IHEP Atlas Week June 2008

Atlas Physics Analysis Plan at UTDallas

Xinchou LouUniversity of Texas at Dallas

UTD Group on Atlas

Physics Topics and Ideas

Monte Carlo Simulation Study

Plan for Physics Analysis

IHEP Atlas Week June 2008

UT Dallas Group ■ Faculty

Joe Izen and Xinchou Lou

■ Staff and Studentspostdocs – Eugene Galyaev, H Mashanasystem adm – Donald Mooregraduate students –

Masa Kondo, Wei Cheng Wong, Brandom Drummond

■ Participation in AtlasPixel DetectorTier 3 Computing & GridPhysics

IHEP Atlas Week June 2008

Physics Interests and Ideas

■ Xc,Yc, & Zc (Xb, Yb, & Zb) states at LHC

map out Xc, Yc, & Zc and similar statesdiscover new Xb,Yb, & Zb states unveil new spectroscopy of hadrons?

■ Bs Physics

■ The Higgs in Hadronic Modes

EM & hadronic calorimetry

IHEP Atlas Week June 2008

Beyond the Quark Model of Mesons

The discovery and identification of a new spectroscopy

seems close

Xc,Yc,Zc → J/ or

with contentcc

DD

Basically all states below the open charm threshold are observed and explained;

X, Y & Z do not fit in.

R. Faccini, LP07

M(M

eV

)

JPC

(2S+1)LJ

Open charm thr. (3770)

(4040)

(4160)

(pot. Models)c

’c

J/

’ c2 c1

c0

hc

X Z

X,Y(4415)

Yet another particle: X(4160) [c(3S)?]

IHEP Atlas Week June 2008

Production of the and the Upsilon States (possibly Xc/b, Yc/b, Zc/b )

rates are NOT known for Xc/b, Yc/b, Zc/b at LHC

Heavy Q Prod in hadron-hadron

Leading Order

Next to LO

CDF, DØ Run I

10% charm hidden (G. A. Schuler)

IHEP Atlas Week June 2008

Production of the States at LHC

J. Campbell et. al.

rates are NOT known for Xc/b, Yc/b, Zc/b at LHC

IHEP Atlas Week June 2008

Production of the Upsilon States at LHC

J. Campbell et. al.

rates are NOT known for Xc/b, Yc/b, Zc/b at LHC

IHEP Atlas Week June 2008

MC Simulation of Yc,b (J/ or (nS))

From Wei Cheng Wong 8

• Generate Ψ(2S) -> J/Ψ ππ using Pythia 6.4– Physics: pp -> gg -> c c-bar (J/Ψ, replaced by Ψ(2S)) g, and Ψ(2S) -> J/Ψ ππ.– Modify the JobOption file to use with Pythia 6.4 on lxplus. – Change the KFPR type to produce Ψ(2S) instead of J/Ψ.– Change the MDME type to turn on Ψ(2S) -> J/Ψ ππ, and turn off all other decays.

• Generate Yc(4260) -> J/Ψ ππ

– Physics: pp -> gg -> c c-bar (J/Ψ, replaced by Yc(4260)) g, and Yc(4260) -> J/Ψ ππ.

– Change the PMAS type to set the mass of Ψ(2S) to 4.26 GeV.

– Turn on Ψ(2S) -> J/Ψ ππ only; to produce Yc(4260) -> J/Ψ ππ.

IHEP Atlas Week June 2008

Yc(4260)

π

J/Ψ

From Wei Cheng Wong

IHEP Atlas Week June 2008

10

Similarly we generate a hypothetical b(10.5) ϒ(1S) π+ π-

Yb(10.5)

π

ϒ(1S)

From Wei Cheng Wong

IHEP Atlas Week June 2008

11

To Work on the Grid (Panda)• Running the Full Chain – running batch jobs on lxplus

– Generated 100 events of Yc(4260) -> J/Ψ ππ– Simulation of Atlas, Digitization and Event reconstruction done on lxplus

• Test of code

– Produce the AOD

• Plan to do– Running on the Grid (by using Panda) to produce the AOD files of Yc(4260) and

Yb(10.5) and their decay processes.– Studying the Monte Carlo events with physics analysis code

From Wei Cheng Wong

IHEP Atlas Week June 2008

Summary

UTDallas group just began to look at physics topics

Yc(4260)J/Yb(m)nS

(Wei Cheng Wong) (Masa Kondo)

We will expand the study to hadronic decays of the Bs and the Higgs

Rare Bs decays

Study of hadronic decays of the Higgs

X, Y, Z(4260) D D(*) with detached vertices

Direct charmonia