cms observation of a new boson at the lhc and its implications for the origin of mass
DESCRIPTION
CMS Observation of a new boson at the LHC and its implications for the origin of mass. . Wim de Boer (for the CMS Collaboration). Outline. Evidence for a Higgs particle in CMS Is it Peter´s Higgs or just a Higgs? What it has to do with the “origin of mass” in the universe? - PowerPoint PPT PresentationTRANSCRIPT
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KIT – University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association
Institut für Experimentelle Kernphysik
www.kit.edu
CMS Observation of a new boson at the LHC and its implications for the origin of mass.
Wim de Boer (for the CMS Collaboration)
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2Wim de Boer Time and Matter, Venice, March 2013
Outline
Evidence for a Higgs particle in CMS Is it Peter´s Higgs or just a Higgs? What it has to do with the “origin of mass” in
the universe? What is the Higgs boson good for? What is so special about observed Higgs
particle?
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The LHC
Two rings with 1232superconducting dipolesand 858 quadrupoles,26,7 km circumference
max. 2808 proton bunches, 40 MHZ collision rate,~1011 Protons / bunch
~500 million pp collisions / s at 7 & 8 TeV centre of mass energy
Bending magnets
Cavities for acceleration
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Design Criteria for the CMS Experiment
Very good muon identification and momentum measurement.
H® ZZ, with Z®mm
Most precise photon detector. H®gg
Powerful inner tracking for electron identification.
H®ZZ, Z®ee
Hermetic calorimetry for missing ET signatures: H®WW, W® mn
First conceptual design of a “Compact Muon Solenoid” (CMS) was presented in Aachen (1990) based on a 4 Tesla solenoid.
4
From M. Della Negra, Wess-prize recipient (with P. Jenny), 2013, Karlsruhe
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Compact Muon Solenoid (CMS) Experiment
Silicon Detectors
Measure tracks left by charged particles
CalorimetersAbsorb particles and
measure their energy
Muon DetectorsIdentify and
measure muons that penetrate
3.8 T MagnetBend tracks of
charged particles
z
0 (center)
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CMS Collaboration
1400 Physicists600 Graduate students175 Institutes38 Countries
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Assembly in the surface hallWaiting for the cavern to be ready
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Descent of the central wheel (2000 tons)
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Heart of CMS: all silicon tracker (200 m2!)
66 million silicon pixels: 100 150 µm2 9.3 million silicon microstrips: 80µm - 180µm. ~200 m2 of active silicon area (cf ~ 2m2 in LEP detectors)~13 precise position measurements (15 µm ) per track.
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Pile-up: many collisions pro bunch crossing
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78 reconstructed vertices in high pile-up run
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Dimuon mass resolution
24 years of e+e- machines 24 hours of LHC
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LHC Luminosity
New records: – centre-of-mass energy 8 TeV – peak luminosity 0.77∙ 1034 / cm² /sec – best week ∫L=1.35 fb-1 ( 75% design luminosity @ half energy & half # of bunches)
summer conferences
2012
HCP 2012
(delivered)
TAM 2013
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Status of Higgs Hunt in July 2012
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pp processes in Standard Model
7 14 TeV
9 orders of magnitude: 1 in a billion
Higgs events are rare !Need 5x more lumi at 14 TeVto discover 500 GeV Higgs
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SM background
well understood
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Higgs Production at the LHC
„gluon fusion“
„vector boson fusion“
„vector boson radiation“
„tt associated produktion“
Rate @ 8 TeV 25-50% higher than7 TeV
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Higgs branching ratios
below ZZ “threshold” there is a lZl mode with an “off shell Z”, conventionally called ZZ*. The decay width, Z ~ 2.5 GeV and the Breit-Wigner resonant mass distribution,
2 2 2/ ~ ( / 2) /[( ) ( / 2) ]od dM M M means that the ZZ* decay rate is suppressed by a factor of 2~ [( / 2) /( )]Z ZM M with respect to ZZ decays
Note that q,l width ~ M while W,Z width ~ M3. Hence bb dominates below WW “threshold”. is down by ~ 9 due to coupling to mass, and 1/3 color factor.
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Higgs branching ratios bb dominates below WW
threshold. is down by ~ 9 due to
coupling to mass, and 1/3 color factor.
WW higher than ZZ because distinguisable particles:
In addition phase space.
We are lucky with Mh=126 GeV: bb down to 60 % and „golden“ channelsZZ->4l and gg already appreciable! (golden, since they show narrow invariant mass peak with width limited by experimental resolution)
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Searching for the Higgs in the four leptons final state
For a low mass Higgs the fourth lepton is soft.Selection cuts:Electrons pT > 7 GeVMuons pT > 5 GeV40 GeV < m12 < 120 GeV m34 > 12 GeV
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Higgs candidate ZZ event (8TeV) with 2 µ and 2 e
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H ® ZZ ® 4 leptons
Expected: BG:9.4, SIGNAL: 18.6 Total: 28Observed: 25 Signal strength: m0.9 0.3Significance 6.7 (7.2 exp) Mass: 125.8 ± 0.5 (stat) ± 0.2 (syst) GeV
6
7
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December 2012 data
Significance 4.5 Mass 126.2 ± 0.6 (stat) ± 0.2 (syst) GeV
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Search for the SM Higgs boson in the gg channel
m/m = 0.5 [E1/E1 E2/E2 cot(q/2)Dq]
H ® gg Simulation (100 fb-1)
E3%
E 0.39%129MeV
E
PbWO4 crystalsTest Beam October 2003
Target for the intercalibration < 0.5%
Mass resolution is the key for Higgs discovery in this channel
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Mass resolution of gg system: Find the right vertex
• Algorithm to find the right vertex based on SpT2 of tracks and pT
gg balance.
• Tested on Z®mm events by treating muons as gammas.• Overall efficiency to find the right vertex for Higgs (m = 120 GeV)
integrated over pT spectrum: ~ 80%
g1
g2m/m = 0.5 [E1/E1 E2/E2 cot(q/2)Dq]
Need vertex to better than 10 mm, bunch 50 mm
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Diphoton Candidate
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gg Mass Distribution
Background is estimated from the data by a polynomial fit.
An excess is observed consistent with a narrow resonance around
125 GeV mass at 4.1
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Outline
Evidence for a Higgs particle in CMS Is it Peter´s Higgs or just a Higgs? What it has to do with the “origin of mass” in
the universe? What is the Higgs boson good for? What is so special about observed Higgs
particle?
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Other Channels
• Search for the Higgs in other decay modes : WW, bb and • Combined significance at MH=125.8 GeV: 6.9 • Overall satisfactory level of compatibility with the SM cross section. • Combined /SM = 0.88 ± 0.21 (so signal consistent with Peter’s Higgs)
MH=125.8 GeV
Expected ()
Observed ()
ZZ 5.0 4.5gg 2.8 4.1
WW 4.3 3.0bb 2.2 1.8 2.5 1.5
Combination 7.8 6.9
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A first glimpse at SpinParity
in favour of 0+ ! p(0–) = 0.072 p(0+) = 0.72
So spin and parity consistent with Peter’s Higgs
Spin 0 2 S=1 particles angular correlations.
Positive parity 12 allowed decay planes aligned.
Negative parity 12 allowed decay planes orthogonal
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Couplings for various channels
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Fit of generalized couplings
So couplings consistent with Peter’s Higgs
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Outline
Evidence for a Higgs particle in CMS Is it Peter´s Higgs or just a Higgs? What it has to do with the “origin of mass” in
the universe? What is the Higgs boson good for? What is so special about observed Higgs
particle?
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Is Higgs Field the „Origin of Mass“?Answer: Yes and No. Energy or mass in Universe has little to do with Higgs field. Higgs field gives only elementary particles mass.
Mass in universe:
1) Atoms: most of mass from binding energy of quarks in nuclei, provided by energy in colour field, not Higgs field. (binding energy
potential energy of quarks kinetic energie of quarks, ca. 1 GeV, mass of u,d quarks below 1 MeV!)
2) Mass of dark matter: unknown, but in Supersymmetry by breaking of this symmetry, not by breaking of electroweak symmetry.
3) Dark energy: Higgs energy density seems too large. Why? Gigantic problem!
matter = 0.3
dark
ene
rgy =
0.7
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The gigantic dark energy problemAccelerated expansion of universe implies a constant energy density in space time, either a cosmological constant or some kind of vacuum energy. The Higgs field is thought of as permeating space time with a constant energy density, which can be easily estimated from the effective potential to be 55 orders of magnitude above the dark energy density of about 10-29 g/cm3
If zero-point fluctuations of field considered and integrated to Planck scale, problem even more severe: (1018)4 GeV4 = 120 orders of magnitude larger than the dark energy density
In Supersymmetry problem somewhat less, since above breaking scale fermions and bosons cancel in zero-point fluctuations,problem „only“ 60 orders of magnitude.
V(=0) = -mH2mW
2/2g2
= O(108 GeV4) = 1026 g/cm3
1 GeV4=(GeV/c2 )(GeV3/(ħc)3)= 10-24 g 1042 cm-3 = 1018 g/cm3
Average density in universe:
crit = 2.10-29 g/cm3
WHY IS THE UNIVERSESO EMPTY???
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Outline
Evidence for a Higgs particle in CMSIs it Peter´s Higgs or just a Higgs?What it has to do with the “origin of mass” in the universe?What is the Higgs boson good for? What is so special about observed Higgs particle? Does the observation point to physics beyond the Standard Model?
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What is the Higgs boson good for?
Answer: without Higgs field we would not exist!
E.g.
It gives mass to the electron: without electron mass no atoms (r1/me)
It gives mass to the W,Z bosons, which make weak interactions weak at low energy, so the sun shines for 8 billion years
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Outline
Evidence for a Higgs particle in CMSIs it Peter´s Higgs or just a Higgs?What it has to do with the “origin of mass” in the universe?What is the Higgs boson good for? What is so special about the observed Higgs particle?
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What is so special about the Higgs boson?
Higgs mass below 130 GeV, as PREDICTED by SUSY!
W. Hollik: for me the observed Higgs boson with a mass consistent with Supersymmetry is the strongest hint for Supersymmetry!
H(SM,
1 doublet)
h,H,A,H+,H-
(MSSM, 2 doublets)
h1,h2,h3,a1,a2,H+,H-
(NMSSM, 2 doublets, 1 singlet)
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Other beautiful SUSY features
SUSY provides UNIFICATION of gauge couplings
SUSY provides UNIFICATION of Yukawa couplings
SUSY has no quadratic divergencies Higgs mass can be calculated up to unification scale SUSY predicts EWSB with lightest Higgs below 130 GeV LHC: Mh = 126 GeV
SUSY provides „dark matter miracles“: Neutralino annihilation x-section a few pb correct relic density Neutralino-nucleon scattering cross section < 10-8 pb consistent with experimental limits
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Unification for TeV SUSY massesU
. Am
aldi
, WdB
, H. F
ürst
enau
, PLB
, 199
1,
wdb
. C, S
ande
r, PL
B 2
004,
hep
-ph/
0307
049
i are gauge couplings of SU(3)SU(2)LU(1) (in first order i 1/log (energy Q)
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Common masses at GUT scale:m0 for scalarsm1/2 for S=1/2 gauginosm1,m2 for Higgs bosons
m2 driven negative by top loops ,electroweak symmetry breaking at MZ for 140<Mt<200 GeV!
BINGO, Mtop predicted in this rangeby SUSY and it was found at171 ± 1.3 GeV!
Higgs mechanismus predicted in SUSY
EWSB only works if starting point at GUT scale not too large:need m EW scale, but it is termof supersymm. potential, could beGUT scale (m-problem)
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<S> is m term of MSSM. If m is vev from singlet S, no problem to be small. Now 3 scalar Higgs bosons! (and 2 pseudoscalar)
NMSSM solves m-problem
MSSM NMSSM
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Higgs mass in MSSM and NMSSM
MSSM
Higgs mass in MSSM 125 GeV for mstop 3 TeV
NMSSM: mixing with singlet
increases Higgs mass at BORN level for small tan and large NO MULTI-TEV stops needed
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Branching ratios in NMSSM may differ from SM
Total width of 126 GeV Higgs tot may be reduced somewhat by mixing with singlet (singlet component does not couple to SM particles).
Then branching ratios enhanced, e.g. BR(H gg(ggtot enhanced (enhancement may be
reduced by light stops at gluon fusion loop by neg. interference with top loops)
Main decay mode BR(H bbar(bbartot hardly effected, as long as (bbar tot
Higgs with largest singlet component usually lightest one. Since it has small couplings to SM particles, it is NOT excluded by LEP limit.
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Many papers on NMSSM after Mh=126 GeV and hint of too high Br into gg, see arXiv:1301.6437, arXiv:1301.1325, arXiv:1301.0453, arXiv:1212.5243, arXiv:1211.5074, arXiv:1211.1693, arXiv:1211.0875, arXiv:1209.5984, arXiv:1209.2115, arXiv:1208.2555, arXiv:1207.1545, arXiv:1206.6806, arXiv:1206.1470, arXiv:1205.2486, arXiv:1205.1683, arXiv:1203.5048, arXiv:1203.3446, arXiv:1202.5821, arXiv:1201.2671, arXiv:1201.0982, arXiv:1112.3548, arXiv:1111.4952, arXiv:1109.1735, arXiv:1108.0595, arXiv:1106.1599, arXiv:1105.4191, arXiv:1104.1754, arXiv:1101.1137, arXiv:1012.4490, ………..
Status of NMSSM
NMSSM consistent with h1=95 GeV, h2=126 GeV, motivated by 2 excess observed at LEP at 95 GeV with signal strength 2 well below SM.
Hard to discover at LHC, may be in decay mode h3h2+h1
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Determining allowed SUSY parameter range
Variables calculated withNMSSMTools 3.2.4 usingUlrich Ellwanger*, John F. Gunion**, Cyril Hugonie*** http://www.th.u-psud.fr/NMHDECAY/nmssmtools.html
MicrOMEGAs 2.4.1G. Bélanger, F. Boudjema, P. Brun, A. Pukhov, S. Rosier-Lees, P. Salati, A. Semenov http://lapth.in2p3.fr/micromegas/
Minuit for minimization
LHC limits on squarks and gluinos. Mh=126 GeV
These dominate parameter space
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Allowed parameter space
LHCXenon
+MA
B smm
LEP
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LHC exclusion at 7 and 14 TeV
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Expected Higgs masses in NMSSM
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50Wim de Boer Time and Matter, Venice, March 2013
Expected Higgs decays in NMSSM
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51Wim de Boer Time and Matter, Venice, March 2013
Expected Higgs x-sections in NMSSM
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52Wim de Boer Time and Matter, Venice, March 2013
Expected coupling precision (SM)
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53Wim de Boer Time and Matter, Venice, March 2013
Summary
Higgs boson at 126 GeV well established
All properties (Br and Spin) consistent with SM Higgs boson
Higgs hunt not over, since mass in range expected from Supersymmetry, which predicts more Higgs bosons
Hopefully a Higgs comes seldom alone
Need Br at level of a few % to check possible deviations expected in NMSSM
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54Wim de Boer Time and Matter, Venice, March 2013
From Concept to Data Taking: 18 years
CMS cut in mid-plane
Letter of Intent (1992)Technical Proposal (1995)10 Technical Design Reports (1997-2006)3000 scientists from 40 countries
Silicon Tracker
Hermetic electromagnetic calorimeterScintillating Crystals
Hermetic Hadron Calori-meter: Brass scintillatorMuon
Chambers
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55Wim de Boer Time and Matter, Venice, March 2013
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56Wim de Boer Time and Matter, Venice, March 2013
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61Wim de Boer Time and Matter, Venice, March 2013