Recent results from the Collider Detector at Fermilab (for the CDF collaboration) Rob Snihur (McGill...
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Transcript of Recent results from the Collider Detector at Fermilab (for the CDF collaboration) Rob Snihur (McGill...
![Page 1: Recent results from the Collider Detector at Fermilab (for the CDF collaboration) Rob Snihur (McGill University) CAP Congress 2007 – Saskatoon Energy Frontier.](https://reader037.fdocuments.in/reader037/viewer/2022110210/56649e5d5503460f94b55ba6/html5/thumbnails/1.jpg)
Recent results from theCollider Detector at Fermilab
(for the CDF collaboration)
Rob Snihur (McGill University)
CAP Congress 2007 – SaskatoonEnergy Frontier and Phenomenology I
June 19, 2007
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Outline• CDF • Physics program• Higgs• Beyond the Standard Model
– MSSM Higgs – Large Extra Dimensions: Pierre-Hugues Beauchemin (this afternoon 14:15)
• Top quark– Mass: Sebastian Carron (next talk)– Production Mechanism: Shabnaz Pashapour (this session)
• QCD– Di-b-jet cross section: Greg Williams (this session)– Exclusive gamma-gamma– Z + jets
• Electroweak– W mass: William Trischuk (yesterday)– WZ production
• b physics– Bs mixing– Sigma b observation– Cascade b observation
• Summary
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Canadian CDF institutionsUmbrella organization: IPP
• University of Alberta– Bryan Caron, Andrew Hamilton,
James Pinfold, Long Zhang
• McGill University– Adrian Buzatu, Phillipe Roy, Rob Snihur,
Andreas Warburton, Greg Williams
• University of Toronto– Hugo Beauchemin, Sebastian Caron, Dan
MacQueen, Shabnaz Pashapour, Pierre Savard, Teresa Spreitzer , Pekka Sinervo, William Trischuk
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Tevatron
• Integrated luminosity: 3 fb-1 delivered, 2.5 fb-1 on tape• Projection: “base” = 4 fb-1, “design” = 8 fb-1
• Highest instantaneous luminosity = 292.3 x 1030
~5 interactions
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CDF
Upgrades for Run II:– New tracking system
• COT, silicon tracker
– New forward calorimetry– Tracking at trigger level
• Tracks at L1
• Displaced from PV@L2
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Some CDF results for Winter 2007
• QCD– b-bbar dijet production– Z+jets cross section measurement – Z b-bbar– Dijet production cross section
measurement (1.13 fb-1 )• B Physics
– Lifetime measurements:• B+, B0, Bs and B (1fb-1)
– Rare decay searches: • B++- K+, B0+- K*, Bs+-
(1fb-1)• Bhh
• Electroweak– Observation of WZ production– Evidence for ZZ production– W mass, width
• Top– Top mass in all-jets channel– Production cross section
(lepton+isolated track)– Search for W' in the single top sample– Top Production Mechanism (gg vs qq)– Top Charge
• New Phenomena– Search for Large Extra Dimensions– Search for New Particles Coupling to
Z+jets (b'->Z+b) in 1.1 fb-1
– SUSY trilepton combined limit - 0.7 to 1 fb-1
– High-mass dielectron (Z’ search) - 1.3 fb-1
• Higgs (fb-1)– H SUSY Higgs– HWW ME-based analysis – ZHllbb 2D-NN and MET fitter
analysis
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Tevatron: close to 2 publications / week
mb -
b -
nb -
pb -
fb -
100 120 140 160 180 200
- - -
Higgs Mass [GeV/c2]
Total Inelastic
bb
WZ
tt-
-
HiggsWH,ZH
jets (qq, qg, gg)ob
serv
ed
WZ, Single Top, ZZ
MW ~0.05%
Mtop ~1%
Bs–Bs OscillationDiscovery +
Precision Meas.
MHiggs < 144 GeVat 95% CL
-
Reach 10-19 m
Low Mass SUSY
Road to the Higgs!
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A direct path towards the Higgs
• Light or heavy Higgs?
• Strong b-tagging, large lepton coverage– X-section shows that
we must use channels with large BF (no )Production
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Higgs searches combined
• Last update in mid March (new CDF result on WW, ZH)
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Higgs WW• Matrix Element method• Expected background = 286.1 +- 23.3
background• Expected signal (160 GeV) = 3.9 +- 0.3• Observed 323 candidates• < 1.3 pb (95% C.L)• 10 Higgs mass hypotheses are shown
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ZH ll bb
• Both ee & uu channels• Small background
– Mostly Z+jets
• Neural network– Discriminates event kinematics
against Z+jets & tt background
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MSSM Higgs Tau Tau
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Exclusive gamma gammaAndrew Hamilton, Bryan Caron, James Pinfold
(University of Alberta)
• 2 central EM showers with ET > 5 GeV
• 3 events observed, consistent with
• Background = 0.09 +- 0.04 events
• Significance = 3.7 • Cross section < 410 fb• May constrain exclusive
Higgs predictions at LHC
p
p
g
g
g
dijet, , c, Higgs
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Z + jets
• 1.1 fb-1
• Zee
• pT(jet) > 30 GeV|y(jet)| < 2.1
• NLO agrees with data
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First observation of WZ
Prob(background only) < 1.5 10-7 (5.1)
(WZ)=5.0+1.8-1.6(stat.+syst.)
pb
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First observation ofBs oscillations
• PRL 97, 24003 2006• Number of Bs decays
– 5600 fully reconstructed hadronic– 3100 partially reconstructed hadronic– 61500 partially reconstructed
semileptonic
ms=17.77±0.10(stat)±0.07(syst) ps-1 > 5 effect
• Same data set used for previous (spring 06) limit
• Improved selection• Improved analysis technique
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First observation of b
• Fully reconstructed decay modes
• Likelihood ratio (no bb states) = 2.6 x 10-19
m(Σb+) = 5808+2.0-2.3(stat.) ± 1.7(syst.) MeV/c2
m(Σb¯) = 5816+1.0-1.0(stat.) ± 1.7(syst.) MeV/c2
m(Σb*+) = 5829+1.6-1.8(stat.) ± 1.7(syst.) MeV/c2
m(Σb*¯) = 5837+2.1-1.9(stat.) ± 1.7(syst.) MeV/c2
0(*)bb
c pK
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Observation of b
• First ~2 fb-1 analysis• Use standard decay chain
to select candidate events• Use silicon hits to track • Topology similar to
B+ J/ K+• Significance = 7.8 • Mass = 5,792.9 +- 2.4(stat)
+- 1.7(syst) MeV/c2
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Example of Possible Fermilab Roadmap
ILC EDR + R&DILC System Test1-2 RF Units
Energy Frontier:
Beyond ILC/LHC Reach: R&D for higher energy lepton and hadron colliders
LHC LHC Upgrade
beams from Booster, Main Injector protonsMiniBooNE, SciBooNE, MINOS, MINERvA, NOvA
TevatronRunning
TevatronPhysics
Intensity Frontier: High Intensity Protons
ILC Construction
ILC Decision
ReconfiguringAccelerator
Complex
, , K, p beams
-
ILC CrymoduleIndustrialization
Running 2 GeV + 6 GeV Linac+ Recycler
+ Main InjectorRunning
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Summary• Broad physics program at CDF
– High pT– B physics
• New results on – SM & MSSM Higgs searches– QCD
• Exclusive gamma gamma production• Z + jets
– B physics• Bs oscillations• Sigma b observation
• More results presented at this conference– W mass– Large Extra Dimensions– B jet cross section– Top quark
• Mass• Gluon-gluon vs quark quark
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ISL Cooling: Physics Impact
• Five Layer SVX is core of system– B-tagging– Lifetime measurements– Silicon vertex triggers use SVX alone
• Layer 00– Improve vertex (eg B-tag) with point at beam pipe
• ISL– Not required for good B-tagging– High Lum point to help connect COT and SVX– High eta (||<2) tracking for forward electrons
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Single Top
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Tevatron Collisions• The hard scattering is not all
there is!– Parton Distribution Functions
(PDF): fraction of (anti)proton carried by incoming partons.
– Underlying Event (UE): extra stuff produce by spectator or multiple interactions.
– Initial and Final State Radiation (ISR, FSR): extra gluons radiating off the original/final partons.
– Jets: fragmentation of quark/gluons and recombination into hadrons reconstructed inside a cone.
.
All of these processes, and more, have an impact on what we measure
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Summary
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WH->lbb : Cut based AnalysesSingle b-tagged w/NN
CDF results:
Expect 95% C.L limit (mH =115 GeV)
< 2.2 pb (< 17 times over SM)
Observed limits:
< 3.4 pb( < 26 times over SM)
D0 results:
Expect 95% C.L limit (mH =115 GeV)
< 1.1 pb(< 9 times over SM)
Observed limits:
< 1.3 pb(< 11 times over SM)
Cross section limitRatio over SM
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Gluino vs. squark mass exclusion
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Chargino and Neutralino searches• Both experiments look for SUSY
signals– Chargino and neutralino are produced
with sizeable cross sections– More difficult search for squarks and
gluinos
R. Strohemer
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Non SM Higgs
• Non SM Higgs(es) have sizeable decay rate to pairs– Large efforts to bring up efficiency to trigger
on tau events (and to detect tau)
R. Strohemer