Near Term Physics Goals-Run15 - PowerPoint Presentation

Slide1

Near Term Physics

Goals-Run15

in relation to The long Term Goals

Slide2

Key measurements for polarized pp scattering

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

2

deliverables

observables

what we learn

requirements

comments/competition

HP13 (2015)

Test unique QCD predictions for relations between single-transverse spin phenomena in p-p scattering and those observed in deep-inelastic lepton scattering.

A

N

for

g

,

W

+/-

,Z

0

, DY

Do TMD factorization proofs hold. Are the assumptions of ISI and FSI color interactions in

pQCD

are attractive and repulsive, respectively correct

high luminosity trans pol

pp

at √s=500

GeV

DY: needs instrumentation to suppress QCD

backgr

. by 10

6

at 3<y<4

A

N

DY: >=2020 might be to late in view of COMPASS

A

N

W,Z: can be done earlier, i.e. 2016

HP13 (2015)

and flavor separation

A

N

for

g

,

charged identified(?) hadrons, jets and

diffractive events in

pp

and pHe-3

underlying

subprocess

causing the big A

N

at high

x

f

and y

high luminosity trans pol

pp

at √s=200

GeV

, (500

GeV

jets ?)

He-3:

2 more snakes; He-3

polarimetry

; full Phase-II RP

the origin of

the big A

N

at high

x

f

and y

is a legacy of

pp

and can only be solved in

pp

what are the minimal observables needed to separate different underlying

subprocesses

transversity

and

collins

FF

IFF and A

UT

for

collins

observables

, i.e. hadron in jet modulations

A

TT

for DY

TMD evolution and

transversity

at high x

cleanest probe, sea quarks

high luminosity trans pol

pp

at √s=200

GeV

& 500

GeV

how does our kinematic reach at high x compare with Jlab12

A

TT

unique to RHIC

flavour

separated

helicity

PDFs

polarization dependent FF

A

LL

for jets, di-jets, h/

g

-jets at

rapidities

> 1

D

LL

for hyperons

D

g(x) at small x

D

s(x) and does polarization effect fragmentation

high luminosity long. pol

pp

at √s=500

GeV

Forward instrumentation which allows to measure jets and hyperons.

Instrumentation to measure the relative luminosity to very high precision

eRHIC

will do this

cleaner and with a wider kinematic coverage

Searches for a

gluonic

bound state in central exclusive diffraction

in

pp

PWA of the invariant mass spectrum in

pp



p’M

X

p

’ in

central exclusive production

can exotics, i.e. glue balls, be seen in

pp

high luminosity

pp

at √s=200

GeV

& 500

GeV

full Phase-II RP

how does this program compare to Belle-II & PANDA

Slide3

Key measurements for p↑A scattering

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

3

deliverables

observables

what we learn

requirements

comments/competition

DM8 (2012)

determine low-x gluon densities via p(d) A

direct photon

potentially correlations, i.e. photon-jet

initial state g(x) for AA-collisions

A-scan

LHC and inclusive DIS in

eA

eA

: clean

parton

kinematics

LHC wider/different kinematic reach; NA61

impact parameter dependent g(

x,b

)

c.s

. as

fct

. of t for VM production in UPC (

pA

or AA)

initial state g(

x,b

) for AA-collisions

high luminosity,

clean UPC trigger

LHC and exclusive VM production in

eA

eA

: clean

parton

kinematics

LHC wider/different kinematic reach

“

saturation physics

”

di-hadron correlations

,

g

-jet, h-jet & NLO DY,

diffraction

pT

broadening for J/

Ψ

& DY -

>

Q

s

is the initial state for AA collisions saturated

measurement of the different gluon distributions CNM vs. WW

capability to measure many observables precisely

large rapidity coverage to very forward

rapidities

polarized

pA

A scan

complementary to

eA

, tests universality between

pA

and

eA

CNM effects

R

pA

for many different final states K

0

, p, K, D

0

,

J/

Ψ

,

.. as

fct

of rapidity and collision geometry

is fragmentation modified in CNM

heavy quarks vs. light quarks in CNM

A scan

to tag charm in forward direction



m

-vertex

separation of initial and final state effects only possible in

eA

long range

rapidty

correlations

“ridge”

two-particle correlation at large pseudo-rapidity

Dh

do these correlations also exist in

pA

as in AA

tracking and

calorimetry

to very high

rapidities

interesting to see the √s dependence of this effect compared to LHC

is GPD

E

g

different from zero

A

UT

for

J/

Ψ

through UPC

Ap

↑

GPD

E

g

is responsible for

L

g

 first glimpse

unique to RHIC till EIC turns on

underlying

subprocess

for A

N

(

p

0

)

A

N

for

p

0

and

g

underlying

subprocess

for A

N

(

p

0

)

sensitivity to Q

s

good

p

0

and

g

reconstruction at forward

rapidities

resolving a legacy in transversely polarized

pp

collisions

Slide4

Request in 2013 BUR

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

4

Slide5

Physics in 2015+ for h>1

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

5

(un-)polarized pp

(un-)polarized pA

unravel the underlying

subprocesses causing AN measure the sign change for the Sivers fct. between pp and SIDIS measure DG at low xcentral and forward diffractive production in p(↑)p, p(↑)Aelastic scattering in p(↑)p(↑)

study saturation effects measure gA(x,Q2) and gA(x,Q2,b) unravel the underlying subprocess causing AN study GPDs

what equipment do we need

STAR: main detector and

endcap

refurbished FMS

Preshower

detector in front of the

FMS

 talk Akio Sunday

Roman Pot upgrade to Phase-II

Slide6

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

6

How well can we do on the physics

with this upgrades

Slide7

Helicity Structure

7

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

Can

DS

and

D

G

explain it all ?

Slide8

Gluon contribution to the Spin of the Proton

8

Data ≤ 2009

at 200

GeV

yieldfirst time a significantnon-zero Dg(x)

Can we improve ?

YESadd 510 GeV (12+13)and more 200 GeV (15)data

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

2013 500

GeV

2015 200

GeV

Dc

2=2%

Slide9

DG at low x

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

9

Many different mid-rapidity probes, but not sensitive to low-x.

Mid–Rapidity, Single

π0

<xg>~0.01 for π0 <xg>~0.001 for π0- π0

Fwd

–

Rapidity (3.1<

h

<3.9), 500 GeV

Unfortunately, rate drops by x10 for fwd-mid, and x100 for fwd-fwdRelative Lumi needs to be controlled super well

π0

π0-π0

GSC

DSSV

W.

Vogelsang

NLO

A

LL

p

0

Slide10

Physics with Transverse Beam Polarisation

10

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

Slide11

Quantum tomography of the nucleon

2D+1 picture in momentum space 2D+1 picture in coordinate space transverse momentum generalized parton distributions dependent distributions  exclusive reaction like DVCS

11

Quarks

u

npolarised

polarised

Join the real 3D experience !!

TMDs

GPDs

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

Physics, which gave

Jlab

the 12

GeV

upgrade

and is part of the motivation for

eRHIC

Slide12

Theory: TMDs vs. Twist-3

12

Q

L

QCD

QT/PT

<<

<<

Q

T

/P

T

Collinear/

twist-

3

Q,Q

T

>>

LQCDpT~Q

TransversemomentumdependentQ>>QT>=LQCDQ>>pT

Intermediate QTQ>>QT/pT>>LQCD

Sivers

fct.

Efremov

,

Teryaev;Qiu, Sterman

Need 2 scalesQ2 and ptRemember pp:most observables one scaleException:DY, W/Z-production

Need only 1 scaleQ2 or ptBut should be of reasonable sizeshould be applicable to most pp observables AN(p0/g/jet)

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

Slide13

The famous sign change of the Sivers fct.

13

DIS: gq-scatteringattractive FSI

pp: qqbar-anhilationrepulsive ISI

QCD:

Sivers

DIS = - SiversDY or SiversW or SiversZ0

critical test for our understanding of TMD’s and TMD factorizationTwist-3 formalism predicts the same

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

For details on A

N DY and W/Z see talks this afternoon

A

N

(direct photon) measures the sign change through Twist-3

Slide14

Transverse PHYSICS: What else do we know

Collins / Transversity:conserve universality in hadron hadron interactionsFFunf = - FFfav and du ~ -2dd evolve ala DGLAP, but soft because no gluon contribution (i.e. non-singlet)TMDs Sivers, Boer Mulders, ….do not conserve universality in hadron hadron interactionskt evolution  is strongtill now most predictions did not account for evolutionwrong theory approach for hadrons in final stateu and d Sivers fct. opposite sign d >~ uSivers and twist-3 qq and qg correlators are correlatedglobal fits find sign mismatch, if they assume AN is complete caused by Sivers like effect possible explanations, like node in kt or x don’t work

14

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

Slide15

AN: How to get to THE underlying Physics

15

SIVERS/Twist-3

Collins Mechanism

A

N

for jets AN for direct photonsAN for heavy flavour  gluon

asymmetry in jet fragmentationp+/-p0 azimuthal distribution in jetsInterference fragmentation function

AN for p0 and eta with increased pt coverage

Rapidity dependence of

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

Sensitive to proton spin – parton transverse motion correlationsnot universal between SIDIS & pp

S

P

p

p

S

q

k

T,

π

Sensitive

to

transversity

universal between SIDIS &

pp

&

e+e

-

S

P

k

T,q

p

p

Goal: measure less inclusive

Slide16

What Can be achieved in RUN 15 p↑p↑

16

SIVERS/Twist-3

Collins Mechanism

Interference fragmentation function

A

N

for direct photons

assumes

preshower in front of FMS

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

Slide17

Transversely Polarized Proton MC

Collins with positivity bounds as input

Also developed:

Fast smearing generator

tool to smear generator particle responses in p and energy and to include PID responses, “detectors” can be flexible defined in the acceptance.allows for fast studies of detector effects on physics observablescurrently all eSTAR used smearing parameterizations are implemented

Developed by Tom Burton (https://code.google.com/p/tppmc/) Sivers and Collins asymmetries included IFF and AN(DY/W) need to be still included

Sivers

Mechanism

E.C. Aschenauer

17

pp-pA-LoI f2f, January 2014

Slide18

Hints for Gluon Sivers /Twist-3

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

18

Mid Rapidity

A

N

(p0) dominated by gg and qg

no hint of a

non-zeroAN(p0), AN(J/Ψ)andAN(jet)gluon Sivers ~ 0Twist-3 gg correlator ~0 ?

Forward Rapidity AN(J/Ψ) only gg:

PHENIX200 GeV

p

T

[

GeV

/c]

Mid Rapidity

A

N

(

jet

)

mainly

gg

&

qg

Slide19

ANDY: Hcal and Ecal at h>3

pp-pA-LoI f2f, January 2014

19

E.C. Aschenauer

2013 Final configuration

2011 Configuration

Determine

A

N

(jet) at same rapidity of big AN(p0) h>3 RUN-11: ANDY collected ~ 6.5/pb

Remember:

Theory: arXiv

:1103.1591

A

N(jet)

from p+pp

“

old

” Sivers function SIDIS fit

“

new” Sivers function SIDIS fit

s=200 GeV

arXiv

:

1304.1454

Twist-3 “

Sivers

”

seems not to be the explanation for the big forward A

N

(

p

)

Slide20

Processes with Tagged Forward Protons

pp-pA-LoI f2f, January 2014

20

p + p  p + X + pdiffractive X= particles, glueballs

p + p



p + p elastic

QCD color singlet exchange: C=+1(IP), C=-1(Ο)

p + p

 p + X SDD

pQCD

Picture

Gluonic

exchanges

Discovery Physics

E.C. Aschenauer

Slide21

Central Exclusive Production in DPE

pp-pA-LoI f2f, January 2014

21

In the double Pomeron exchange process each proton “emits” a Pomeron and the two Pomerons interact producing a massive system MXwhere MX =  c(b), qq(jets), H(Higgs boson), gg(glueballs)The massive system could form resonances. We expect that because of the constraints provided by the double Pomeron interaction, glueballs, hybrids, and other states coupling preferentially to gluons, will be produced with much reduced backgrounds compared to standard hadronic production processes.

p

p

M

x

For each proton vertex one has

t

four-momentum transfer



p/p

M

X

=√

s invariant mass

Method is complementary to:

GLUEX experiment (2015)PANDA experiment (>2015)COMPASS experiment (taking data)

E.C. Aschenauer

Slide22

Run 2009 – proof of principle: Tagging forward proton is crucial

pp-pA-LoI f2f, January 2014

22

Note small like sign background after momentum conservation cut

E.C. Aschenauer

Slide23

Forward Proton Tagging

UPGrate

Follow PAC recommendation to develop a solution to run pp2pp@STAR with std. physics data taking  No special b* running any moreshould cover wide range in t  RPs at 15m & 17mStaged implementationPhase I (currently installed): low-t coveragePhase II (proposed) : for larger-t coverage1st step reuse Phase I RP at new location only in y full phase-II: new bigger acceptance RPs & add RP in x-directionfull coverage in φ not possible due to machine constraints Good acceptance also for spectator protons from deuterium and He-3 collisions

at 15-17m

at 55-58m

23

full Phase-II

Phase-II: 1

st

step

1

st

step

W.

Guryn

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

Slide24

“

Spectator

”

proton from deuteron with the current RHIC optics

Rigidity (d:p =2:1)The same RP configuration with the current RHIC optics (at z ~ 15m between DX and D0)needs full PHASE-II RP

Accepted in RP

Passed DX aperture

generated

24

pp-pA-LoI f2f, January 2014

Study: JH Lee

E.C. Aschenauer

Slide25

Spectator proton from

3

He with the current RHIC optics

The

same RP configuration with the current RHIC optics (at z ~ 15m between DX-D0) Acceptance ~ 92% with full PHASE-II RP

Accepted in RP

Passed DX aperture

generated

Momentum smearing mainly due

to Fermi motion + Lorentz boost

Angle [rad]

25

Study: JH Lee

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

Slide26

26

The Beauty of RHICmix and match beams as one likespolarised p↑A unravel the underlying sub-processes to ANgetting the first glimpse of GPD E for gluonsAUT(J/ψ) in p↑A

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

Slide27

Generalized Parton Distributions

E.C. Aschenauer

27

the way to 3d imaging of the proton and the orbital angular momentum Lq & Lg

GPDs:

Correlated

quark momentum

and helicity distributions in transverse space

Spin-Sum-Rule in PRF:

f

rom

g

1

e’

(Q

2

)

e

g

L

*

x+ξ

x-ξ

H, H, E, E (

x,ξ,t

)

~

~

g

p

p

’

t

Measure them through exclusive reactions

golden channel:

DVCS

responsible for orbital angular momentum

pp-pA-LoI f2f, January 2014

Slide28

From ep tO pp to g p/A

28

Get quasi-real photon from one proton/nucleiEnsure dominance of g from one identified proton by selecting very small t1, while t2 of “typical hadronic size” small t1  large impact parameter b (UPC)

Final state lepton pair not from g* but from J/ψ Done already in AuAuEstimates for J/ψ (hep-ph/0310223)transverse target spin asymmetry  calculable with GPDsinformation on helicity-flip distribution E for gluons golden measurement for eRHIC

Gain in statistics doing polarized

p↑A

~Z

2

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

Slide29

From ep tO pp to g A

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

29

SIGNAL

BACKGROUND

t spectrum for beam generating

g

t spectrum for target beam

RP-Veto

Request RP

Simulation: planned 2015

p↑A

run will give

1000 exclusive J/

Ψs

enough to measure A

UT

to see it is different from zero

Slide30

Saturation

Hard diffraction

E.C. Aschenauer

30

Diffraction in

p+A:coherent diffraction (nuclei intact)breakup into nucleons (nucleons intact)incoherent diffractionPredictions: σdiff/σtot in e+A ~25-40%HERA: 15% of all events are hard diffractive

Why is diffraction so important

Sensitive to

spatial

gluon distributionHot topic:Lumpiness?Just Wood-Saxon+nucleon g(b)Incoherent case: measure fluctuations/lumpiness in gA(b)VM: Sensitive to gluon momentum distributionss ~ g(x,Q2)2

pp-pA-LoI f2f, January 2014

Slide31

Diffractive Physics

E.C. Aschenauer

31

Adrian

Dumitru

To be sure it was diffraction need to make sure p and/or A are intact RP and ZDCneed to look seriously into rapidity gap triggersBig Question:Does the diffractive cross section increase in pA if we are saturated regime like in eA?Current answer is YES

pp-pA-LoI f2f, January 2014

Slide32

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

32

NSAC performance

milestones

for

pA / AA

RpA for photonsRpA for J/Ψwill do the trick

Can UPC in

pA

gives us

g

(

x,b

)

Slide33

Exclusive Vector Meson Production

E.C. Aschenauer

33

Unique probe - allows to measure momentum transfer t in pA diffraction in general, one cannot detect the outgoing nucleus and its momentum

Dipole Cross-Section:

J/

ψ

ϕ

small size (J/

Ψ

)

: cuts off saturation region

large size (φ,ρ, ...): “sees more of dipole amplitude” → more sensitive to saturation

pp-pA-LoI f2f, January 2014

STAR Preliminary

Au+Au

UPC



*+

Au

Au

+



Slide34

Spatial Gluon Distribution Through Diffraction

34

Idea: momentum transfer t conjugate to transverse position (bT) coherent part probes “shape of black disc”incoherent part (dominant at large t) sensitive to “lumpiness” of the source (fluctuations, hot spots, ...)

Spatial source distribution:

t = Δ2/(1-x) ≈ Δ2 (for small x)

ϕ, nosat

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

Slide35

Physics Objectives

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

35

Improve lepton-photon-hadron separation in the FMS to doSome examplesJ/Ψ physics in pAu and pp at forward rapidities  RdAcurrent status from chris perkins from run-08

need to simulate J/

Ψ

signal to background

with the FMS

preshower

Slide36

Do Gluons Saturate

E.C. Aschenauer

36

small

x

large

x

x

=1

x

=10

-5

Gluon density dominates at x<0.1

QCD

FIT

Gluon density dominates at x<0.1

Rapid rise in gluons described naturally by linear

pQCD

evolution equations

This

rise cannot increase forever - limits on the cross-

section



non

-linear

pQCD evolution equations provide a natural way to tame this growth and lead to a saturation of gluons, characterised by the saturation scale Q2s(x)

pp-pA-LoI f2f, January 2014

Slide37

pA vs. dA

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

37

pA

will resolve the question the double interaction mechanism plays a role in dA

Hopefully get this time a result which will be published

2008:

44 nb

-12015: 300 nb-1 factor 6 increase

inclusive s(p0) ~ 1/pT6 going to pTtrig>3 GeV luminosity needs to be increased by 11increased FMS + STAR triggering performanceshould be able to go in and out of saturation regime

Slide38

AN in p↑A or Shooting Spin Through CGC

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

38

Y. Kovchegov et al.arXiv:1201.5890

r=1.4fm

r=2fm

strong suppression of

odderon

STSA

in

nuclei.

r=1fm

Q

s

=1GeV

Very unique RHIC possibility p↑ASynergy between CGC based theory and transverse spin physicsAN(direct photon) = 0The asymmetry is larger for peripheral collisions

STAR: projection for upcoming pA runCurves: Feng & Kang arXiv:1106.1375solid: Qsp = 1 GeVdashed: Qsp = 0.5 GeV

p

0

Slide39

Summary

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

39

Carl’s

✔

✔

✔

✔

✔ may be

2015

pp

/

pA

run gets us started

on many physics topics

to be discussed in the

pp-pA-LoI

Slide40

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

40

BACKUP

Slide41

Study BY Len on IMPACT ON FMS photon reconstruction

41

Use FCS simulation using only the clusters and tracks within the FMS geometry at 200 GeV. Photon reconstruction efficiency (~100%) and π0-ϒ separation are comparable under 80 GeV for the FMS and the FCS EMCal. Energy resolution is better for the FCS. This has not been adjusted for the current estimate because the AN measurement is not very sensitive to the smearing in energy scale.

The charged track detection efficiency is set at 86%, per Akio

’s study of the FMS pre-shower model, which showed that the first layer can be used to accept 98% of the photons and reject 86% of the charged hadrons.

SET-UP used:

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

Slide42

200 GeV pAu: UPC kinematics

E.C. Aschenauer

42

all cuts

no cuts

Adding cut by cut:

leptons without cuts

m2: -1 < h < 2m1 and m2: -1 < h < 2t1>-0.016 and -0.2<t2<-0.016

Au

Au’

p

p

’

pp-pA-LoI f2f, January 2014

Slide43

200 GeV pAu: Decay kinematics

E.C. Aschenauer

43

Adding cut by cut:

leptons without cutsm2: -1 < h < 2m1 and m2: -1 < h < 2t1>-0.016 and -0.2<t2<-0.016J/Ψ reconstructed through e+e- and/or m+m- channels

Au

Au’

p

p

’

black

p

p

’

Au

Au’

magenta

all cuts

pp-pA-LoI f2f, January 2014

Slide44

What pHe3 can teach us

Polarized He3 is an effective neutron target  d-quark targetPolarized protons are an effective u-quark target

44

Therefore combining

pp and pHe3 data will allow a full quark flavor separation u, d, ubar, dbar

Two physics trusts for a polarized pHe3 program:Measuring the sea quark helicity distributions through W-productionAccess to DdbarCaveat maximum beam energy for He3: 166 GeVNeed increased luminosity to compensate for lower W-cross sectionMeasuring single spin asymmetries AN for pion production and Drell-Yanexpectations for AN (pions)similar effect for π± (π0 unchanged)

3

He: helpful input for understanding of transverse spin phenomena

Critical to tag spectator protons from 3He with roman pots

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

Slide45

ALW: Future Possibilities

E.C. Aschenauer

45

Can we increase p-beam energy?325 GeV: factor 2 in sW BUT despite the original design of magnets can only got to 10% more  275 GeVIncreased beam-energy and polarized He-3 beam  full flavor separation

A

L

W

: pp @ 500

GeV

A

L

W

:

He3-p @ 432

GeV

phase 2 of pp2pp@STAR can separate scattering on

n

or

p

polarised He-Beams had a a workshop to discuss possibilitieshttps://indico.bnl.gov/conferenceDisplay.py?confId=405 no show stoppers, but need most likely one additional pair of snakes increase luminosity of RHIC

pp-pA-LoI f2f, January 2014

Slide46

rates: pp vs 3He p collisions

46

1

st rough estimate (Vogelsang): not too bad, about a factor of 4-5 in

dσ (bin) [pb]

W+

pT > 20 GeV

pp @ 500

p 3He @ 332

y

rate is per nucleoni.e. scaled by 1/A

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

Slide47

what do we mean by “Direct”….

p

0

Prompt

“Fragmentation”

much better called internal

bremsstrahlung

Induced

EM & Weak Decay

proton – proton:

g

Fragmentation

Au – Au or

d

-Au

Thermal Radiation

QGP

/

Hadron

Gas

De-excitation

for excited

states

(1)

(2)

(3)

(4)

(5)

(6)

E.C. Aschenauer

pp-pA-LoI f2f, January 2014

47

Slide48

What is in Pythia 6.4

pp-pA-LoI f2f, January 2014

48

Processes included which would fall under prompt (1)14: qqbar  gg18: qqbar  gg (19: qqbar  gZ0 20: qqbar  gW+ 29: qg  qg 114: gg  gg 115: gg  gg (106: gg  J/Psig 116: gg  Z0g )initial and final internal bremsstrahlung (g and g) (3)Pythia manual section 2.2Process 3 and 4 are for sure not in pythiaI’m still checking 5the decay of resonances like the p0 is of course in pythia

E.C. Aschenauer

Slide49

Collected Luminosity with longitudinal Polarization

49

YearÖs [GeV]Recorded PHENIXRecordedSTARPol [%]2002 (Run 2) 200/0.3 pb-1152003 (Run 3) 2000.35 pb-10.3 pb-1272004 (Run 4)2000.12 pb-10.4 pb-1402005 (Run 5)2003.4 pb-13.1 pb-1492006 (Run 6)2007.5 pb-16.8 pb-1572006 (Run 6)62.40.08 pb-1482009 (Run9)50010 pb-110 pb-1392009 (Run9)20014 pb-125 pb-1552011 (Run11)50027.5 / 9.5pb-1 12 pb-1482012 (Run12)50030 / 15 pb-182 pb-150/54

E.C. Aschenauer

High Energy Physics in the LHC era, Chile, December 2013

Slide50

Collected Luminosity with transverse Polarization

50

YearÖs [GeV]Recorded PHENIXRecordedSTARPol [%]2001 (Run 2)2000.15 pb-10.15 pb-1152003 (Run 3)200/0.25 pb-1302005 (Run 5)2000.16 pb-10.1 pb-1472006 (Run 6)2002.7 pb-18.5 pb-1572006 (Run 6)62.40.02 pb-1 532008 (Run8)2005.2 pb-17.8 pb-1452011 (Run11)500/25 pb-1482012 (Run12)2009.2/4.3 pb-122 pb-161/58

E.C. Aschenauer

High Energy Physics in the LHC era, Chile, December 2013