max klein lhec pdf dis07 18.4.07 parton distributions from the lhec max klein (u.liverpool)
Post on 20-Jan-2016
229 views
TRANSCRIPT
![Page 1: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/1.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Parton Distributions from the LHeCMax Klein (U.Liverpool)
![Page 2: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/2.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Why is an ep collider at TeV scales of interest
-New Physics in the eq Sector leptoquarks, contact i.a.’s, RP violating SUSY,..-Quark-Gluon Dynamics and the Origin of Mass confinement and diffraction, the gluon-The Structure of Quantum Chromodynamics high density (CGC, instantons, odderons..), resumm’s-The Structure of the Proton substructure, parton correlations, transverse, uPDF’s-Precision for the LHC heavy flavour (b), strong coupling, partons-The Origin of the Quark Gluon Plasma partons in nuclei, deconfinement phase, CGC
If you bombard protons off each other you better control their structure.If you scatter electrons off positrons you avoid but also miss p’s structure. ep is the missing link between pp and ee, it has been for decades
thistalk
P.Newman
E.Perez
![Page 3: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/3.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Kinematic coverage of lepton proton scattering experiments
s4EeE p
LHeC : 707000 2106GeV 2
HERA : 27.6920 105GeV 2
s2M pE l
BCDMS : 280 500GeV 2
SLAC : 20 40GeV 2
Q2 sxy
x Q2
sy
Bjorken x 1inelasticity y 1
Q2 s
![Page 4: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/4.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Why precision?
Can one measure the strong coupling constant to per mil accuracy?
Full simulation of NC, CC including systematics and NLO fit
![Page 5: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/5.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Detector requirements
High luminosity to reach high Q2 and large x 1033 - 1034 1-5 1031
Largest possible acceptance 1-179o 7-177o
High resolution tracking 0.1 mrad 0.2-1 mrad
Precision electromagnetic calorimetry 0.1% 0.2-0.5%
Precision hadronic calorimetry 0.5% 1%
High precision luminosity measurement 0.5% 1%
The new collider
has to be 100 times more luminous than HERA
The new detector
has to be at least2 times better than the good old H1
LHeC HERA
![Page 6: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/6.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Low x Kinematics
105 eventsper pb-1 for Q2>100Lumi ‘easy’
Small anglespectrometer,favourable over THERAkinematicscf THERA bookfor detectorconcept[also W.Bartel Aachen 1990]
Dramatic extension of low x kinematic range
![Page 7: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/7.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Hi q2 kinematics
Maximum luminosity in current design achieved with focusing magnetsclose to IP (9o cut) two detectors or detector versions required [cf THERA] Lowx with 1032 , highQ with 1033 [higher in upgraded LHC]
![Page 8: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/8.jpg)
Max Klein LHeC pdf DIS07 18.4.07
LHeC Design
![Page 9: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/9.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Rates
Simulations done for 10fb-1 and statistical error limited to 0.1% low Q2, acceptance 1-10 degrees
![Page 10: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/10.jpg)
Max Klein LHeC pdf DIS07 18.4.07
The LHeC is an electroweak machine
Polarisation: not impossible, S/T 1/2 hour, consider from the start (DB)
![Page 11: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/11.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Lepton Polarisation
D.Barber
![Page 12: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/12.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Charged currents (e+)
![Page 13: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/13.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Charged currents (e-)
![Page 14: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/14.jpg)
Max Klein LHeC pdf DIS07 18.4.07
d/u at large x
![Page 15: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/15.jpg)
Max Klein LHeC pdf DIS07 18.4.07
d/u at large x
![Page 16: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/16.jpg)
Max Klein LHeC pdf DIS07 18.4.07
xF3Z
Valence quarks at low x
or/and unexpected sea
asymmetries
from yZ interference
HERA I
![Page 17: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/17.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Gluon Distribution
![Page 18: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/18.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Beauty quark distribution
1 fb 1
b 0.5bgdc 0.1syst 0.1
h 1o
h 10o
Impact parameter taggingAt LHeC may also tagdecays with dedicated vertex detectorbeam spot 35*15 m2
x=0.07
x=0.03
x=0.007
x=0.003
x=0.0007
x=0.0003
x=0.00007x=0.00003
HERA
![Page 19: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/19.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Higgs
Precision in q,g may become crucial
![Page 20: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/20.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Charm quark distribution
1 fb 1
c 0.1bgdq 0.01
syst 0.1
h 1o
h 10ox=0.07
x=0.03
x=0.007
x=0.07
x=0.007
x=0.003
x=0.0007
x=0.0003
x=0.00007x=0.00003
HERA
![Page 21: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/21.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Strange quark distribution
W s c
1 fb 1
c 0.1q 0.01
syst 0.1
h 1o
h 10o
![Page 22: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/22.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Anti-Strange quark distribution
W sbar cbar
1 fb 1
c 0.1q 0.01
syst 0.1
h 1o
h 10o
![Page 23: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/23.jpg)
Max Klein LHeC pdf DIS07 18.4.07
The LHC is also the highestenergy heavy ion collider
![Page 24: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/24.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Available data on F2 in nuclei
Limited information on quarks and nearly none on gluons
K.Eskola (ed), hep-ph/0308248; S. Kumano DIS06; D.Florian and R. Sassot, hep-ph/0311227; FGS, Phys Rev.D71(05)054001; LMcLerran,Glasma..
The LHeC extends the eA kinematic range by 4 orders of magnitude
![Page 25: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/25.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Determination of nPDF’s
In eA at the collider, test Gribovsrelation between shadowing anddiffraction, control nuclear effectsat low Bjorken x to high accuracy
S. Kumano DIS06
![Page 26: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/26.jpg)
Max Klein LHeC pdf DIS07 18.4.07
d/u at low x from deuterons
Note all QCD fitsassume u=d at low x
No constraintfrom HERA
[W asymmetry]
![Page 27: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/27.jpg)
Max Klein LHeC pdf DIS07 18.4.07
High density amplification?
p
A
pp
AA
Ag
gA
rg
rg 3/12
2
/
/
High density
Unitarity
Striking effects predicted:bj -> black disc limit F2Q2ln(1/x)
~50% diffractioncolour opacity, change of
J/(A) … Understanding the possible observation of QGP in AA with eA
![Page 28: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/28.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Summary
No surprise: an ep collider at TeV energies has a fascinating potential to explore proton’s structure much deeper than hitherto. It will allow pQCD to “live Long” Y.D.
Precision (as for the gluon distribution or the strong coupling constant to ~0.0003)and diversity (as in the complete flavour decomposition [u,d,s,c,b]) make the LHeC the best feasible successor of HERA, thanks to its expected very high luminosity and the very high energy, i.e very high Q2 and very low x coverage
This could have been demonstrated completely differently with jets, VM’s, ordeeply virtual Compton scattering DVCS (1/Q3), for example.
Next steps are:-a much deeper evaluation of the physics potential (cf also E.Perez, P.Newman)
-a thorough evaluation of the LHeC physics in its relation to the LHC-a draft design of a detector or detectors of high precision and acceptance-a more detailed design of the IR and study of the injectionThis will take 2-3 years. By then the LHC will have shown its potential.
DIS is facing a phase transition and we all are invited to lead this such thatlepton-nucleon scattering stays as a recognised part of modern particle physics.
![Page 29: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/29.jpg)
Max Klein LHeC pdf DIS07 18.4.07
paper
Thanks to
JBD,PN,EP,FW+Ewelina LobodzinskaThomas KlugeAndy MehtaDes Barberfor help and thenew members ofthe SAC forencouragementtowards a designstudy of the LHeCby the end of 2009cf talk of J.Dainton.
![Page 30: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/30.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Backup slides
![Page 31: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/31.jpg)
Max Klein LHeC pdf DIS07 18.4.07
LHeC, HERA and EIC
![Page 32: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/32.jpg)
Max Klein LHeC pdf DIS07 18.4.07
A data
S. Kumano DIS06
LHeC providesgenuine determinationof nuclear quark andgluon distributions based on wide rangeof data in x,Q2,A
![Page 33: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/33.jpg)
Max Klein LHeC pdf DIS07 18.4.07
Forward Jet production to discriminate low x evolution
cf Thera Book Jung, Loennblad
![Page 34: Max Klein LHeC pdf DIS07 18.4.07 Parton Distributions from the LHeC Max Klein (U.Liverpool)](https://reader035.vdocuments.mx/reader035/viewer/2022062305/56649d385503460f94a113d9/html5/thumbnails/34.jpg)
Max Klein LHeC pdf DIS07 18.4.07
title