prospects for a large hadron-electron collider (lhec) at the lhc · 2008-07-08 · epac08 genoa...
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![Page 1: Prospects for a Large Hadron-electron Collider (LHeC) at the LHC · 2008-07-08 · EPAC08 Genoa June 23 to June 27 2008 1. Leptons and Quarks at the Terascale 2. The LHeC 3. Summary](https://reader036.vdocuments.site/reader036/viewer/2022081612/5f76a4b99063a901823075f3/html5/thumbnails/1.jpg)
EPAC08Genoa June 23 toJune 27 2008
1. Leptons and Quarks at the Terascale2. The LHeC3. Summary
Prospects for aLarge Hadron-electron Collider
(LHeC) at the LHC
Prospects for aLarge Hadron-electron Collider
(LHeC) at the LHC
John DaintonCockcroft Institute and Univ Liverpool, UK
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EPAC08Genoa June 23 toJune 27 2008
F Bordry, H-H Braun, O S Brüning, H Burkhardt, A de Roeck, R Garoby, T Linnecar, K-H Mess,
J Osborne, L Rinolfi, D Schulte, R Tomas, J Tuckmantel, F Zimmermann (CERN, Geneva),
A Eide (EPFL, Lausanne), F J Willeke (BNL, NY), S Chattopadhyay, J Dainton (Cockcroft Institute
and Univ. Liverpool), M Klein (Univ. Liverpool), B Holzer (DESY, Hamburg), A Vivoli (LAL, Orsay),
S Sultansoy (TOBB ETU, Ankara), A K Ciftci(Univ. Ankara), H Aksakal (Univ. Nigde)
http://www.lhec.org.ac.ukhttp://www.lhec.org.ac.uk
LHeC @ EPAC08LHeC @ EPAC08
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EPAC08Genoa June 23 toJune 27 2008
1.Leptons and Quarks at the Terascale
1.Leptons and Quarks at the Terascale
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EPAC08Genoa June 23 toJune 27 2008
Q
Why Leptons ↔ Quarks ?Why Leptons ↔ Quarks ?
•how are leptons and quarks related ?
● put them together at the highest energyin the finest detail ∆x∆Q ~ ħ
ICHEP76 Tblisi
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EPAC08Genoa June 23 toJune 27 2008 ep @ 100 GeV: 25 years onep @ 100 GeV: 25 years on● Genova 1983
- HERA collider begins construction- meeting to discuss experiments- 2 collaborations formed: H1 and ZEUS
● DESY Hamburg 1992- HERA ep collider begins data-taking
triumph of accelerator physicsworld’s first energy-frontier collider ofdifferent particle species
● Dallas ICHEP conference 1992- first results → unique eq ≤ 300 GeV (~ 1fb-1)
● DESY Hamburg 2007- last collisions and last data taken
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EPAC08Genoa June 23 toJune 27 2008
• accelerate beams to "head-on" collision27.6 GeV electrons + 920 GeV protons
electrons
protons
H1
Hermes
A “100 GeV” scale precision Collider HERA @ DESY
A “100 GeV” scale precision Collider HERA @ DESY
HERADESY
HamburgZEUS
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EPAC08Genoa June 23 toJune 27 2008
• challenge: different particle species ep in collision27.6 GeV electrons + 920 GeV protons
electrons
protons
H1
Hermes
A “100 GeV” scale precision Collider HERA @ DESY
A “100 GeV” scale precision Collider HERA @ DESY
HERADESY
HamburgZEUS
uud +seauud +sea
leptonlepton
1992-2007RIP
HERA+
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EPAC08Genoa June 23 toJune 27 2008
x
e
P
● x → fractional momm of struck piece of hadron→ “inelasticity” of struck parton→ how “far removed from parent hadron
properties” is parton
PhenomenologyPhenomenology
Q2
Q2 = (e - e’)2
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EPAC08Genoa June 23 toJune 27 2008
● Q2 → -(4-momentum xfer)2→ Q resolves spatial detail ΔxΔQ ~ 0.2 GeV·fm
PhenomenologyPhenomenology
e±e±
Q2
x
Qγ Z W
e±RL
?
e± RL am? Q2
seq
EW structure ?
q structure ?
EW+q = Lqstructure?
HERA @300 GeV
• no evidence for sub-structure of q eγ Z W @ HERA
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EPAC08Genoa June 23 toJune 27 2008
● x → fractional momm of struck piece of hadron→ “inelasticity” of struck quark
how “far removed from parent properties”
PhenomenologyPhenomenology
x
e±e±
x
x
increasing x low x physics
Q2
Q2Q2
Q
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EPAC08Genoa June 23 toJune 27 2008
• challenge: different particle species ep in collision27.6 GeV electrons + 920 GeV protons
electrons
protons
H1
Hermes
A “100 GeV” scale precision Collider HERA @ DESY
A “100 GeV” scale precision Collider HERA @ DESY
HERADESY
HamburgZEUS
uud +seauud +sea
leptonlepton
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EPAC08Genoa June 23 toJune 27 2008
• challenge: different particle species ep in collision27.6 GeV electrons + 920 GeV protons
electrons
protons
H1
Hermes
F2
A “100 GeV” scale precision Collider HERA @ DESY
A “100 GeV” scale precision Collider HERA @ DESY
ZEUS
uud +seauud +sea
leptonlepton
uud
sea
1992-2007RIP
HERA+
EPAC081st postHERA
HERA● low x- steep rise of q density
- for ever ?
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EPAC08Genoa June 23 toJune 27 2008 HERA: Lq physics @ 100 GeV?HERA: Lq physics @ 100 GeV?
•new eq physics - leptoquarks
expe
rim
ent
#1
1992
-199
6 37
pb-
1
LQ
q …
e
q
e
γ Z
e±
q
e
2
+
LQ+q
e
•SM theory ↔ experiment !
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EPAC08Genoa June 23 toJune 27 2008
expe
rim
ent
#2
1999
-200
081
pb-
1
•new eq physics - leptoquarks
•SM theory ↔ experiment !
LQ
q …
e
q
e
γ Z
e±
q
e
2
+
LQ+q
e
HERA: Lq physics @ 100 GeV?HERA: Lq physics @ 100 GeV?
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EPAC08Genoa June 23 toJune 27 2008
•new eq physics – 1992-2000 120 pb-1
Lqe
q …
e
qLq
ν
q …
e
q≤ 200 GeV
TeV ?
HERA: Lq physics @ 100 GeV?HERA: Lq physics @ 100 GeV?
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EPAC08Genoa June 23 toJune 27 2008
q …γ Ze±
q
•point-like Q2 ≤ 4х104 GeV2 → Rq < 10-18 m = 1 am
HERA: Quarks @ 100 GeV ?HERA: Quarks @ 100 GeV ?e μτ νe
qdata
SM=
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EPAC08Genoa June 23 toJune 27 2008
discovery + precision @ Terascale
precision structureand dynamics
@ LHC TeV scale
nuclear structure
& dynamics@ 100s GeV
very dense matter
● 70 ⊗ 7000 GeVe ⊗ p or ion A
- cm energy1400 GeV
● e-ring ⊗ LHC
● e-linac ⊗ LHC0.2 fm
0.2 am
3×10-7
space-like >TeV
seq >TeVLHeC
A “TeV” scale precision Collider LHeC @ DESY
A “TeV” scale precision Collider LHeC @ DESY
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EPAC08Genoa June 23 toJune 27 2008
Chadwick
Cambridge
nucleu
s
nucleo
nqu
ark
NC+
CC+g
luon
●LHeCg+
EW
?
●unique chiral probe @ 0.0001 fm ?
●
prot
ons+
neut
rons
Manchester
SLAC
●70 e± ⊗ p 7000 GeVcm energy 1400 GeV
SM + new Lq physics@ ~ 0.0001 fm ?SM + new Lq physics@ ~ 0.0001 fm ?
Lepton+quark @ TeVLepton+quark @ TeV
γ Z We±RL
?
e± RL am? Q2
seq
ΔQ·Δx ~ 200 GeV am
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EPAC08Genoa June 23 toJune 27 2008
Lepton+quark @ TeVLepton+quark @ TeV
LHC LHeC
SM (hadronic) + signalLq & LqLq productionσ ~ few × 0.1 fb (Λ = 0.1)
SM (electroweak) + signalLq formationσ ~ 100 fb (Λ = 0.1)
●leptoquark systems – new physics + SM
Re + resonance
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EPAC08Genoa June 23 toJune 27 2008 Lepton+quark @ TeVLepton+quark @ TeV
●leptoquark systems – new physics +SM
1 TeVLHeC×10-3
↓LHC
LHeC
LHC
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EPAC08Genoa June 23 toJune 27 2008
● LHeC: Q2 ≥ 1 GeV2 x ≥ 5×10-7
-parton recombination
Low-x @ TeVLow-x @ TeV
xQ2 y
e�e�
-”saturation”-dense hadronic matter
pion
????
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EPAC08Genoa June 23 toJune 27 2008
● LHeC: Q2 ≥ 1 GeV2 x ≥ 5×10-7
-parton recombination
Low-x @ TeVLow-x @ TeV
xQ2 y
e�e�
-”saturation”-dense hadronic matter
pion
????
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EPAC08Genoa June 23 toJune 27 2008 The Energy FrontierThe Energy Frontier
quarks neutral currents
singlet eRasymptoticfreedom
Drell YancharmW,Zjets
charm3 colours
gluon
lp e+e-
pp
SU(2)L x U(1)QCD
• 1968-1986
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EPAC08Genoa June 23 toJune 27 2008
spacelike EWstrong interactionhigh density QCD
c,b in hadrons(HERA)νmass
b quarkt quark
MW(TeVatron)
MZh.o. EW (
(LEP/SLC)
(B
lp
pp
StandardModel
, sin2θ, 3 νt,H ?)
CKM-factory)
e+e-
• 1986-2010Fermi scale
The Energy FrontierThe Energy Frontier
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EPAC08Genoa June 23 toJune 27 2008
TeVdiscovery& precision ?particles ?
symmetries ?dense QCD
(LHeC)
TeV discovery ?Higgs?
new particles?new symmetries?
(LHC)
ttdiscovery &precision ?
spectroscopyHiggs ?
(ILC/CLIC)
lpe+e-
pp
BeyondStandardModel
new physics
• 2008-2033?Terascale
-
The Energy FrontierThe Energy Frontier
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EPAC08Genoa June 23 toJune 27 2008 The Matter FrontierThe Matter Frontier
QCD dof @extremes
strong QCD ↔ 1C(LHeC)
QGP ?QCD phase equilibria?
nuclear dynamics?nuclear formation
(LHC)
pQCD(ILC/CLIC)
lA e+e-
AA
matter creationnew physics
• 2008-2033?chromodynamiccreation ?
ion = A
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EPAC08Genoa June 23 toJune 27 2008
2. The LHeC2. The LHeC
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EPAC08Genoa June 23 toJune 27 2008 Proton beamProton beam
●”standard” LHC protons
protonsantiprotons
protonsprotons
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EPAC08Genoa June 23 toJune 27 2008 Proton beamProton beam
●”standard” LHC protons
protonsantiprotons
protons
NpεpN
electrons?
… with electrons?
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EPAC08Genoa June 23 toJune 27 2008 LHeC ring-ringLHeC ring-ring
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EPAC08Genoa June 23 toJune 27 2008
L =Npγ4πeεpn
⋅Ie
β pxβ py
= 8.31032 ⋅Ie
50mAm
β pxβ pn
cm−2s−1
εpn = 3.8μm
Np =1.7 ⋅1011
σ p(x,y ) = σ e(x,y )
β px =1.8mβ py = 0.5m
Ie = 0.35mA ⋅P
MW⋅100GeV
Ee
⎛
⎝ ⎜
⎞
⎠ ⎟ 4
LHeC ring-ringLHeC ring-ring
s = (1.4 TeV)2
●e-ring- HERA
1.4х1031 cm-2s-1
- Ee ≤ 70 GeV ($s)- power P < 60 MW- ERL → ? cm-2s-1
lumi + energy horizon
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EPAC08Genoa June 23 toJune 27 2008
LHeC ring-ringLHeC ring-ring
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EPAC08Genoa June 23 toJune 27 2008
LHeC ring-ringLHeC ring-ring
● ring-ring (RR)- IR1 IR5 by-pass- ep 1.1х1033 cm-2s-1
ePb 1.1х1031 cm-2s-1
- bunch charge < LEPinjection < 22 GeV (ELFE?)
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EPAC08Genoa June 23 toJune 27 2008
LHeC ring-ringLHeC ring-ring
● IR5 by-pass+ IR1= pp and ep
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EPAC08Genoa June 23 toJune 27 2008
LHeC ring-ringLHeC ring-ring
● IR5 by-passsurvey gallery
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EPAC08Genoa June 23 toJune 27 2008
LHeC ring-ringLHeC ring-ring
● IR5 by-pass: survey gallery → CMS cavern
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EPAC08Genoa June 23 toJune 27 2008
Circulating LHC beams pass in between
support feet
Kicker magnet installed on beam
dump line above LHC
Equipment above installed LHC beamlines….
LHeC ring-ringLHeC ring-ring
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EPAC08Genoa June 23 toJune 27 2008
LHeC linac-ringLHeC linac-ring
● conceptual layout- new linac tunnel- ≤ 140 GeV e ⊗ 7 TeV p (≤ 2 TeV)- power for TeV → ERL+CW ?
use CERN rings (incl. LHC!) ?- CW or pulsed ?- integrated e+ source
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EPAC08Genoa June 23 toJune 27 2008 Linac-RingLinac-Ring
L =Npγ
4πeεpnβ* ⋅
PEe
=1⋅1032 ⋅P /MWEe /GeV
cm−2s−1
11107.1
8.3
⋅=
=
p
pn
N
mμε
Ie =100mA ⋅P
MW⋅GeVEe
← Ie = 100 mA
High cryo loadto CW cavities(no ERL)
m15.0* =β
●e-linac- HERA
1.4х1031 cm-2s-1
- Ee < 140 GeV ($s)- power P < 60 MW- 6 km+gaps @23 MV/m- ERL → ? cm-2s-1
lumi + energy horizon
s = (2 TeV)2
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EPAC08Genoa June 23 toJune 27 2008
LHeC ring-ringLHeC ring-ring
● power consumption→ ER ?
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EPAC08Genoa June 23 toJune 27 2008
Linac-Ring and Ring-RingLinac-Ring and Ring-Ring
L-R R-R
Energy / GeV 40-140 … 40-80
Luminosity / 1032 cm-2 s-1 0.5 10
Mean Luminosity, relative 2 1 [dump at Lpeak /e]
Lepton Polarisation 60-80% 30% [?]
Tunnel / km 5-9 2.5=0.5 * 5 bypasses ?
Biggest challenge CW cavities Civil EngineeringRing+Rf installation
Biggest limitation luminosity (ERL,CW) maximum energy
IR not considered yet allows ep+ppone design? (eRHIC) 2 configurations [lox, hiq]
● interruption to pp data-taking
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EPAC08Genoa June 23 toJune 27 2008
3. Summary3. Summary
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EPAC08Genoa June 23 toJune 27 2008 LHeCLHeC● LHeC is the terascale lepton-quark machine
- to date most pragmatic means of getting a lepton into a TeV interaction
- “upgrade of LHC” – simultaneous pp ep (AA eA)- exploits stupendous LHC hadron beams- challenges contemporary e-beam technology
synergies (ERL, linac, low emittance rings)- no showstoppers so far- CERN ECFA and NuPECC support
EIC/eRHIC collaboration- evaluation → CDR 2009/2010 → LHCC- TDR > 2010 → CDRquarks and leptons; why and how ? When ?
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EPAC08Genoa June 23 toJune 27 2008
ECFA/CERN LHeC Workshop.ECFA/CERN LHeC Workshop.
Accelerator Design [RR and LR]Closer evaluation of technical realisation: injection, magnets, rf, power efficiency, cavities, ERL…
What are the relative merits of LR and RR? Recommendation. Workpackages
Interaction Region and Forward/Backward Detectors
Design of IR (LR and RR), integration of fwd/bwd detectors into beam line.
Infrastructure Definition of infrastructure - for LR and RR.
Detector Design A conceptual layout, including alternatives, and its performance [ep and eA].
New Physics at Large Scales
Investigation of the discovery potential for new physics and its relation to the LHC and ILC/CLIC.
Precision QCD and Electroweak Interactions
Quark-gluon dynamics and precision electroweak measurements at the TERA scale.
Physics at High Parton Densities [small x and eA]
QCD and Unitarity, QGP and the relations to nuclear, pA/AA LHC and SHEν physics.
Divonne, 1-3.9.08
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EPAC08Genoa June 23 toJune 27 2008
thanksthanks
ECFA CERNWorkshop at
Divonne1-3.9.2008
http://www.lhec.org.uk
Opening
J.Engelen (CERN)B Fulton (NuPECC)
K.Meier (ECFA)G.Altarelli (Roma):DIS in the LHC time
1.9. 2pm
Indico=31463
Email:[email protected]
Patricia Mage-GranadosJill Karlson Forestier
Urs WiedemannMax Klein
Guido Altarelli (Rome)Stan Brodsky (SLAC)Allen Caldwell (MPI Munich)Swapan Chattopadhyay (Cockcrof Instt)John Dainton (Liverpool)John Ellis (CERN)Jos Engelen (CERN)Joel Feltesse (Saclay)Lev Lipatov (St.Petersburg)Roger Garoby (CERN)Rolf Heuer (DESY)Roland Horisberger (PSI)Young Kee Kim (Fermilab)Aharon Levy (Tel Aviv)Richard Milner (Bates)Steven Myers, (CERN)Alexander Skrinsky (Novosibirsk)Anthony Thomas (Jlab)Steven Vigdor (BNL)Ferdinand Willeke (BNL)Frank Wilczek (MIT)
Scientific Advisory Committee
Oliver Bruening (CERN)John Dainton (Cockcroft)Albert DeRoeck (CERN)Stefano Forte (Milano)Max Klein - chair (Liverpool)Paul Newman (Birmingham)Emmanuelle Perez (CERN)Wesley Smith (Wisconsin)Bernd Surrow (MIT)Katsuo Tokushuku (KEK)Urs Wiedemann (CERN)
Steering Committee
Registration is open
http://indico.cern.ch/event/LHeC_workshop
ECFA/CERN LHeC Workshop.ECFA/CERN LHeC Workshop.