The Electron Ion Collider Project

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The Electron Ion Collider Project

April 12, 2011

DIS2011, Newport News, VA

Abhay Deshpande

Related Talks:

4/12/2011

Abhay Deshpande Overview of the US EIC Project

2

An

update on
eRHIC

acceleraor

V.
Litvinenko

Design

status of of MEIC at
JLab

V.

Morozov

PDFs today and tomorrow

M.
Stratmann

Theory overview

of e
-
A physics at the EIC

J.

Jalilian
-
Marian

Experimental overview of e
-
A physics

at the EIC

T.

Ullrich

A new Monte

Carlo event generator for
eA

collisions at low
-
x

T.

Toll

Theory overview of
e+p

physics

at an EIC

J.

Qiu

Experimental overview of
e+p

physics at an EIC

H.
Gao

Imaging sea quarks and gluons

at the EIC

T. Horn

Ep

physics opportunities at
eRHIC

T. Burton

Transverse single
-
spin

asymmetry measurement from SIDIS at an EIC

M.

Huang


Weak

mixing angle measurement at EIC

Y.

Li

PHENIX and STAR Detector

Upgrades (for use as Stage 1
eRHIC

detector)

E. O’Brien, J. Dunlop

… And of course, low
-
x physics at
LHeC

is a physics connection

Success of
pQCD

at High Q: Jet Cross section


Input:


F
2
(x,Q
2
) structure function from HERA


Next to Leading
O
rder
perturbative

QCD

4/12/2011

Abhay Deshpande Overview of the US EIC Project

3

Je
t
s
(
p
.
4
)
I
n
t
ro
d
u
c
t
i
o
n
B
a
c
k
g
ro
u
n
d
K
n
o
w
l
e
d
g
e
J
et
s
f
r
o
m
s
cat
t
er
i
ng
o
f
pa
r
t
o
ns
J
e
t
s
a
re
una
v
o
i
da
bl
e
a
t
ha
dro
n
c
o
l
l
i
de
rs
,
e
.
g
.
f
ro
m
pa
rt
o
n
s
c
a
t
-
t
e
ri
ng
p
p
jet
jet
[GeV/c]
JET
T
p
0
100
200
300
400
500
600
700

[
n
b
/
(
G
e
V
/
c
)
]
J
E
T
T

d
p
J
E
T

/

d
y

2
d
-14
10
-11
10
-8
10
-5
10
-2
10
10
4
10
7
10
10
10
D=0.7
T
K
)
-1
CDF data ( L = 1.0 fb
Systematic uncertainties
NLO: JETRAD CTEQ6.1M
corrected to hadron level
0

/ 2 =
JET
T
= max p
F

=
R

PDF uncertainties
)
-6
10
²
|<2.1 (
JET
1.6<|y
)
-3
10
²
|<1.6 (
JET
1.1<|y
|<1.1
JET
0.7<|y
)
3
10
²
|<0.7 (
JET
0.1<|y
)
6
10
²
|<0.1 (
JET
|y
J
e
t
c
ro
s
s
s
e
c
t
i
o
n:
da
t
a
a
nd
t
he
o
ry
a
g
re
e
o
v
e
r
m
a
ny
o
rde
rs
o
f
m
a
g
ni
t
ude

p
ro
b
e
o
f
unde
rl
y
i
ng
i
nt
e
ra
c
t
i
o
n
T
e
v
a
tr
o
n
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
0.2
0.6
1.0
1.4
1.8

1
/
2


d

/
(
d

d
p
T
)

[
p
b
/
G
e
V
]
d
a
t
a

/

t
h
e
o
r
y

[Ge
V/c
]
p
T
10
20
30
40
50
0
2
(a)
(b)
Combined MB
Combined HT
NLO QCD (Vogelsang)
Systematic Uncertainty
Theory Scale Uncertainty
p+p

je
t + X



G
eV
mid
p
oi
n
t-
c
on
e
r

=0.4
0.2
<

<0.8
=20
0
s
co
n
e
ST
A
R
ST
AR, PRL
97 (2006), 252001
RHIC
Inclusive jet
p
T
spectrum
Hard Probes 2010

Hermine K. Wöhri : CMS results in pp collisions

(GeV)
T
p
20
30
100
200
1000

(
p
b
/
G
e
V
)
T
/
d
y
d
p

2
d
-1
10
10
3
10
5
10
7
10
9
10
11
10
1024)
²
|y|<0.5 (
256)
²
|y|<1.0 (

0.5
64)
²
|y|<1.5 (

1.0
16)
²
|y|<2.0 (

1.5
4)
²
|y|<2.5 (

2.0
1)
²
|y|<3.0 (

2.5
NLO pQCD+NP
Exp. uncertainty
= 7 TeV
s
-1
CMS preliminary, 60 nb
R=0.5 PF
T
Anti-k
(GeV)
T
p
20
30
100
200
1000

(
p
b
/
G
e
V
)
T
/
d
y
d
p

2
d
-1
10
10
3
10
5
10
7
10
9
10
11
10
coverage of the full
p
T
range combining
triggers with dif
ferent
thresholds
experimental systematic
uncertainties dominated
by jet energy scale and
resolution, and by the
luminosity measurement
17

!
Extending the high
p
T
limit beyond
T
evatron
reach

!

Accessing the low
p
T
part using dif
ferent
jet reconstruction algorithms

!
Good agreement with NLO predictions
(GeV)
T
p
20
30
100
200
1000
T
r
i
g
g
e
r

E
f
f
i
c
i
e
n
c
y
0
0.2
0.4
0.6
0.8
1
MinBias
Jet6u
Jet15u
Jet30u
= 7 TeV
s
-1
CMS preliminary, 60 nb
|y| < 0.5
R=0.5 PF
T
Anti-k
37
56
84
(GeV)
T
p
20
30
100
200
1000
T
r
i
g
g
e
r

E
f
f
i
c
i
e
n
c
y
0
0.2
0.4
0.6
0.8
1
(GeV)
T
p
20
30
100
200
1000
D
a
t
a

/

T
h
e
o
r
y
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
|y| < 0.5
PF
Theory uncertainty
Exp. uncertainty
ansatz
= 7 TeV
s
-1
CMS preliminary, 60 nb
(GeV)
T
p
20
30
100
200
1000
D
a
t
a

/

T
h
e
o
r
y
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
P
AS QCD-10-01
1
J.
W
eng’
s
talk
G. Martinez’
s talk
K.S.
Grogg’
s
poster
LHC
Compilation: J.
Putschke

QCD definitely correct, but…

Lattice QCD


Starting from QCD
lagrangian



Static properties of hadrons:
hadron mass spectrum

4/12/2011

Abhay Deshpande Overview of the US EIC Project

4


Calculations possible in
perturbation theory
assuming

coupling is small, at high Q


Problematic at low Q


fast rise
of
a
S
(Q)

No guidance on
partonic

dynamics


Do we really “understand” QCD?

While there is no reason to doubt QCD, our level of understanding of
QCD remains extremely unsatisfactory: both at low & high energy



Can we explain basic properties of hadrons such as
mass

and
spin

from the QCD degrees of freedom at
low energy
?


What
are

the effective
degrees of freedom at high energy?


H
ow do these degrees of freedom
interact

with each other and
with other hard probes?


What can we learn from them about
confinement & universal
features

of the theory of QCD?


After ~20+
yrs

of experimental & theoretical progress,
w
e
are only
beginning to understand
the many body dynamics
of QCD

4/12/2011

Abhay Deshpande Overview of the US EIC Project

5

R.
Venugopalan

Generation of Mass


Gluons in QCD


Protons and neutrons form most of the mass of the
visible
universe


99% of the nucleon mass is due to
self generated gluon fields


Similarity

between p, n mass indicates that
gluon dynamics
is
identical

& overwhelmingly important




Lattice QCD supports this


4/12/2011

Abhay Deshpande Overview of the US EIC Project

6

Higgs Mechanism, often
credited with mass
generation, is of no
consequence

Bhagwat

et al.

HOW WELL DO WE
UNDERSTAND GLUONS?

What is the role of gluons at high energy?

4/12/2011

Abhay Deshpande Overview of the US EIC Project

7

Gluon distribution at low
-
x understood?


Indefinite rise


Could this be an
artifact
of using
of
linear

DGLAP in gluon
extraction?


Infinite
high energy hadron cross
section?







How would we find out?


Need theory development


Need experimental measurements at
lower x!

4/12/2011

Abhay Deshpande Overview of the US EIC Project

8

0.2
0.4
0.6
0.8
1
-4
10
-3
10
-2
10
-1
10
1
0.2
0.4
0.6
0.8
1
HERAPDF1.5 (prel.)
exp. uncert.
model uncert.
parametrization uncert.

HERAPDF1.0
x
x
f
2
= 10000 GeV
2
Q
v
xu
v
xd
0.05)

xS (
0.05)

xg (
H
E
R
A

S
t
r
u
c
t
u
r
e

F
u
n
c
t
i
o
n
s

W
o
r
k
i
n
g

G
r
o
u
p
J
u
l
y

2
0
1
0
H1 and ZEUS HERA I+II Combined PDF Fit
0.2
0.4
0.6
0.8
1
0.2
0.4
0.6
0.8
1
-4
10
-3
10
-2
10
-1
10
1
0.2
0.4
0.6
0.8
1
HERAPDF1.0
exp. uncert.
model uncert.
parametrization uncert.

x
x
f
2
= 10 GeV
2
Q
v
xu
v
xd
0.05)

xS (
0.05)

xg (
H1 and ZEUS HERA I Combined PDF Fit
0.2
0.4
0.6
0.8
1
0.2
0.4
0.6
0.8
1
-4
10
-3
10
-2
10
-1
10
1
0.2
0.4
0.6
0.8
1
HERAPDF1.5 (prel.)
exp. uncert.
model uncert.
parametrization uncert.

x
x
f
2
= 2 GeV
2
Q
v
xu
v
xd
0.05)

xS (
0.05)

xg (
H
E
R
A

S
t
r
u
c
t
u
r
e

F
u
n
c
t
i
o
n
s

W
o
r
k
i
n
g

G
r
o
u
p
J
u
l
y

2
0
1
0
H1 and ZEUS HERA I+II Combined PDF Fit
0.2
0.4
0.6
0.8
1
No higher energy e
-
p collider than HERA!


other than “
LHeC


OR




U
se Nuclei: naturally enhance the densities of
partonic

matter

Why not use Nuclear DIS at highest available energy?

Low
-
x
, higher twist & Color Glass Condensate


4/12/2011

Abhay Deshpande Overview of the US EIC Project

9

McLerran
,
Venugopalan
… See Review: F.
Gelis

et al., , arXiv:1002.0333)

Method of including
non
-
linear
effects in DGLAP equation


Small coupling, high gluon densities


Saturation Scale
Q
S
(x,Q
2
,
A
)



Some form of saturation,
including Color Glass Condensate




No unambiguous experimental
evidence yet,
but many smoking
guns (HERA, RHIC

& now LHC!)


Could be explored cleanly in future with a high energy

electron
-
Nucleus Collider

Kowalski

Teany

PRD 68:11400
5


UNDERSTANDING

NUCLEON
SPIN
:

WHAT ROLE DO GLUONS PLAY?

4/12/2011

Abhay Deshpande Overview of the US EIC Project

10

E
volution: Our Understanding of Nucleon Spin

?

1980s

1990/2000s

We have come a long way, but do we understand nucleon spin?

4/12/2011

11

Abhay Deshpande Overview of the US EIC Project

Status of “Nucleon Spin Crisis Puzzle”


We
know

how to determine
DS

and
D
g

precisely:
data+pQCD



½ (
DS
) ~ 0.15 : From fixed target pol. DIS experiments


RHIC
-
Spin:
D
g

not large
as anticipated in the 1990s, but
measurements & precision needed at low
& high x


4/12/2011

Abhay Deshpande Overview of the US EIC Project

12

PHENIX

D
g
(
x) @ Q
2
=10 GeV
2


Global analysis: DIS,
SIDIS, RHIC
-
Spin


Uncertainly on
D

污牧攠at 汯眠
x

4/12/2011

Abhay Deshpande Overview of the US EIC Project

13

d
e
Florian
,
Sassot
,
Stratmann

&
Vogelsang

Present

Low x measurements

=Opportunity!

Status of “Nucleon Spin Crisis Puzzle”


We
know

how to measure
DS

and
D
G precisely using
pQCD



½ (
DS
) ~ 0.15 : From fixed target pol. DIS experiments


RHIC
-
Spin:
D
G
not large
as anticipated in the 1990s, but
measurements & precision needed at low
& high
x



Orbital angular momenta: Generalized Parton Distributions (GPDs):
H,E,E’,H’


Quark GPDs:
12
GeV@JLab & COMPASS@CERN


Gluons @ low x


J
G



will need the future EIC!



W
ould it not be great to have a (2+1)D tomographic image of the
proton…. (
2:
x,y

position
and
+1:momentum in z direction
)?


Transverse Momentum Distributions, GPDs of Quarks & Gluons… full
understanding of transverse and longitudinal hadron structure including spin!

4/12/2011

Abhay Deshpande Overview of the US EIC Project

14

The Proposal:

Future DIS experiment at an Electron Ion
Collider
: A high energy, high luminosity
(polarized)
ep

and
eA

collider and a suitably
designed detector

[2]

[3]

[1]

Measurements:

[1]


Inclusive

[1] and
[2]

or

[3]


Semi
-
Inclusive

[1] and
[2]

and

[3]


Exclusive


Inclusive


Exclusive

Low


High Luminosity

Demanding Detector capabilities


EIC : Basic Parameters


E
e
=
10

GeV

(
5
-
30
GeV

variable)


E
p
=
250

GeV

(
50
-
325
GeV

Variable)


Sqrt(S
ep
) = 100 (30
-
200)
GeV


X
min

= 10
-
4
; Q
2
max
= 10
4

GeV


Beam polarization ~ 70% for
e,p,D
,
3
He


Luminosity
L
ep

= 10
33
-
34

cm
-
2
s
-
1


Minimum
Integrated luminosity:


50 fb
-
1

in 10 yrs (100
x

HERA)


Possible with 10
33

cm
-
2
s
-
1


Recent projections
much higher

Nuclei:


p
-
>U; E
A
=20
-
100 (140)

GeV
/N


Sqrt(S
eA
) = 12
-
63 (75)

GeV


L
eA
/N = 10
33

cm
-
2
s
-
1



4/12/2011

Abhay Deshpande Overview of the US EIC Project

16

Machine Designs

Details in Talks by V.
Litvinenko

& V.
Morozov

eRHIC

at Brookhaven National Laboratory
using the existing RHIC complex


ELIC at Jefferson Laboratory using the
Upgraded 12GeV CEBAF


Both planned to be STAGED

MEIC : Medium Energy EIC

Three compact rings:



3 to 11 GeV electron



Up to 12 GeV/c proton (warm)



Up to 60 GeV/c proton (cold)



low
-
energy IP

polarimetry

medium
-
energy


IPs

4/12/2011

Abhay Deshpande Overview of the US EIC Project

18

Exists

ELIC: High Energy & Staging

Stage

Max. Energy

(GeV/c)

Ring Size

(m)

Ring Type

IP #

p

e

p

e

Medium

96

11

1000

Cold

Warm

3

High

250

20

2500

Cold

Warm

4

Serves as a large booster to
the full energy collider ring

Arc

Straight section

4/12/2011

Abhay Deshpande Overview of the US EIC Project

19

V.N.
Litvinenko


eSTAR

Beam

dump

Polarized

e
-
gun

New

detector

0.6 GeV

30 GeV

27.55 GeV

22.65
GeV

17.75 GeV

12.85
GeV

3.05 GeV

7.95
GeV

100 m

25.1 GeV

20.2 GeV

15.3 GeV

10.4 GeV

30.0 GeV

5.50
GeV

27.55 GeV

eRHIC: polarized electrons with E
e

≤ 30 GeV will collide with

either polarized protons with E
e

≤ 325 GeV or heavy ions E
A

≤ 130 GeV/u

eRHIC staging:

All energies scale
proportionally

Small gap magnets

5 mm gap

0.3 T

@
30 GeV

4/12/2011

Abhay Deshpande
Overview

of
the

US EIC Project

20

4/12/2011

Abhay Deshpande Overview of the US EIC Project

21

nucleus

electron

proton

nucleus

eSTAR

See J. Dunlop’s talk

ePHENIX

See E. O’Brien’s talk

4/10/11

Abhay Deshpande on EIC Collaboration's Perspective

22

Emerging
eRHIC

Detector Concept

4/12/2011

Abhay Deshpande Overview of the US EIC Project

high acceptance
-
5 <
h

< 5 central detector

good PID and vertex resolution (< 5
m
m)

tracking and calorimeter coverage the same


good momentum resolution, lepton PID

low material density


minimal multiple scattering and bremsstrahlung

very forward electron and proton detection


dipole spectrometers

Forward / Backward

Spectrometers:

E.
Aschenauer

et al.

BNL EIC Task Force &

EIC Collaboration

eRHIC

IRs,
β
*=5cm, l*=4.5 m

Up to 30 GeV
e
-

beam

L=1.4x10
34
cm
-
2
s
-
1
,
200 T/m gradient

0.45 m

Star detector

©Dejan Trbojevic

90.m

Exploit LARP development of Nb
3
Sn
SC quads with 200 T/m gradient

Integrated with
“new” detector
design. Field
-
free
electron pass thru
hadron triplet
magnets


minimal
SR background.

IR combined function magnet design

See talk by
Litvinenko’s

solenoid

electron FFQs

50 mrad

0

mrad

ion dipole w/ detectors

electrons

IP

2+3 m

2 m

2 m

Detect particles with
angles
below 0.5
o

beyond ion FFQs and
in arcs.

detectors

Detect particles with
angles
down to 0.5
o

before ion FFQs.

Need 1
-
2 Tm dipole.

Central detector

EM Calorimeter

Hadron Calorimeter

Muon Detector

EM Calorimeter

Solenoid yoke + Muon Detector

TOF

HTCC

RICH

RICH or DIRC/LTCC

Tracking

2m

3m

2m

4
-
5m

Solenoid yoke + Hadronic Calorimeter

Very
-
forward detector

Large dipole bend @ 20 meter from IP

(to correct the 50
mr

ion horizontal crossing angle)

allows for
very
-
small angle detection (<0.3
o
)

Detector & IR Design: ELIC

Nadel
-
Turonski
, Horn,
Ent

And EIC Collaboration

4/12/2011

Abhay Deshpande Overview of the US EIC Project

25

Impact of EIC….

“golden measurements”

Science of EIC:

Institute of Nuclear Theory (INT) Program at U. of Washington:

Sep
-
Nov 2010

Organizers: D. Boer, M. Diehl, R. Milner, R.
Venugopalan
, W.
Vogelsang







See the INT workshop for details of all studies

http://www.int.washington.edu/INT_03/


Details in the EIC talks in this conference….

4/12/2011

Abhay Deshpande Overview of the US EIC Project

26

Summary: Science of EIC:

Precise Investigations of the “Glue”


Study
of extreme high gluon densities
via inclusive and
sem
-
inclusive & diffractive
DIS off a wide range of nuclei
and
energies

Precision measurements
of Sea Quarks and Gluon’s Spin
via
inclusive and semi
-
inclusive DIS including EW probes of the hadron
structure


Measurement of
(gluon)
GPDs & TMDs: via semi
-
inclusive and
exclusive DIS



睩摥dra湧攠i渠砠x湤nQ
2


3D momentum and position (correlations) of the nucleon



Possibly leading to orbital angular momentum



High energy, beam polarization, and a full acceptance detector: why
not explore precision electroweak physics and EW (spin) structure
functions
(will not have time to discuss this today
)
.

4/12/2011

Abhay Deshpande Overview of the US EIC Project

27

Spin program at the EIC:

4/12/2011

Abhay Deshpande Overview of the US EIC Project

28

Science

Deliverable

Basic

Measurement

Uniqueness


Feasibility

Relevance

Requirements

spin

structure at
small
x

contribution of
Δ
g
,
ΔΣ

to spin sum rule

inclusive

DIS



need

to reach
x
=10
-
4


large x,Q
2

coverage

about 10fb
-
1

full flavor separation

in large x,Q
2

range

strangeness,
s(x)
-
s(x
)

polarized sea

semi
-
inclusive
DIS




very similar

to DIS

excellent particle
ID

improved
FFs

(
Belle,LHC
,…)


electroweak probes

of proton structure

flavor

separation

electroweak
parameters

inclusive DIS

at

high Q
2



some unp.

results from
HERA

20x250 to 30x325

positron

beam ?

polarized
3
He
beam ?

M.
Stratmann

Nucleon Spin: Precision measurement of
D
G


4/12/2011

Abhay Deshpande Overview of the US EIC Project

29

Yellow band (left) reduces to the


band shown with
red

dashed line
(right)

Sassot

&
Stratmann

4/12/2011

Abhay Deshpande Overview of the US EIC Project

30

See more in talks by: T.
Ullrich
, J.
Jalilian
-
Marian

C.
Marquet

Nuclear Tomography: (2+1)D images

4/12/2011

Abhay Deshpande Overview of the US EIC Project

31

x < 0.1

x ~ 0.3

x ~ 0.8

Fourier transform in momentum transfer

x ~ 0.001

EIC:

1)
x

< 0.1: gluons
!


2)
x

~ 0


the
“take out” and
“put back” gluons
act coherently.

2)
x

~ 0

x
-

x

x +
x

,g

d

Diffractive vector meson production in
eA

4/12/2011

Abhay Deshpande Overview of the US EIC Project

32

,g

d

See T.
Ullrich’s

talk on

eA

physics at the EIC

Precise transverse imaging of the
gluons proton
-
heavy nuclei

Later, how low x dynamics
modifies this transverse gluon
distribution

Exclusive coherent (at small t)

a
nd incoherent (intermediate t)

Diffraction


Experimental challenges being

Studied.

EIC Project status and plans


A “collaboration” of highly motivated people intends to take this project to realization:


EIC Collaboration
W
eb Page:
http://web.mit.edu/eicc/

BNL:
https://
wiki.bnl.gov
/
eic
/
index.php
/
Main_Page


JLab
:
http://
www.jlab.org
/
meic


100
+
dedicated
physicists from 20+
institutes


Details of many recent studies: Recent Workshop @ INT at U. of Washington
:
http://
www.int.washington.edu/program/INT_03


Task Force at BNL (E.
Aschenaur
, T.
Ullrich
) and at Jefferson Laboratory (R.
Ent
)


Steering Committee (contact: AD and R. Milner)



International Advisory Committee formed by the BNL &
Jlab

Management to steer this
project to realization:
W. Henning (ANL, Chair
), J. Bartels (DESY),A. Caldwell (MPI,
Munich) A. De
Roeck

(CERN), R.
Gerig

(ANL), D.
Hetrzog

(U of W), X.
Ji

(Maryland), R.
Klanner

(Hamburg), A. Mueller (Columbia), S.
Nagaitsev

(FNAL), N. Saito (J
-
PARC), Robert
Tribble

(Texas A&M), U.
Wienands

(SLAC), V.
Shiltev

(FNAL)



Plan to go to the NSAC Long Range Plan (2012/13) with the science case &
machine/detector designs (including costs & realization plans)

4/12/2011

Abhay Deshpande Overview of the US EIC Project

33

Generic Detector R&D for an EIC


Community wide call for R&D Detector proposals for EIC


Program run from BNL (RHIC R&D funds), NOT site specific


Very Recent: Deadline April 4
th
, 2011 (more opportunities in future)


New detector technology for fiber sampling
calorimetry

for EIC and STAR
.

UCLA, Texas A&M, Penn State

Front end readout modules for data acquisition and trigger system
.

Jefferson Lab

DIRC based PID for EIC Central Detector
.


Catholic U. of America, Old Dominion U.,
JLab
, GSI (Darmstadt)

Liquid scintillator calorimeter for the EIC
.

Ohio State U.

Test of improved radiation tolerant silicon
PMTs
.


Jefferson Lab

Letter of Intent for detector R&D towards an EIC detector

(Low mass tracking and PID
).

BNL, Florida Inst. Tech., Iowa State, LBNL, LANL, MIT, RBRC, Stony Brook, U. of Virginia, Yale U.


Exploring possible new technologies & attracting new collaborators….

4/10/11

Abhay Deshpande on EIC Collaboration's Perspective

34

Luminosity upgrade:

Further luminosity
upgrades (pp, low
-
E)

Staged approach to eRHIC

LHC HI starts

RHIC
-
II science by
-
passing RHIC
-
II project

Opportunity for up
-
grade* or 1
st

EIC stage
(eRHIC
-
I)

EIC = Electron
-
Ion Collider;
eRHIC = BNL
realization by
adding e beam to
RHIC

Further luminosity
upgrades (pp, low
-
E)

eRHIC
-
I physics

* New
PHENIX and STAR Decadal Plans provide options for this period.
Dedicated
storage ring for novel charged
-
particle EDM measurements another option.

© V. Litvinenko

eRHIC

will
add electron
ERL inside
RHIC tunnel,
going from 5
to 30
GeV

in
stages

electron
recirc
-
ulation

mag
-
nets

S.
Vigdor
, BNL Associate Director

35

4/12/2011

Abhay Deshpande Overview of the US EIC Project

36

EIC at
JLab

Realization Imagined


Activity Name
2010

2011

2012

2013

2014

2015

2016

2017

2018

2019

2020

2021

2022

2023

2024

2025

12
Gev

Upgrade

FRIB

EIC


Physics Case

NSAC LRP


CD0


Machine


Design/R&D


CD1/
D’nselect


CD2/CD3


Construction

H. Montgomery, Jeff. Laboratory Director

Summary

Science Case for EIC:



“Precision study of the role of gluons & sea quarks in QCD”

M
any body dynamics in QCD is an essential focus of this study.

Possibilities of precision EW & other physics being explored
.


The
EIC Collaboration & the
BNL+Jlab

managements
are moving
(
together
)
towards realization:
NSAC approval 2013


乥硴x䵩M敳e潮o


Machine R&D, detector discussions, simulation studies towards
making the final case including cost considerations needs to occur
within the next two years…


INVITATION:

Ample opportunities to get involved and influence the
design of this machine according to your own physics interests and
participate in the exploration of the “next QCD frontier…”!


4/12/2011

Abhay Deshpande Overview of the US EIC Project

37

Related detailed talks: Reminder…

4/12/2011

Abhay Deshpande Overview of the US EIC Project

38

An

update on
eRHIC

acceleraor

V.
Litvinenko

Design

status of of MEIC at
JLab

V.

Morozov

PDFs today and tomorrow

M.
Stratmann

Theory overview

of e
-
A physics at the EIC

J.

Jalilian
-
Marian

Experimental overview of e
-
A physics

at the EIC

T.

Ullrich

A new Monte

Carlo event generator for
eA

collisions at low
-
x

T.

Toll

Theory overview of
e+p

physics

at an EIC

J.

Qiu

Experimental overview of
e+p

physics at an EIC

H.
Gao

Imaging sea quarks and gluons

at the EIC

T. Horn

Ep

physics opportunities at
eRHIC

T. Burton

Transverse single
-
spin

asymmetry measurement from SIDIS at an EIC

M.

Huang


Weak

mixing angle measurement at EIC

Y.

Li

PHENIX and STAR Detector

Upgrades (for use as Stage 1
eRHIC

detector)

E. O’Brien, J. Dunlop

… And of course, low
-
x physics at
LHeC

is a physics connection

EIC: the Machines, IR and Detector

Both BNL and
JLab

machine designs have progressed significantly.

In spite of very different starting points for collider concepts:


Both designs are now converging to similar luminosities:


Few x
10
34

cm
-
2

sec
-
1

for high energy


10
33
-
34

cm
-
2

sec
-
1

for low energy


Both
plan
a staged
realization


Both designs have settled on
more than one IR
point


Both machine designs
integrate detector
design
in to the
machine
lattice


Both detectors concepts include a
central solenoid and forward
dipole, extensive low mass tracking
for low x and good particle ID


4/10/11

Abhay Deshpande on EIC Collaboration's Perspective

40

Measurement of Glue at HERA


Scaling violations of F
2
(x,Q
2
)



NLO
pQCD

analyses: fits with
linear

DGLAP* equations

4/12/2011

Abhay Deshpande Overview of the US EIC Project

41

Gluon

dominates

*
Dokshitzer
,
Gribov
,
Lipatov
,
Altarelli
,
Parisi

EIC Detector will aim to catch:


Wide range in x
-
Q
2

extremely important to understand longitudinal &
transverse spin/momentum distributions and dynamics


Not available at any other existing or future facility with polarized hadron
beams being considered…


Lessons learnt from HERA (about measurements at low
-
x)

4/12/2011

Abhay Deshpande Overview of the US EIC Project

42

Electroweak & beyond


High energy collisions of polarized electrons and protons and
nuclei afford a unique opportunity to study electro
-
weak deep
inelastic scattering


Electroweak structure functions (including spin)


Significant contributions from W and Z bosons which have
different couplings with
quarks and anti
-
quarks


Parity violating DIS
: a probe of beyond
TeV

scale physics


Measurements at higher Q
2

than the PV DIS 12
GeV

at
Jlab


Precision measurement of Sin
2
Q
W


New window for physics beyond SM?


Lepton flavor violation search


3/24/11

A. L. Deshpande, Precision study of gluons in QCD

43

arXiv
: 006.5063v1 [
hep
-
ph
]

M.
Gonderinger

et al.

BNL LDRD: Deshpande, Marciano, Kumar &
Vogelsang

Some examples of “other” studies initiated….

4/10/11

Abhay Deshpande on EIC Collaboration's Perspective

44

Some examples of “other” studies initiated….

4/10/11

Abhay Deshpande on EIC Collaboration's Perspective

45

In part supported by BNL LDRD

Write
-
Ups in the INT Workshop Proceedings

Charged & Neutral Currents…

3/24/11

A. L. Deshpande, Precision study of gluons in QCD

46

20
×

250
GeV
, Q
2
> 1
GeV
2,

0.1
< y <
0.9,
10
fb
-
1
,
DSSV

PDFs

(Could begin the program with 5x250
GeV

)

Two studies: (1) Ringer &
V
ogelsang

(these figures),




(2)
Taneja
,
Riordin
,
Deshpande, Kumar &
Paschke

CC

N
C

Sin
2
Q
W
with the EIC


Deviation from the “curve” may be hints of BSM scenarios
including:
Lepto
-
Quarks, RPV SUSY extensions, E
6
/Z’ based
extensions of the SM

3/24/11

A. L. Deshpande, Precision study of gluons in QCD

47

Y. Li, W. Marciano

Opportunity for EIC


Limits on
LFV(1,3)
experimental searches are significantly worse
than those for LFV(1,2)


Especially if there are BSM models which specifically allow and
enhance LFV(1,3) over LFV(1,2)


Minimal Super
-
symmetric Seesaw model


J. Ellis et al. Phys. Rev. D66 115013 (2002)


SU(5) GUT with
leptoquarks


I.
Dorsner

et al.,
Nucl
. Phys. B723 53 (2005)


P.
Fileviez

Perez et al.,
Nucl
. Phys. B819 139 (2009)


M.
Gonderinger

&
M.Ramsey

Musolf
, JHEP 1011 (045) (2010);
arXive
: 1006.5063 [
hep
-
ph
]


Clearly there is an opportunity for EIC: if a search can be effectively
launched with it’s planned (high luminosity) and large large
acceptance detector suitable for the GPD/Exclusive physics program

3/24/11

48

A. L. Deshpande, Precision study of gluons in QCD

How does this compare with HERA?

1e-005
0.0001
0.001
0.01
0.1
1
10
100
11
12
13
21
22
23
31
32
33
R
a
t
i
o
:


i


j

/

M
L
Q
2

(
T
e
V
-
2
)
(q
i
q
j
)
Lepto-Quark: e q
i
-->

q
j
EIC- Smallest ratio can explore
HERA - Upper exclusion limits
Private communications: M.
Gonderinger

3/24/11

A. L. Deshpande, Precision study of gluons in QCD

49

SM vs. LPQ Comparisons

Df
miss



t
jet

=
Acoplanarity


Very different for SM vs. LPQ

3/24/11

A. L. Deshpande, Precision study of gluons in QCD

50

C.
Faroughy
, S.
Taneja
, M.
Gonderinger
, A. Deshpande & K. Kumar

Pythia

for Standard Model event topologies


LQGENEP Event generator for
Lepto
-
Quark events. By

L.
Bellagamba

Comp. Phys. Comm. 141, 83 (2001)

SM vs. LPQ
P
t
miss

10 x 250

2
0 x 325

3/24/11

A. L. Deshpande, Precision study of gluons in QCD

51

Acoplanarity
:
Df
miss
-
t
jet

10 x 250

2
0 x 325

3/24/11

A. L. Deshpande, Precision study of gluons in QCD

52

To do:




Inclusion of detector efficiencies


A detailed study of efficiency of cuts/selection criteria and its
efficiency.


Only then can we calculate the effective sensitivity per event not
seen


A GEANT based simulation of the detector is needed… and
being planned.

4/12/2011

Abhay Deshpande Overview of the US EIC Project

53