Precision QCD and electroweak physics at LHeC · 2012-04-03 · Complete unfolding of all parton...
Transcript of Precision QCD and electroweak physics at LHeC · 2012-04-03 · Complete unfolding of all parton...
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Precision QCD and electroweak physics at
LHeC
Olaf Behnke (DESY)
DIS 2012, Bonn, Germany 29th march 2012
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Need for LHeC
27.5 GeV x 920 GeV ep HERA
with integrated L~0.5 fb-1 was a
high precision machine for QCD
modest precision machine for electroweak physics
Where could we go with a
60 GeV x 7 TeV e±p, also eA collider
with integrated L~1-100 fb-1 ?
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Lepton proton scattering experiments
LHeC = highest
energy and high lumi
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Physics and Range
High mass 1-2 TeV
rq few times 10-20 m
High precision
partons in plateau
of the LHC
Nuclear
Structure
& dynamics
High Density Matter
Large x
LHeC grand
picture
Talk Content: Accelerator 1. Inclusive DIS & PDFs 2. Jets & Heavy flavours 3. Electroweak physics
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LHeC Accelerator options
Ring-Ring Power Limit of 100 MW wall plug with “ultimate” LHC proton and 60 GeV e± beam
L = 2 1033 cm-2s-1
O(100) fb-1
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LHeC Accelerator options
LINAC Ring 60 GeV “Circus Maximus” with Energy recovery L = 1033 cm-2s-1
O(100) fb-1
140 GeV pulsed LINAC L = 0.4 1032 cm-2s-1 O(4) fb-1
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Max Klein - Scenarios and Measurements
1. Inclusive NC & CC DIS: simulated Default Scenarios http://hep.ph.liv.ac.uk/~mklein/simdis09/lhecsim.Dmp.CC, readfirst
Not simulated
Max Klein, LHeC
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8 Max Klein - Scenarios and Measurements
Kinematics – high Q2
Need
excellent
forward
hadron
calorimetry &
calibration 8
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The Detector ‘that should do it’: Ring-Linac scenario
Outer detectors (HAC tailcatcher/muon detectors not shown)
also not shown: forward proton taggers, backward lumi monitors 9
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Max Klein - Scenarios and Measurements
Trivial, but
important:
largest Elep
allows highest
Q2 scales
Pseudodata: Neutral Current Event Rates
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Neutral Current reduced s
Precise data from smallest to high x 11
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Photon and Z exchanges are 1:1
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2 charges and 2 polarisations
very desirable
for electroweak precision physics
and a
new spectroscopy
should that appear.
x=0.2 100 GeV
7000 GeV
F2 yZ ZZ
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Z effects depend
on lepton charge and
polarisation.
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General Remark: LHeC can uniquely reach/exploit electroweak sector: • Z and W exchanges assist g
exchange for complete quark
flavour decomposition of proton
structure (next slides)
• precision electroweak tests, e.g.
sin 2 qw(m) (end of talk)
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Charge Asymmetry xF3gZ
60x7000 GeV2 P=0
10fb-1
Get handle on valence quarks
from x~0.001 to x~0.8
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15 Max Klein - Scenarios and Measurements
Rates
LHeC: expect ~
two orders of
magnitude
more events
+ better
coverage for
x>0.5
Max Klein - Scenarios and Measurements
Pseudodata: Charged Current Event Rates
q
q’
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Charged Currents
Valence quarks
up to x=0.8
Unfold U,D and
anti U,D
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u
d
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Strange =? Anti-strange quark density
Some dimuon and K data, but never properly measured
Use e- p data for sbar
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Pin down
s & sbar
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How well do we know PDFs today? gg parton luminosities
Agree in region relevant for Higgs at LHC,
but diverge towards smaller/largest shat
G. Watt
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Impact of LHeC incl. NC & CC on PDFs: gluon
19 Unique improvement over huge x range
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Impact of LHeC incl. NC & CC
on PDFs: uv,dv
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Also helpful to pin down
u/d for x 1
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Impact of LHeC incl. NC & CC on PDFs: sea
21 Unique improvement over huge x range
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Sea quark uncertainties and usual constraint ubar=dbar for x0
release constraint
Voica Radescu
With LHeC can get rid
of such assumptions
with constraint
HERA only
Adding LHeC
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Plenary ECFA, Max Klein
Further PDF improvements at LHeC with ep + eD
crucial constraint on evolution (S-NS), improved s
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~0.1%
precision
1/ fine structure
weak
strong
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Strong Coupling Constant from inclusive DIS
Existing NNLO results
HERA + LHeC
~1% prec.
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2. Measurements @LHeC
with hadronic final states:
Jets and
Heavy flavours
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High pt Jets
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Different processes allow to
disentangle g(x) and s
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study running of s up to 500 GeV 28
Jet production
DIS
Photoproduction
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Will reduce significantly theory (higher order)
uncertainty for s extraction from jet data
O(s3)
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sensitive to g(x) 30
Charm and Beauty
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for PDF fits 31
Subtle topic: heavy quark mass dependent terms in pQCD
c,b = massless seaquarks
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Charm production contribution to F2 = F2cc
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LHeC: Huge
phasespace extension
and high precision
ultraprecise mc
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Charm production contribution to F2 = F2cc
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LHeC: Huge
phasespace extension
and high precision
𝑄2 ≫ mc2
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Charm production contribution to F2 = F2cc
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LHeC: Huge
phasespace extension
and high precision
Low x
𝑄2 ≫ mc2
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Charm production contribution to F2 = F2cc
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LHeC: Huge
phasespace extension
and high precision
Low x
𝑄2 ≫ mc2
High x
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x=0.1
x=0.3
Max Klein
Test intrinsic charm in proton
Have some sensitiviy (with excellent forward c-tagging) 36
CTEQ6.6 with intr. c
without
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O.B.
Beauty in DIS: determine b-density in proton x=0.000001
HERA
coverage
Q2>>mb2
O.Behnke
x=0.2
In MSSM Higgs production
is b dominated
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Use for LHC
predictions
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3. SM electroweak and new physics
at the high energy frontier
HERA
LHeC
Light quark couplings to Z
SM Higgs production
Leptoquarks + many other possibilities, e.g. excited leptons, anomalous single top production, etc. (not further discussed in this talk)
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Fermion couplings to Z boson
Claire Gwenlan.
LHeC could measure u and d couplings with ~1% precision
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37
Parity violating Neutral Current polarisation asymmetries
Determine sin2 qw
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Running sin2qw(m)
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Backup slides
39
100 GeV
+ Unambigious
HWW coupling
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The LHeC has potential to completely unfold the partonic content of the proton: u,d, c,s,
t,b for the first time and in an unprecedent kinematic range. This is based on inclusive
NC, CC cross sections complemented by heavy quark identification.
Puzzles as strange-antistrange asymmetry or u/d at large x will be solved.
Precision measurements are possible of xg (up to large x) and the beauty density which
are of particular relevance for the LHC. The (almost) whole p structure which the LHC
assumes to know will become accurately known.
Determine s with permille level precision
Wealth of QCD tests with final states: Jets (running s, test of higher orders, proton and
photon structure), heavy flavours (mass terms in PQCD) , not discussed here: prompt
photons, other identified particles
Low x and diffractive physics with ep and eA: See following talk by Anna Stasto
Electroweak and new physics
- Light quark couplings to Z at ~1% level
- SM Higgs production for H-> bb coupling
- New physics: Leptoquarks and quantum numbers, quark radius, leptons* and more!
Summary
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40
Physics summary - artistic view
Title plot from Conceptional Design Report
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Backup slides
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48 48
1⁰ and 179⁰ 2⁰ and 178⁰ 3⁰ and 177⁰ 4⁰ and 176⁰ 5⁰ and 175⁰
10⁰ and 170⁰
250 217 250 250 217
177 40 40
177
[cm]
289
112
40 20
The High Lumi (High Q2) Setup
HaC-Barrel
Modules
EmC-Barrel
Central Tracking HaC-insert-2
EmC-insert-2
L1 Low Q2 SetUp High Q2 SetUp - Fwd/Bwd Tracking & EmC-Extensions, HaC-Insert-1 removed -Calo-Inserts in position -Strong Focussing Magnet installed
Strong Focussing
Magnet
(to be optimised)
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The Detector ‘that should do it’: - Low Lumi (Low Q2) Setup
- Solenoid surrounding the HAC modules
-Outer detectors (HAC tailcatcher/muon detectors not shown)
to be discussed: very forward detector setup (proton taggers)
To be optimised
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Master formulae for NC DIS
Vary charge and polarisation and beam energy to
disentangle contributions
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Charged Currents
Complete unfolding of all parton distributions
to unprecedented accuracy 45
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Neutral current cross section errors at LHeC:
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FL at LHeC
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Charged current processes at LHeC
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x=0.00003
x=0.00007
x=0.0003
x=0.0007
x=0.003
x=0.007
x=0.0000
x=0.03
x=0.1
x=0.3
1 fb1
c 0.1
bgdq 0.01
syst 0.1
h 1o
h 10o
Max Klein
Charm in DIS: test intrinsic charm in p
Expected to show up
at xb >0.1
Requires c-tagging in very foward direction (q~1 deg.) 48
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Beauty production contribution to F2 = F2bb
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Parity violating polarisation
asymmetries
(for 60 GeV and 140 GeV lepton
beams)
SLAC 1978 50
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New physics example
Leptoquarks: determine
quantum Numbers at LHeC
Charge asymmetry much
cleaner in ep than in pp.
Similar for simultaneous
determination of coupling
and quark flavour. Polarisation
for spectroscopy
JINST 1 2006 P10001
Single LQ production at LHC
Single LQ
production
at LHeC
e-p vs e+p asymmetries at LHeC
will reveal the Fermion number F 39