Hadron Level: “Normalized” Correlation Function

Pseudo-Rapidity Correlations R(ηη1)

-4 -3 -2 -1 0 1 2 3 4

Pseudo-Rapidity ηη 11

1.8 TeV 1<|eta2|<21 = B-mesons 2 = Bbar-mesons

|PT1|< 5 GeV |PT2| < 5 GeV|phi1-phi2|>90 deg

R(ηη1)

Plot shows the normalized correlation function R(ηη1) versus ηη1, for 1 = B-mesons

(B+,B0,Bs0) and 2 = Bbar-mesons at 1.8 TeV with 1 < ηη2 < 2 and |φφ1-φφ2| > 90o, PT1 >

5 GeV, and PT2 > 5 GeV.

B Physics: QCD Monte Carlo Model Predictions · Rick Field & Keith Ellis Run 2 Workshop –...

Documents

Transcript of B Physics: QCD Monte Carlo Model Predictions · Rick Field & Keith Ellis Run 2 Workshop –...

Lattice QCD: Looking inside hadrons with computers · 2004. 12. 26. · Lattice QCD: Looking inside hadrons with computers Introduction QCD and lattice QCD lattice QCD and computers

Laboratoire de Physique Théorique d’Oran (LPTO ... · Predictions for the isolated diphoton production through NNLO in QCD and comparison to the 8 TeV ATLAS data Bouzid BOUSSAHA,

NLO QCD calculations, part II€¦ · State of the art of QCD predictions for Higgs boson production at hadron colliders process σNLO,NNLO (by) gg → H HIGLU MCFM MC@NLO,POWHEG

NLO QCD predictions for ttbb production in association ...

The recent revolution in NLO QCD predictions for the LHC - Physics … · 2012-02-17 · L. Dixon NLO QCD for LHC LBL RPM Feb. 16 2012 3 The Large Hadron Collider • Proton-proton

Multi-jet physics with BlackHat · BlackHat •Efﬁcient evaluation of one-loop QCD amplitudes (traditionally the hardest aspect of NLO predictions) •Implementation of modern generalized

Heavy hadron interactions from Lattice QCD · Daniel Mohler (HIM) Heavy hadron interactions from Lattice QCD Wien, Sep 14th, 2017 3 / 29(2002) cc – Recent Lattice QCD predictions

QCD and Monte Carlo simulation VI

Auxiliary field Monte-Carlo study of the QCD phase diagram ...

Topology and QCD axion’s properties from lattice hot QCD ...

Quantum Monte Carlo, Monte Carlo, keeping up with the HPC Evolution Jeongnim Kim1,2, Kenneth P Esler1 ... • Ample opportunities of parallelism QMC has enabled accurate predictions

Deliverablesobservables what we learn requirementscomments/competition HP13 (2015) Test unique QCD predictions for relations between single-transverse.

Lattice QCD and the QCD Vacuum Structure

Effects of bulk symmetry breaking on AdS/QCD predictions

Lecture 11-12 - Duke Universitywebhome.phy.duke.edu/~goshaw/Lecture11-12_2017_V3.pdf · 2017. 10. 10. · Lecture 11-12 October 5 , 2017 Exploring SM QCD predictions Dissecting the

The The AdS AdS/QCD /QCD correspondencecorrespondence …web.phys.ntu.edu.tw/string/files2010Mar/20110610Jugeau.pdfThe The AdS AdS/QCD /QCD correspondencecorrespondence and the and

Monte Carlo Generators and Soft QCD - Lu

QCD and Monte Carlo 3. Jets, Parton Shower MC...Monte-Carlo Method Suppose you start your shower from a con guration in (t 1;x 1). De ne a scale Q2 at which your spacelike shower will

VERA Application within Westinghouse - CASL Meetings · 2019. 4. 10. · VERA-CS, Monte Carlo predictions, and ANC/PARAGON, reinforcing confidence in the startup predictions. HFP

Theoretical Predictions for Exotic Hadrons/67531/metadc678912/... · The most exciting developments in QCD spectroscopy involve searches for resonances which are external to the conventional