Accelerator Based Particle Physics Experiments Su Dong Stan as long as d Student Orientat
Christie, Jim, Fiscal Reporter has reference to this Academic Journal, PHwiki organized this Journal Accelerator Based Particle Physics Experiments Su Dong Stan as long as d Student Orientation SLAC session Sep/16/2010 The Fundamental Questions Are there undiscovered principles of nature: new symmetries, new physical laws How can we solve the mystery of dark energy Are there extra dimensions of space Do all as long as ces become one Why are there so many kinds of particles What is dark matter How can we make it in the laboratory What are neutrinos telling us How did the universe come to be What happened to antimatter Accelerator Based Particle Physics Programs
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ATLAS @ LHC Physics Road map in addition to Detector Evolution Stage 0: 2012 Stage 1: 2015-6 Stage 2: 2020 2015 Physics Opportunities Higgs particle SuperSymmetry Large extra-dimensions The unexpected SLAC physics strategy: Initial emphasis on physics signature tools (b-tag,jet/missingEt) in addition to trigger. Use St in addition to ard Model measurements with early data to validate these tools to prepare as long as searches of new physics beyond St in addition to ard Model. Current SLAC physics analyses New physics search in addition to top cross section measurement with b-tag in addition to missing Et Search as long as long lived new particles Lepton jets Heavy fermions->same sign dileptons Boosted W Close collaboration with SLAC theory group
SLAC Involvement in ATLAS 2 Faculty + 1 Panofsky fellow 17+ Staff physicists & professionals 7 Postdocs 6 Grad students & Tier2 computing center staff Experimental Involvement Pixel vertex detector in addition to tracking High Level Trigger in addition to DAQ Simulation Tier-2 computing center ATLAS Detector Upgrades Opportunities to develop wide variety of experimental skills Contact Info Prof. Ariel Schwartzman email@example.com as long as d.edu (resident at CERN) Prof. Su Dong firstname.lastname@example.org as long as d.edu Dr. Charlie Young email@example.com as long as d.edu Detailed info on ATLAS@SLAC as long as students: http://www.slac.stan as long as d.edu/exp/atlas/students/ Dr. Andy Haas firstname.lastname@example.org as long as d.edu BaBar @ PEP-II & superB @ Frascati
BaBar Physics CP violation in B0 decays Data taking ended Apr/08. 465M BB events 630M cc events 460M tt events Largest sample of Upsilon resonance data 2-photon, ISR BaBar Analysis Opportunities Analysis topics: ISR->hadronic final states B/D decay Dalitz analysis Radiative B decays fDs Charmonium like resonances Prof. David Leith email@example.com as long as d.edu Dr. Blair Ratcliff firstname.lastname@example.org as long as d.edu Focusing DIRC prototype now in Research Yard Radiator: 1.7 cm thick, 3.5 cm wide, 3.7 m long fused silica bar (the same used in the BaBar DIRC). Optical expansion region: filled with mineral oil to match the fused silica refraction index (KamL in addition to oil). include optical fiber as long as the electronics calibration. Focusing optics: spherical mirror with 49cm focal length focuses photons onto a detector plane. Now being tested with new electronics:
Focusing DIRC prototype photon detectors Nucl.Inst.&Meth., A 553 (2005) 96 Timing resolutions were obtained using a fast laser diode in bench tests with single photons on pad center. 1) Burle 85011-501 MCP-PMT (64 pixels, 6x6mm pad, sTTS ~50-70ps) 2) Hamamatsu H-8500 MaPMT (64 pixels, 6x6mm pad, sTTS ~140ps) 3) Hamamatsu H-9500 Flat Panel MaPMT (256 pixels, 3x12mm pad, sTTS ~220ps) Cherenkov light: tagging color by time Cherenkov angle production controlled by nphase: cos c = 1/(nphaseb), nphase(red) < nphase(blue) => c < c Propagation of photons is controlled by ngroup ( nphase) : vgroup = c0 /ngroup = c0 /[nphase - phase vgroup(red) > vgroup (blue) Analytical calculation: Data from the prototype: Geant 4 – without in addition to with pixilization: dTOP/Lpath [ns/m] = TOP/Lpath(l) – TOP/Lpath (410nm) Chromatic growth rate: s ~ 40ps/m dTOP/Lpath [ns/m] dTOP/Lpath [ns/m] Future We are building a new full size prototype as long as Super B with new fused silica focusing elements Will be starting tests in Cosmic Ray Telescope in the SLAC Research Yard this year Excellent opportunity as long as h in addition to s-on R&D with a innovative new detector.
HPS is a new, small experiment which offers the thesis student exposure to all aspects of experimental particle physics, from experiment design in addition to optimization, to hardware construction, installation in addition to commissioning, in addition to data analysis. Rotation Projects: https://confluence.slac.stan as long as d.edu/display/hpsg/Rotation+Projects+in+Heavy+Photon+Search John Jaros What is a Heavy Photon A heavy photon (A) is a new, ~100 MeV spin one, as long as ce-carrying particle that couples to an analogue of electric charge. Because it will mix with our photon, it couples to electrons, albeit weakly: Heavy photons can be produced by electron bremstrahlung off heavy targets in addition to they decay to e+e A heavy photon appears as an e+e- resonance on a large background of QED tridents. Heavy photons can travel detectable distances be as long as e decaying, providing a unique signature. g = e Why Consider Heavy Photons Are there are additional U(1)s in Nature If so, theyll show up by mixing with our photon, inducing weak couplings to electric charge. Heavy Photons could mediate Dark Matter annihilations. Their decays may explain excess high energy electrons in addition to positrons in the cosmic rays; their interactions may account as long as the DAMA dark matter detection. Pamela Positron Excess
SLAC Activities on HPS in addition to APEX SLAC Heavy Photon Group is engaged in two projects: HPS (Heavy Photon Search) has just submitted a proposal to JLab Review next week at JLab workshop; approval this Fall Hope to engineer, construct, test, install by Spring 2012 Building Si tracker/vertexer, targets, in addition to SVT data acquisition system GOOD PROJECTS FOR ROTATION STUDENTS APEX (A Prime Experiment) utilizes two large existing spectrometers in Jlabs Hall A to search as long as heavy photons SLAC built targets, helped with test run, in addition to is developing analysis SLAC will continue helping run in addition to analyze APEX Contact: John Jaros email@example.com as long as d.edu Si Tracker APV25 Readout
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