The BTeV Experiment: Physics in addition to Detector FPCP 2003 K. Honscheid Ohio State Univ

The BTeV Experiment: Physics in addition to Detector FPCP 2003 K. Honscheid Ohio State Univ www.phwiki.com

The BTeV Experiment: Physics in addition to Detector FPCP 2003 K. Honscheid Ohio State Univ

Morey, Jennifer, Features Writer has reference to this Academic Journal, PHwiki organized this Journal The BTeV Experiment: Physics in addition to Detector FPCP 2003 K. Honscheid Ohio State University More details can be found at www-physics.mps.ohio-state.edu/~klaus/research/cipanp.pdf in addition to the BTeV web site at fnal.gov B Physics Today CKM Picture okay CP Violation observed No conflict with SM sin(2b) = 0.734 +/- 0.054 >1011 b hadrons (including Bs) B Physics at Hadron Colliders Energy 2 TeV 14 TeV b cross section ~100 mb ~500 mb c cross section ~1000 mb ~3500 mb b fraction 2×10-3 6×10-3 Inst. Luminosity 2×1032 >2×1032 Bunch spacing 132 ns (396 ns) 25 ns Int./crossing <2> (<6>) <1> Luminous region 30 cm 5.3 cm Tevatron LHC Large cross sections Triggering is an issue All b-hadrons produced (B, Bs, Bc, b-baryons)

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Detector Requirements From F. Teubert Trigger, trigger, trigger Vertex, decay distance Momentum PID Neutrals (g, p0) Forward vs. Central Geometry b production angle b production angle bg Multi-purpose experiments require large solid angle coverage. Central Geometry (CDF, D0, Atlas, CMS) Dedicated B experiments can take advantage of Forward geometry (BTeV, LHCb) The BTeV Detector

Pixel Vertex Detector Reasons as long as Pixel Detector: Superior signal to noise Excellent spatial resolution – 5-10 microns depending on angle, etc Very Low occupancy Very fast Radiation hard Special features: It is used directly in the L1 trigger Pulse height is measured on every channel with a 3 bit FADC It is inside a dipole in addition to gives a crude st in addition to alone momentum Doublet The Pixel Detector II Simulated B Bbar, Pixel Vertex Detector

Level 1 vertex trigger architecture L1 vertex trigger algorithm Generate Level-1 accept if “detached” tracks in the BTeV pixel detector satisfy: (GeV/c)2 cm Efficiencies in addition to Tagging For a requirement of at least 2 tracks detached by more than 6s, we trigger on only 1% of the beam crossings in addition to achieve the following trigger efficiencies as long as these states (<2> int. per crossing): 1% Impact Parameter in units of s Impact Parameter in units of s Trigger Efficiency-Minimum Bias Events Trigger EfficiencyBsDsK E F F I C I E N C Y E F F I C I E N C Y N=1 N=2 N=3 N=4 N=1 N=2 N=3 N=4

The Physics Goals There is New Physics out there: Baryon Asymmetry of Universe & by Dark Matter Hierarchy problem Plethora of fundamental parameters B Experiments at Hadron Colliders are well positioned to: Per as long as m precision measurements of CKM Elements with small model dependence. Search as long as New Physics via CP phases Search as long as New Physics via Rare Decays Help interpret new results found elsewhere (LHC, neutrinos) Complete a broad program in heavy flavor physics Weak decay processes, B’s, polarization, Dalitz plots, QCD Semileptonic decays including Lb b & c quark Production Structure: B(s) spetroscopy, b-baryon states Bc decays Importance of Particle Identification BTeV RICH Detector Measuring a Using Borp p+p-po A Dalitz Plot analysis gives both sin(2a) in addition to cos(2a) (Snyder & Quinn) Measured branching ratios are: B(B-rop-) = ~10-5 B(Bor-p+ + r+p-) = ~3×10-5 B(Boropo) <0.5x10-5 Snyder & Quinn showed that 1000-2000 tagged events are sufficient Not easy to measure p0 reconstruction Not easy to analyze 9 parameter likelihood fit Slow p0’s Nearly empty (r polarization) Dalitz Plot as long as Borp Yields as long as Borp Based 9.9x106 background events Bor+p- 5400 events, S/B = 4.1 Boropo 780 events, S/B = 0.3 g g po Background Signal mB (GeV) mB (GeV) Boropo Our Estimate of Accuracy on a Geant simulation of Borp, ( as long as 1.4x107 s) Example: 1000 Borp signal + backgrounds With input a=77.3o Electromagnetic Calorimeter The main challenges include Can the detector survive the high radiation environment Can the detector h in addition to le the rate in addition to occupancy Can the detector achieve adequate angle in addition to energy resolution BTeV will have a high resolution PbWO4 calorimeter Developed by CMS as long as use at the LHC Large granularity Block size 2.7 x 2.7 x 22 cm3 (25 Xo) ~11000 crystals Photomultiplier readout (no magnetic field) Pre-amp based on QIE chip (KTeV) Energy resolution Stochastic term 1.8% Constant term 0.55% Position resolution Electromagnetic Calorimeter Tests Block from China’s Shanghai Institute Resolution (energy in addition to position) close to expectations This system can achieve CLEO/BaBar/BELLE-like per as long as mance in a hadron Collider environment! Rare b Decays Search as long as New Physics in Loop diagrams New fermion like objects in addition to t, c or u New Gauge-like objects in addition to W, Z or g Inclusive Rare Decays including bsg bdg bsl+l- Exclusive Rare Decays such as Brg, Kg BKl+l- Dalitz plot & polarization g, l+l- BoKg Polarization in BoKom+m- BTeV data compared to Burdman et al calculation Dilepton invariant mass distributions, as long as ward-backward asymmetry discriminate among the SM in addition to various supersymmetric theories. (Ali, Lunghi, Greub & Hiller, hep-ph/0112300) One year as long as Kl+l-, enough to determine if New Physics is present Muon System track from IP toroid(s) / iron ~3 m 2.4 m half height Provides Muon ID in addition to Trigger Trigger as long as interesting physics states Check/debug pixel trigger fine-grained tracking + toroid St in addition to -alone mom./mass trig. Momentum “confirmation” Basic building block: Proportional tube “Planks” Summary Heavy quark physics at hadron colliders provides a unique opportunity to measure fundamental parameters of the St in addition to ard Model with no or only small model dependence discover new physics in CP violating amplitudes or rare decays. interpret new phenomena found elsewhere (e.g. LHC) Some scenarios are clear others will be a surprise This program requires a general purpose detector like BTeV with an efficient, unbiased trigger in addition to a high per as long as mance DAQ a superb charged particle tracking system good particle identification excellent photon detection Additional Transparencies Morey, Jennifer Times-Standard Features Writer www.phwiki.com

Physics Reach (CKM) in 107 s A simplified trigger comparison From U. Egede From N. Harnew dg = c

Pixel Test Beam Results Track angle (mr) No change after 33 Mrad (10 years, worst case, BTeV) Analog output of pixel amplifier be as long as e in addition to after 33 Mrad irradiation. 0.25m CMOS design verified radiation hard with both g in addition to protons. Forward Tracker Predicted per as long as mance – Momentum resolution is better than 1% over full momentum in addition to angle range Prototype Straw tracker being constructed as long as FNAL beam test summer/fall 2002 Drawing Of as long as ward Microstrip tracker HPD Schematic as long as BTeV RICH HPD Tube HPD Pixel array HPD Pinout Pulse Height from 163 pixel prototype HPD. Note pedestal, 1, 2, 3 pe peaks

PbWO4 Calorimeter Properties Property Value Density(gm/cm2) 8.28 Radiation Length(cm) 0.89 Interaction Length(cm) 22.4 Light Decay time(ns) 5(39%) (3components) 15(60%) 100(1%) Refractive index 2.30 Max of light emission 440nm Temperature Coefficient (%/oC) -2 Light output/Na(Tl)(%) 1.3 Light output(pe/MeV) into 2” PMT 10 Property Value Transverse block size 2.7cm X 2.7 cm Block Length 22 cm Radiation Length 25 Front end Electronics PMT Inner dimension +/-9.8cm (X,Y) Energy Resolution: Stochastic term 1.8% (2.3%) Constant term 0.55% Spatial Resolution: Outer Radius 140 cm-215 cm $ driven Total Blocks/arm 11,500

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