physics opportunities and experimental techniques for the next large scale facility in accelerator...
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Physics Opportunities and Experimental TechniquesPhysics Opportunities and Experimental Techniquesfor the Next Large Scale Facility in Accelerator Particle Physicsfor the Next Large Scale Facility in Accelerator Particle Physics
The International Linear ColliderThe International Linear Collider
Marco BattagliaUC Berkeley and LBNL
TASI, Boulder, June 2006
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International e+e- Linear Collider
ILC highest priority for future major facility in HEPneeded to extend and complement LHC discoveries with accuracy which is crucial to understand nature of New Physics, test fundamental properties at high energy scale and establish their relation to Cosmology;
Technology decision promotes ILC towards next stage inaccelerator design definition, R&D and cost optimization:
Matching program of Physics studies and Detector R&D needed develop new accurate and cost effective detectortechniques from proof of concepts to a state of engineering readiness to be adopted in the ILC experiments.
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Synergy of Hadron and Lepton Colliders
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Synergy of Hadron and Lepton Colliders
Mass scale sensitivity vs. centre of mass energy
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ILC Energy
Physics to define next thresholds beyond 100 GeV:
Top Quark pair production threshold:
Strong prejudice (supported bydata) on Higgs and New Physicsthresholds between EW scale and ~ 1 TeV:
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ILC Energy in Perspective
Cosmotron (3.3 GeV), BNLBevatron (6.2 GeV), LBNL
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Centre-of-Mass Energy vs. Year
as of 1992 as of 2000
?
we have fallen off the scaling predicted by Stanley Livingston’s curve.
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Why Linear ?
?
Particles undergoing centripetal acceleration a=v2/R radiate at rate:
if R constant, energy loss is above rate x time spent in bending=2R/v
R
R
for e- (E in GeV, R in km)
for p(E in TeV, R in km)
Since energy transferred to beam per turn is constant: G x 2R x Fat each R there is a maximum energy Emax beyond which energyloss exceeds energy transferred, real limit set by dumped power;
Example: LEP ring (R=4.3 km) Ee=250 GeV W = 80 GeV/turn
Synchrotron Radiation
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ILC Energy
Technology to define reachable energy:
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Cold SC cavity technology chosen;Global Design Effort to produce costed Technical Proposal by end 2006CLIC technology being demonstratedby R&D CTF3 facility at CERN.
Major step towards construction of new HEP facility in August 2004:
Accelerator R&D reached maturity to assess technical feasibility and informed choice of most advantageous technology. ILC potential in future of scientific research praised by OECD. DOE Office of Science ranked ILC as top mid-term project.
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ILC Baseline Design
9-cell 1.3GHz
TESLA Niobium Cavity
35 MV/m baseline gradient
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2
0
$ lincryo
a Gb
G Q
ILC Baseline Design
Cavity Gradient Cavity Cost vs. Gradient
32 km44 km
51 km
Optimisation for 500 GeV ILCCost vs. Gradient
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SC Cavity Gradient
TESLA Cavities 2005
LEP-2 Cavities 1999-2000
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ILC Luminosity
Since cross section for s-channel processes scales as 1/s, luminosity must scale to preserve data statistics;
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ILC Luminosity
Luminosity functional dependence on collider parameters:
Compared to circular colliders (LEP) frep and must be compensated by increasing the nb. of bunches (Nb) and reducing the transverse beam sizes (x, y);
Small beam size induces beam-beam interactions: self focusing and increase of beamstrahlung resulting in energy spread and degradedluminosity spectrum:
N = L x
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ILC Luminosity Optimization
High Efficiency
High Beam Power
Parameter 0.5
TeV
1.0
TeV
Nb 2820 2820
y (nm) 5.7 3.5
BS 0.022 0.050
HD 1.7 1.5
PBS (W) 0.2 0.9
Large Beamstrahlung
Small vertical emittance and short bunch length
Parameter 0.5
TeV
1.0
TeV
G (MV/m) 30 30
L (1034 cm-2 s-1) 2.0 2.8
2.0 2.0
tb (ns) 307 307
ny 1.26 1.43
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2005 2006 2007 2008 2009 2010
Global Design Effort Project
Baseline configuration
Reference Design
ILC R&D Program
Technical Design
Bids to Host; Site Selection;
International Mgmt
LHCPhysics
from B. Barish
ILC GDE : Plan and Schedule
CLICfeasibility
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Three Main Physics Themes
• Solving the Mysteries of Matter at the TeraScale (= Higgs/SUSY/BSM);
• Determining what Dark Matter particles can be produced in the laboratories and
discovering their identities (=SUSY/ED);
• Connecting the Laws of the Large to the Laws of the Small (=EW/SUSY/ED)
ILC Physics Objectives
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The Higgs Boson Profile at the ILC
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Higgs Boson Production at ILC
MH (GeV)
(e+
e-
H)
(fb)
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Model Independent Higgs Reconstruction
Associate H0Z0 production, with Z0 ll, allows to extract Higgs signal from recoil mass distribution, independent on H decay;
Analysis flavour blind and sensitiveto non-standard decay modes, suchas Hinvisible
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Model Independent Higgs Reconstruction
H
Z
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The Recoil Mass Technique
e+e- HZ
Ecm = EZ + EH
0 = pZ + pH
MH2 = EH
2 – pH2 =
= (Ecm-EZ)2 – pZ2 =
= Ecm2 + EZ
2 – EcmEZ – pZ = = Ecm
2 – 2EcmEZ + MZ2
Resolution on MH depends on knowledge of colliding beam energyand on lepton momentum resolution.
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Yukawa couplings vs. fermion mass
Determining the Higgs Couplings
After discovery of a new boson at LHC, essential to verify that this new particle does indeed its job of providing gauge bosons andfermions with their masses;
ILC can perform fundamental test of scaling of Yukawa couplings with masses for Gauge bosons, quarks and leptons with accuracy matching theoretical predictions; Recent improvements in mb and mc determinations at B factoriesmake ILC measurements even more compelling.
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Higgs Decay Branching Fractions vs. Higgs Mass
Determining the Higgs Couplings
Extract Higgs couplingsfrom decay branching fractions into fermions and gauge bosons and from production crosssections (controlled bygHZZ, and gHWW);
Strong dependence on(unknown) Higgs Boson mass.
Exc
lud
ed b
y L
EP
-2
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Generation of Mass: the Gauge Sector
Ecm
TeV
MH
120
MH
140
MH
150
gHZZ/gHZZ 0.5 0.024 0.027 0.029
gHWW/gHWW 0.35 0.026 0.053 0.103
Determine HZZ coupling from Higgstrahlung cross section andHWW coupling from double-WW fusion and HWW branching ratio;
H also possible at colliderconsidered as ILC option;
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The Jet Flavour Tagging Technique
Tag H hadronic decay products to separate b, c and g yields;
Jet flavour identification relies on distinctive topology and kinematics of heavy flavour decays;
H bb
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The Jet Flavour Tagging Technique
Short lived particle with proper time has adecay distance l = c
B from H decay at 0.5 TeVmB = 5.2 GeV, c = 500 mEB = 0.7 x Ejet = 0.7 x 500/4 = 100 GeV<l> ~ 3.5 mm
b c g
<l> (mm) 3.5 1.3 ~ 0.
<Nsec> 5.1 2.7 ~ 0.
D from H decay at 0.5 TeVmD = 1.9 GeV, c ~ (123+311)/2 m<l> ~ 1.3 mm
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Generation of Mass: the Quark Sector
Extract individual branching fractions from 3-parameter simultaneous fit:
gHbb/gHbb 0.006
gHcc/gHcc 0.060
gHgg/gHgg 0.041c-tag
b-tag
ccgg
bb
Coupling Accuracy forMH=120 GeV
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Generation of Mass: the Lepton Sector
Ecm
TeV
MH
120 140 150
gH/gH0.5 0.027 0.050
gH/gH0.8 0.150
gH/gH3.0 0.035 0.060 0.11
Higgs decays intopairs identified by topology, multiplicity;
H as rare decay allows test of Yukawa coupling scaling with mass in leptonic sector;
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Higgs Quantum Numbers
JPC numbers can be determined in model-independent way:
Threshold cross section rise and angular dependence of the Z boson production from longitudinal polarization at high energies allows to determine and to distinguish SM H0 boson from a CP-odd A0 boson and the ZZ backgroundas well as from a CP-violating mixture:
Observation of Hor H setsand ;
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Determining the Higgs Potential
Fundamental test of Higgs potential shape through independent Determination of gHHH in double Higgs production
Opportunity unique to the ILC,LHC cannot access double HProduction and SLHC may haveonly marginal accuracy;
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Determining the Higgs Potential
Experimental challenge: not only cross sections are tiny (< 1 fb), but need to discard HH production notsensitive to HHH vertex.
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Double Higgstrahlung at 0.5 TeV Double WW Fusion at 1 TeV
HH Mass Decay Angle
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pt/pt2 =
4 x 10-5
pt/pt2 =
8 x 10-5
pt/pt2 =
6 x 10-5
pt/pt2 =
2 x 10-5
Reconstructing the Higgs profilesets challenging requirements on vertexing, tracking and calorimetry:
E/E
BR(HWW)MH ee HHZ
E/EE/E
ee HZ X
Higgs Physics and Detector Response
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The Higgs Profile and Physics beyond
In models with extended Higgs sector, such as SUSY, Higgs couplings get shifted w.r.t. SM predictions:
Precise BRs measurements determine the scale of extended sector:
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The Higgs Profile and Physics beyond
Higgs/Radion mixing
In models with new particles mixing with the Higgs boson,branching fractions are modified,generally through the introduction of an additional (invisible) decaywidth;
Models of extra dimensions stabilised by the Radion are characterised by potentiallylarge changes to Higgs decayBranching fractions: