Di-hadron correlation in DIS based on e+p pythia data

Outline

• Introduction

• ∆φand ∆y distribution of charged pions

• Leading particle rapidity, pt, θ .

• Pair production

• Conclusion

Introduction• Di-jet processes in DIS are very interesting.Di-jet processes in DIS are very interesting.

• We choose one final hadron with the highest pt as the leading particle iWe choose one final hadron with the highest pt as the leading particle in one jet and make combinations with the other hadrons in the final stan one jet and make combinations with the other hadrons in the final state (mostly charged pion).te (mostly charged pion).

• The di-hadron production provides the most direct method of measurinThe di-hadron production provides the most direct method of measuring the underlying quark scattering mechanism.g the underlying quark scattering mechanism.

• Major pythia files which we focus on are e+p 10+250, 30+325 1MeventMajor pythia files which we focus on are e+p 10+250, 30+325 1Mevents without radiative correction. As a comparison, we also look into the es without radiative correction. As a comparison, we also look into the energy of 27+920.nergy of 27+920.

QCD Compton Boson Gluon Fusion

∆φ and ∆y distribution

Leading particle(with highest pt in every event)

We are trying to look into the charged pions generated by the di-jet process. Pt, Q2 and acceptance cuts are also taken into consideration.

Q2 vs x for pions with and without pt cuts

Q2 vs x for 10+250

2GeV / c

1GeV / c

triggerT

trigger associateT T

p

p p

Assume the detector acceptance is 170°

>θ>10°

2GeV / c

1GeV / c

triggerT

trigger associateT T

p

p p

Q2 vs x for 30+325

170°>θ>10°

2GeV / c

1GeV / c

triggerT

trigger associateT T

p

p p

2GeV / c

1GeV / c

triggerT

trigger associateT T

p

p p

∆φ distribution

30+325 27+920

10+250

2 2Q 1GeV

2GeV / c

1GeV / c

triggerT

trigger associateT T

p

p p

2 2Q 1GeV

LODIS PGF QCDC

2GeV / c

1GeV / c

triggerT

trigger associateT T

p

p p

2 2Q 1GeV170°>θ>10°(|η|<2.44)

10+250GeV

2GeV / c

1GeV / c

triggerT

trigger associateT T

p

p p

2 2Q 1GeV

LODIS

170°>θ>10°(|η|<2.44)

10+250GeV

∆y distribution

10+250

27+92030+325

2 2Q 1GeV2GeV / c

1GeV / c

triggerT

trigger associateT T

p

p p

∆y vs ∆φ

30+325 27+920

10+250

2 /

1 /

triggerT

trigger associateT T

p GeV c

p p GeV c

Leading particle with highest pt

Pt of particle with highest

pt

30+325 27+920

10+250

Rapidity of particle with highest pt

30+325

10+250

27+920

Rapidity of trigger particle

with pt cut2GeV / ctrigger

Tp

30+325 27+920

10+250

Rapidity vs pt of leading particle10+250

With acceptance cut for 170°>θ>10°

Rapidity vs pt of leading particle30+325

With acceptance cut for 170°>θ>10°

θ vs pt of the particle with h

ighest pt

30+325 27+920

10+250

θ vs p of leading particle

30+325

10+250

27+920

Pair production

Kinematics

Pair rapidity,pt,M2 distribution for

10+250

Pair rapidity,pt,M2 distribution for

10+2502GeV / c

1GeV / c

triggerT

trigger associateT T

p

p p

∆φ vs pt pair2GeV / c, 1GeV / ctrigger trigger associate

T T Tp p p

Conclusion

• From the di-hadron correlation in DIS of e+p collision we can get some valuable information of the underlying dijet process

• Try to look into the di-hadron correlation in e+A collisions in the future

Back up

Rapidity correlation

2

1

triggerT

trigger associateT T

p GeV

p p GeV

2

1

triggerT

trigger associateT T

p GeV

p p GeV

2 2Q 1GeV

Delta phi distribution at higher Q2

2 2Q 1GeV 2 2Q 5GeV

2 2Q 10GeV 2 2Q 15GeV