Scan for Higgs Amitabh Lath Rutgers The State University of NJ Rutgers University September 7 2005Slide 2
What is the Higgs? Short answer : Field/Particle in charge of mass. Longer answer : Completes the Standard Model of Particles and Fields. So what is this Standard Model of P & F? Rutgers University September 7,2005Slide 3
Our Periodic Table Rutgers University September 7,2005Slide 4
Our Periodic Table Quark stuff: hadrons. 3q baryon q-anti(q) meson Q=2/3 - 1/3 0 1 + Higgs! (not yet discovered) Rutgers University September 7,2005Slide 5
Experimentalist View: Prologue Einstein, photoelectric impact J.J. Thomson, 1897 Street and Stevenson, 1937 cloud chamber Rutgers University September 7,2005Slide 6
Experimentalist View: Weak Effects Reines and Cowan Reactor (beta rot) Lederman, Schwartz and Steinberger bunch utilizing AGS pion shaft Rutgers University September 7,2005Slide 7
Experimentalist View: Quarks Kendall, Friedman, Taylor amass at SLAC. Gell-Mann\'s quarks Feynman\'s "partons" Rutgers University September 7,2005Slide 8
Experimentalist View: Quarks Gell-Mann predicts Omega-molecule. Found by air pocket chamber assemble at BNL (Samios et al) Rutgers University September 7,2005Slide 9
Experimentalist View: Quarks The abnormal molecule rot, K L mm not as productive as anticipated Glashow, Iliopoulos, and Maiani set "another" molecule. (GIM Mechanism) Diagrams with "appeal" damagingly meddle. Found by Ting, Richter bunches (at the same time) at BNL, SLAC. Rutgers University September 7,2005Slide 10
Experimentalist View: 3 rd Generation Note: S q for every era = 0 Fermilab collider program (cast of hundreds) Fermilab settled target explore (Lederman) Beautiful investigation by Martin Perl at SLAC\'s SPEAR Rutgers University September 7,2005Slide 11
Experimentalist View: Weak Bosons Glashow, Weinberg and Salaam present two primordial fields: Weak Isospin Weak Hypercharge that blend (powerless blending edge) to give W,Z and g + Higgs! They likewise present a scalar field (Higgs). W, Z found by UA2 Rutgers University September 7,2005Slide 12
Electro-Weak Unification Weak Isospin (3-segment) W 1 + iW 2 = W + W 1 – iW 2 = W - Weak Hypercharge (1-part) g cos q w - sin q W 3 Z sin q w cos q w B 0 Left Handed Int. just ! = Weak Mixing Angle Rutgers University September 7,2005Slide 13
Higgs and ElectroWeak Unification Adding scalar field to Lagrangian gives mass-like terms, prompting to Masses of bosons dictated by couplings, and parameters of the scalar field potential (v, l ). M higgs is a free parameter. Each of the three things in this condition can be measured by analyses. M W/M Z = cos q W Rutgers University September 7,2005Slide 14
What is Higgs? Scalar Field. Presented in : A MODEL OF LEPTONS Steven Weinberg , Phys.Rev.Lett.19:12641266,1967 . Offers mass to everything, except Higgs boson not seen. Fermion masses? Require (self-assertive) couplings. Called G i in Halzen & Martin. M H < 246 GeV/c 2 (attack of all EW information and top mass) Rutgers University September 7,2005Slide 15
Different Types of Higgs SM Higgs One (complex) doublet. Cross segment for direct creation at Tevatron depressingly low. Hypothetical issues. Past SM Higgs Different models settle (a few) SM issues. Tevatron can contend in a few sections of parameter space . Rutgers University September 7,2005Slide 16
Problems with Higgs Fundamental Scalar Field has issues. What are the redresses to its mass? Two essential sorts of arrangements: Higgs is a composite (Technicolor) Other outlines wipe out issues. (SUSY) Rutgers University September 7,2005Slide 17
Beyond SM Higgs (Technicolor) "pion" like composite Higgs. Techniquarks make technipions QCD-like solid compel ( thus "technicolor" ). Precluded! The electron-positron asymmetries at the Z post were not kind to this hypothesis. Nonetheless, a great deal of physicists have a weakness for compositeness . T = isospin breaking terms Rutgers University September 7,2005 S = Isospin cons. termsSlide 18
Beyond SM Higgs (Supersymmetry) The "GIM Mechanism" answer for the Higgs issue. Got an issue graph? Add another to offset it. Fermion sFermion Boson Bosino An extremely costly hypothesis. Duplicates the molecule range. Incidental awards: LSP Dark Matter? Unification of couplings? Rutgers University September 7,2005Slide 19
The MSSM Higgs Minimal SuperSymmetric Standard Model. Least difficult practical SUSY hypothesis. 3 impartial( h,A,H ), 2 charged Higgs Bosons (masses related). tan b proportion of up/down sort couplings . The LEP explore (e+e-collider) secured a vast swath of parameter space by decision out higgs up to 90 GeV. Rutgers University September 7,2005Slide 20
MSSM Higgs Production At huge tan b , both gg and bb creation contribute. s rises like tanb 2 . An, and h/H are created all the while. ~100 pb! For comprehensive mode , tt rot is extremely fascinating. Twofold this! ~SM Higgs Rutgers University September 7,2005Slide 21
Higgs Decays Higgs rots to bb 90% and tt 10% (Higgs couples to mass) higgs bb? No desire for comprehensive. higgs tt ? Yes! Rots to WW, ZZ assume control if Higgs is sufficiently overwhelming. Rutgers University September 7,2005Slide 22
Higgs Decays Most Higgs scans search for b-quarks. SM, SUSY higgses (ask SVS). Issue: "genuine" b-quarks from hadronic communication overwhelm those from Higgs. Around 6 requests of greatness! Regular arrangement: Look at "related" stuff: (Higgs+W/Z, Higgs+extra b-quarks) Our answer: Forget b. Search for tt. Surrender (a few) affectability to SM Higgs. Pick up a perfect channel for MSSM Higgs. Rutgers University September 7,2005Slide 23
CDF Tevatron Main Injector The Tevatron Accelerator p-pbar impacts at 1.96 TeV C.M. Vitality Rutgers University September 7,2005Slide 24
CDF Collaboration Missing Conway … Rutgers University September 7,2005Slide 25
The CDF Detector beampipe Collision point Superconducting Magnet Rutgers University September 7,2005Slide 26
Particle Detection Electron track, contained group, E/P~1 g , no track Quark matter ( p ) - track, amplified (hadron) bunch Muon infiltrating track Weak, no charge ( n ) Missing momenta Rutgers University September 7,2005Slide 27
Particle Detection s Electron track, contained bunch, E/P~1 g , no track Quark matter ( p ) - track, developed (hadron) bunch Muon entering track Weak, no charge ( n ) Missing momenta ~nb ~mb ~nb HIGGS? ~pb Rutgers University September 7,2005Slide 28
The tau lepton. 3 rd era lepton. Substantial. Mass = 1.77 GeV/c 2 Lots of rots Leptonic: t e nn , t mnn (17% each) Hadronic: t pn , pp 0 n , pppn , pp 0 p 0 n (64%) Shorthand: t e , t m , t h Rutgers University September 7,2005Slide 29
Looking for Higgs t n H n p , quark matter e or m Signal: One t goes to electron or muon. We know how to identify e, m Second t goes to pions Backgrounds? Z tt (irreducible) W e, m + "planes" (quark stuff including p ) Rutgers University September 7,2005Slide 30
Detecting taus? Taus are leptons that can rot to "planes" of pions. planes from q,g are fatter. Flag cone. Confinement cone (annulus). Up to 30 o . Veto tracks, p 0 … Should get: Characteristic 1,3 track improvement. |Q| = 1 m < 1.8 t e , t m Rutgers University September 7,2005 Standard cutsSlide 31
Problem with taus. Fakes from planes (as with nearly everything at hadron machines). t h IS a stream; but a limited one (pencil fly). Fly generation 100\'s m b. Contrast with 100\'s of pb for t creation. Don\'t know enough about JETS require fake rate from information . This is the place the issues begin. Distinctive wellsprings of planes give altogether different fake appraisals. Rutgers University September 7,2005Slide 32
Fake Rates. Preamble. CDF Run 1 (U.C. Berkeley) Jet activated specimens give bring down fake rates than lepton activated ones. Fake rates ascending with stream E T . What is going on? Enormous distinction! Rutgers University September 7,2005Slide 33
Solution: Multi-Parameter. Rather than parameterizing fake rate in one variable, we now utilize a few. Huge inconsistency in rates vanishes. Is this the proper thing to do? Why trouble? "Relative" fake rates Rutgers University September 7,2005Slide 34
Check of Fake Rate Predictor Newfangled multi-parameter fake rate capacity is unnerving. Fly factors (vitality, course, and so on) BLACK BOX likelihood of a fake t . We should test it on various specimens of planes. Stream activated specimen (expect one fly is "lepton") Photon+jet (utilize photon as lepton) W+jet. MC Jets. We should take a gander at various disseminations, not simply total numbers. Rutgers University September 7,2005Slide 35
Pure example of planes Predictor Fake rate forecast Checking Jet t Fake Rates Pure specimen of planes t reconst Fake rate measured Rutgers University September 7,2005Slide 36
Checking Fake Rates (QCD) This is an once-over to verify everything is ok, best case scenario, since we constructed our "black box" - fake indicator - utilizing Jet Triggered information. Rutgers University September 7,2005Slide 37
Checking Fake Rates ( g +jet) This is the most encouraging arrangement of plots . Rutgers University September 7,2005Slide 38
Checking Fake Rate (W+jet) Rutgers University September 7,2005Slide 39
tt signature Classic Hadronic tau signature Both t e t h and t m t h are incorporated into these plots N tracks = 1,3 and |Q
Scan for B + - > K + l + l - and B 0 - > K* 0 l + l - . Hypothetical forecasts and test status I ...
http://ci.nii.ac.jp/Fast guide < Watchword look > CiNii top page CiNii トップページ
Site design improvement (SEO) is the strategy by which website pages get a high page rank in web ...
This will discover records relating to craftsmanship universities and workmanship schools. ... d ...
2.1 Choosing Your Internet Access Device & Physical Connection: The Quest for ... 2.1 Choosing Y ...
I took lessons in water painting, pencil drawing, and oil painting with two craftsmanship coache ...
Interior Medicine Clerkship. Informatics Rotation. 2006-07. Foundation versus Foreground ... Try ...
It was taboo to talk the Zaghawa dialect in school. In elementary school, the instructor gave us ...
Pathfinders: for understudies by understudies as an inquiry procedure! What is a pathfinder? Aro ...
What are the famous components to search for when acquiring a skateboard? ... What are the promi ...
What is an A* Search?. A voracious hunt technique minimizes the expense to the objective by util ...
Altered Search Algorithm. INSERT(initial-node,FRINGE)Repeat:If FRINGE is vacant then return fail ...
Caching in Backtracking Search. Fahiem Bacchus University of Toronto. Introduction. Backtra ...
2. Looking. Consider the issue of looking a cluster for a given valueIf the exhibit is not sorte ...
The Problem. The User: \"I need my outcomes now!\"But...Over 4 billion web pagesOver 1 million i ...
What is NRT?. Look on records about as quick as they are indexedDelete archives in a way that is ...
Diagram. 1-Higgs Field: symmetry breaking, expansion and dull vitality (and conceivably the firs ...