DOCSLIB.ORG

Charm and QCD at CLEO-III and CLEO-C Jim Napolitano (RPI

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Charm and QCD at CLEO-III and CLEO-C Jim Napolitano (RPI Charm and QCD at CLEO-III and CLEO-c Jim Napolitano (RPI & Cornell) Physics topics: 0 − − + 1) Measurement of Ξc → pK K π (CLEO-III) 2) Form factors in D0 → {π−,K−}e+ν (CLEO-III ⇒ CLEO-c) 3) Disentangling glueballs and qq¯ states (CLEO-c) XXXIX Rencontres de Moriond QCD and High Energy Hadronic Interactions 28 March - 04 April, 2004 1 2230902-007 109 CLEO Integrated Luminosities CLEO Physics (1D) 8 CLEO Upgrades 10 ACP Limits RICH CESR Upgrades B I New DD Mixing Tracking Limit B K* 2cm BP CLEO III bs Silicon 7 He-propane 10 B K 9x5 Bunches B K SC IR Quads ear B / CLEO II.V Y SC RF I CsI 9x4 Bunches 3.5cm BP I BB / Crossing Angle 106 (BB Mixing) CLEO II 9X3 Bunches b u New Tracking 1 IR Ds CLEO I.V 5 b c 10 B Decay (4S), (5S) Microbeta CLEO I 7 Bunches Pretzel Orbits 104 1980 1985 1990 2 1995 2000 2005 CLEO III Solenoid 2230801-005 Coil RICH Calorimeter Drift Chamber Muon SC and Chambers Rare Earth Quads Silicon Magnet Vertex Detector Iron 3 0 − − + 1) Measurement of Ξc → pK K π See arXiv:hep-ex/0309020, to appear in Physical Review D 0 − ¯? 0 Physics: The decay Ξc → pK K (892) cannot proceed through external W decay, so it is “color suppressed”. ⇒ Want to separate it from nonresonant four-body decays. 0 − − + 0 − + Measured Ξc → pK K π rate relative to Ξc → Ξ π Needs extensive p, K, π particle identification made possible by RICH in CLEO-III Only previous result: ACCMOR 1990 (four events, all K¯ ?) 4 0 RESULTS: Ξc Decay 0 Ξc Decay modes 150 0990803-002 pK−K−π+ ) 2 100 K−π+ mass distribution: 50 Entries / 6 (MeV/c 0 2.30 2.40 2.50 2.60 I M(pK K I +) (GeV/c2) 100 0991203-003 Ξ−π+ ) 75 2 0 − − + B(Ξc → pK K π )/ 0 − + 50 B(Ξc → Ξ π ) = 0.35±0.06±0.03 25 Entries / 6 (MeV/c B(Ξ0 → pK−K−π+; No K¯ ?)/ 0 c 2.30 2.40 2.50 2.60 0 − + M( I +) (GeV/c2) B(Ξc → Ξ π ) = 0.21±0.04±0.02 5 2) Form Factors in D0 → {π−,K−}e+ν New CLEO-III analysis to be published soon. 2 dΓ G 2 µ µ + 2 3 2 For q ≡ p (W ) have = Vcq p F(q ) dq2 24π3 Note: First measurement of D → πeν form factor shape! Plus: New result for B(D0 → πeν)/B(D0 → Keν) 6 Signal and Background in CLEO-III 0 ?+ + 0 Identify D from D → πslowD Kinematic variable used is ∆M ≡ M(D?) − M(D) D0 → K−e+ν D0 → π−e+ν 1500 400 300 1000 200 500 100 0 0 0.12 0.17 0.22 0.27 0.32 0.12 0.17 0.22 0.27 0.32 ∆M (GeV/c2) ∆M (GeV/c2) ⇒ The challenge for D → πeν is significant! 7 0 − + 2 RESULTS: D → π e νe Normalized q Distribution All results are preliminary!! Form factor models Binned data points 0.60 0.50 0.40 1 dΓ Γdq2 × 0.30 Effic. 0.20 0.10 LOW MID HIGH 0.00 q2 (GeV2/c2) Plus: B(D0 → πeν)/B(D0 → Keν) = 0.097 ± 0.010 ± 0.010 8 2230104-002 CLEO-c Solenoid Coil Barrel Calorimeter Ring Imaging Cherenkov Detector Drift Chamber Inner Drift Chamber / SC Quadrupole Beampipe Pylon Endcap SC Calorimeter Quadrupoles Rare Earth Quadrupole Iron Polepiece Magnet Barrel Muon Iron Chambers 9 The CLEO-c Program ¯ Prologue: Completed Υ(1S), Υ(2S), Υ(3S), Υ(5S), ΛbΛb runs, and short runs carried out at ψ0(3686), ψ00(3770),... Dedicated Running in ∼1 Year Blocks −1 Act I: ψ(3770) 3 fb ⇒ 30M Events (for σDD¯ = 10 nb) ⇒ 6M Tagged D decays √ −1 Act II: s ≈ 4.1 GeV 3 fb ⇒ 300K Tagged Ds decays Act III: J/ψ(3097) 1 fb−1 ⇒ 1 Billion J/ψ decays Act I is already underway! Epilogue: ψ0(3686), R, . depending on time and resources 10 CLEO-c event: e+e− → ψ00(3770) → D0D¯ 0 0 − + 0 + − D → K e νe D¯ → K π 11 Signal and Background for D0 → π−e+ν in CLEO-c Monte Carlo Data (Preliminary!) Assumed 1 fb−1 Analyzed 60 pb−1 Particle ID cuts applied No particle ID cuts (yet) 0120601-002 600 0 I + D e D0 K eI + 500 400 300 200 Events / (0.005 GeV) 100 0 I I I 0.3 0.2 0.1 0 0.1 0.2 0.3 U = Emiss I Pmiss (GeV) 12 3) Disentangling Glueballs and qq¯ States Radiative J/ψ decay is an excellent glueball filter J/ψ → γgg → γ + glueball Lattice QCD says the lightest glueball is a scalar meson with a mass between 1500 and 1700 MeV/c2. The quark model says there are two scalar mesons in this mass region (i.e. |uu¯ + dd¯i ≡ |nn¯i and |ss¯i). Three states have been observed: f0(1370), f0(1500), f0(1710) ⇒What is the mixture of qq¯ and glueball? 13 Mark-III (SPEAR): 6 × 106 J/ψ J/ψ → γX, where X → ... 2 2 2 2 |a0,0| |a2,0| |a2,1| |a2,2| 3000 (a) (b) (c) (a) 2000 1000 K K 1000 S S 0 0 (d) (e) (f) (b) 2000 K+K− 1000 1000 Events/(0.1 GeV) Events/(0.1 GeV) 0 0 (g) (h) (i) (c) 1000 π+π− 1000 500 0 0 1.0 1.5 2.0 1.2 1.6 2.0 1.2 1.6 2.0 1.2 1.6 2.0 6-96 Mass (GeV) 7236A5 6-96 Mass (GeV) 7236A6 Data Points: A Bin-by-Bin (i.e. Mass Independent) Fit Solid Lines: A Mass Dependent Fit to the Data Points No sign of the f0(1500)? 14 Radiative Decays as a Probe of qq¯-Glueball Mixing F. E. Close, et al., Phys. Rev. D 67, 074031 (2003) M(glueball) < M(nn¯) ≡“L” M(nn¯) < M(glueball) < M(ss¯) ≡“M” M(glueball) > M(ss¯) ≡“H” Radiative Decay Widths in keV ΓTot f0 → γρ(770) f0 → γφ(1020) MeV State LMH LMH f0(1370) 443 1121 1540 8 9 32 ∼300 f0(1500) 2519 1458 476 9 60 454 109 f0(1710) 42 94 705 800 718 78 125 Excellent discrimination! −2 −4 ⇒ Expect B(f0 → γV ) ≈ 10 to 10 . −3 For B(J/ψ → γf0) ≈ 10 we should acquire 10, 000 to 100 events for 109 J/ψ. 15 Summary and Outlook • CLEO-III is still producing results This Conference: M. Shepherd and J. Duboscq See also: M. Dubrovin, Moriond QCD 2003, including D → πππ, D → Kππ, D → KKπ,... • CLEO-c well underway towards 3 fb−1 at ψ00(3770) Large sample of clean DD¯ pairs Hadronic and electroweak physics analyses started • Strong future program for CLEO-c ¯ + − γDD and Ds Ds production Goal of 109 J/ψ events Other physics opportunities Stay Tuned! Thank you! 16.
Load more

Recommended publications
  • Flavour Physics
    May 21, 2015 0:29 World Scientific Review Volume - 9in x 6in submit page 1 TASI Lectures on Flavor Physics Zoltan Ligeti Ernest Orlando Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720 ∗E-mail: [email protected] These notes overlap with lectures given at the TASI summer schools in 2014 and 2011, as well as at the European School of High Energy Physics in 2013. This is primarily an attempt at transcribing my hand- written notes, with emphasis on topics and ideas discussed in the lec- tures. It is not a comprehensive introduction or review of the field, nor does it include a complete list of references. I hope, however, that some may find it useful to better understand the reasons for excitement about recent progress and future opportunities in flavor physics. Preface There are many books and reviews on flavor physics (e.g., Refs. [1; 2; 3; 4; 5; 6; 7; 8; 9]). The main points I would like to explain in these lectures are: • CP violation and flavor-changing neutral currents (FCNC) are sen- sitive probes of short-distance physics, both in the standard model (SM) and in beyond standard model (BSM) scenarios. • The data taught us a lot about not directly seen physics in the past, and are likely crucial to understand LHC new physics (NP) signals. • In most FCNC processes BSM/SM ∼ O(20%) is still allowed today, the sensitivity will improve to the few percent level in the future. arXiv:1502.01372v2 [hep-ph] 19 May 2015 • Measurements are sensitive to very high scales, and might find unambiguous signals of BSM physics, even outside the LHC reach.
    [Show full text]
  • Incomplete Document
    Improved measurement of the Pseudoscalar Decay Constants fDS from D∗+ γµ+ ν data sample s → Abstract + − Determination of fDS using 14 million e e cc¯ events obtained with the CLEO → II and CLEO II.V detector is presented. New measurement of the branching ratio gives Γ (D+ µ+ν)/Γ (D+ φπ+) = 0.137 0.013 0.022. Using Γ (D+ µ+ν) = 0.036 S → S → ± ± S → 0.09, fDS was calculated and found to be (247 12 20 31) MeV. Comparison ± ± ± ± of these results with other theoretical and experimental results are also presented. 1 Introduction Purely leptonic decay modes of heavy mesons predict their decay constants, which is connected with measured quantities such as CKM matrix elements. Currently it is not possible to measure fB experimentally, but measurements of the Cabibbo-flavor pseudoscalar decay constants such as fDS is possible. This measurement provides a check of these theoretical calculations and helps to establish different theoretical models. + The decay width of Ds is given by [1] G2 m2 Γ(D+ ℓ+ν)= F f 2 m2M 1 ℓ V 2 (1) s 6π DS ℓ DS 2 cs → − MDS ! | | where MDS is the Ds mass, mℓ is the mass of the final state lepton, Vcs is a CKM matrix element equal to 0.974 [2] and GF is the Fermi coupling constant. Various theoretical predictions of fDS range from 190 MeV to 350 MeV. The relative widths of three lepton flavors are 10 : 1 : 10−5 for tau, muon and electron respectively. Helicity suppression reduces smaller width for low mass electron.
    [Show full text]
  • Design and Application of the Reconstruction Software for the Babar Calorimeter
    Design and application of the reconstruction software for the BaBar calorimeter Philip David Strother Imperial College, November 1998 A thesis submitted for the degree of Doctor of Philosophy of the University of London, and Diploma of Imperial College 2 Abstract + The BaBar high energy physics experiment will be in operation at the PEP-II asymmetric e e− collider in Spring 1999. The primary purpose of the experiment is the investigation of CP violation in the neutral B meson system. The electromagnetic calorimeter forms a central part of the experiment and new techniques are employed in data acquisition and reconstruction software to maximise the capability of this device. The use of a matched digital filter in the feature extraction in the front end electronics is presented. The performance of the filter in the presence of the expected high levels of soft photon background from the machine is evaluated. The high luminosity of the PEP-II machine and the demands on the precision of the calorimeter require reliable software that allows for increased physics capability. BaBar has selected C++ as its primary programming language and object oriented analysis and design as its coding paradigm. The application of this technology to the reconstruction software for the calorimeter is presented. The design of the systems for clustering, cluster division, track matching, particle identification and global calibration is discussed with emphasis on the provisions in the design for increased physics capability as levels of understanding of the detector increase. The CP violating channel Bo J=ΨKo has been studied in the two lepton, two π0 final state.
    [Show full text]
  • Charged Particle Tracking in the CLEO II Detector
    Charged Particle Tracking in the CLEO II Detector for Neutrino Reconstruction Michell Morgan Computer Science Department, Wayne State University, Detroit, Michigan, 48204 Abstract In neutrino reconstruction analyses, we rely on information from tracks from other particles in the event to determine the neutrino momentum. It is very important to nd out as much information as possible about those tracks for neutrino reconstruction. Currently, events with one or more tracks with no z t are not used, leading to an ineciency of about 15%. However, such tracks do have hits with z information on charge division wires which are ignored by the tracking program, because charge division hits z information has been observed to be very inaccurate on occasion. We have traced the inaccuracies to the z calibration which was performed only for central tracks and involved tting with a cubic polynomial. However, for forward tracks, the cubic leads to hits with z positions very far from the actual path of the track. We have investigated solutions to this problem so that we may be able to recover some z information on tracks in events that we currently throw away and use them in neutrino reconstruction. Introduction Neutrinos are neutral particles that pass through the detector at the speed of light. Because neutrinos are neutral and weakly interacting, they do not leave tracks in the detector nor hits in the calorimeter. Thus, for neutrino reconstruction, we have to know the energy and momentum of the other particles in the event. The total momentum of the colliding system is zero and thus the nal particles in the event must balance.
    [Show full text]
  • Measurement of Production and Decay Properties of Bs Mesons Decaying Into J/Psi Phi with the CMS Detector at the LHC
    University of Tennessee, Knoxville TRACE: Tennessee Research and Creative Exchange Doctoral Dissertations Graduate School 5-2012 Measurement of Production and Decay Properties of Bs Mesons Decaying into J/Psi Phi with the CMS Detector at the LHC Giordano Cerizza University of Tennessee - Knoxville, [email protected] Follow this and additional works at: https://trace.tennessee.edu/utk_graddiss Part of the Elementary Particles and Fields and String Theory Commons Recommended Citation Cerizza, Giordano, "Measurement of Production and Decay Properties of Bs Mesons Decaying into J/Psi Phi with the CMS Detector at the LHC. " PhD diss., University of Tennessee, 2012. https://trace.tennessee.edu/utk_graddiss/1279 This Dissertation is brought to you for free and open access by the Graduate School at TRACE: Tennessee Research and Creative Exchange. It has been accepted for inclusion in Doctoral Dissertations by an authorized administrator of TRACE: Tennessee Research and Creative Exchange. For more information, please contact [email protected]. To the Graduate Council: I am submitting herewith a dissertation written by Giordano Cerizza entitled "Measurement of Production and Decay Properties of Bs Mesons Decaying into J/Psi Phi with the CMS Detector at the LHC." I have examined the final electronic copy of this dissertation for form and content and recommend that it be accepted in partial fulfillment of the equirr ements for the degree of Doctor of Philosophy, with a major in Physics. Stefan M. Spanier, Major Professor We have read this dissertation and recommend its acceptance: Marianne Breinig, George Siopsis, Robert Hinde Accepted for the Council: Carolyn R. Hodges Vice Provost and Dean of the Graduate School (Original signatures are on file with official studentecor r ds.) Measurements of Production and Decay Properties of Bs Mesons Decaying into J/Psi Phi with the CMS Detector at the LHC A Thesis Presented for The Doctor of Philosophy Degree The University of Tennessee, Knoxville Giordano Cerizza May 2012 c by Giordano Cerizza, 2012 All Rights Reserved.
    [Show full text]
  • QCD Studies in Two-Photon Collisions at CLEO Vladimir Savinov University of Pittsburgh, Pittsburgh
    W03 hep-ex/0106013 QCD Studies in Two-Photon Collisions at CLEO Vladimir Savinov University of Pittsburgh, Pittsburgh We review the results of two-photon measurements performed up to date by the CLEO experiment at Cornell University, Ithaca, NY.These + − measurements provide an almost background-free virtual laboratory to study strong interactions in the process of the e e scattering. We discuss the measurements of two-photon partial widths of charmonium, cross sections for hadron pairs production, antisearch for glueballs ∗ and the measurements of γ γ → pseudoscalar meson transition form factors. We emphasize the importance of other possible analyses, favorable trigger conditions and selection criteria of the presently running experiment and the advantages of CLEOc—the future τ-charm factory with the existing CLEO III detector. 1. INTRODUCTION a time-of-flight (TOF) plastic scintillator system and a muon system (proportional counters embedded at various depths in One of the ways to study properties of strong interactions, the steel absorber). Two thirds of the data were taken with the surprisingly, is to collide high energy photons. Photons do not CLEO II.V configuration of the detector where the innermost interact strongly, however, in the presence of other photons drift chamber was replaced by a silicon vertex detector [4] and they can fluctuate into quark pairs that have a sizable probabil- the argon-ethane gas of the main drift chamber was changed ity to realize as hadrons. Space-like photons of relatively high to a helium-propane mixture. This upgrade led to improved energies can be obtained in the process of the e+e− scattering, resolutions in momentum and specific ionization energy loss that is, in the e+e− → e+e−hadrons reactions, where hadrons (dE/dx) measurements.
    [Show full text]
  • The CLEO RICH Detector Design
    SUHEP 20-2005 June, 2005 THE CLEO RICH DETECTOR M. Artuso a, R. Ayad a, K. Bukin a, A. Efimov a, C. Boulahouache a, E. Dambasuren a, S. Kopp a, Ji Li a, G. Majumder a, N. Menaa a, R. Mountain a, S. Schuh a, a a, a a T. Skwarnicki , S. Stone ∗, G. Viehhauser , J.C. Wang aDepartment of Physics, Syracuse University, Syracuse, NY 13244-1130, USA T.E. Coan b, V. Fadeyev b, Y. Maravin b, I. Volobouev b, J. Ye b bDepartment of Physics, Southern Methodist University, Dallas, TX 75275-0175, USA S. Anderson c, Y. Kubota c, A. Smith c cSchool of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455-0112, USA Abstract We describe the design, construction and performance of a Ring Imaging Cherenkov Detector (RICH) constructed to identify charged particles in the CLEO experiment. Cherenkov radiation occurs in LiF crystals, both planar and ones with a novel “sawtooth”-shaped exit surface. Photons in the wavelength interval 135–165 nm are detected using multi-wire chambers filled with a mixture of methane gas and triethylamine vapor. Excellent π/K separation is demonstrated. arXiv:physics/0506132v2 [physics.ins-det] 26 Jul 2005 Key words: Cherenkov, Particle-identification PACS: 03.30+p, 07.85YK ∗ Corresponding author. Email address: [email protected] (S. Stone). Preprint submitted to Elsevier Science 15 August 2018 1 INTRODUCTION The CLEO II detector was revolutionary in that it was the first to couple a large magnetic tracking volume with a precision crystal electromagnetic calorimeter capable of measuring photons down to the tens of MeV level [1].
    [Show full text]
  • Recent Cleo Results on Hadron Spectroscopy∗
    Vol. 36 (2005) ACTA PHYSICA POLONICA B No 7 RECENT CLEO RESULTS ON HADRON SPECTROSCOPY∗ Tomasz Skwarnicki Department of Physics, 201 Physics Building, Syracuse University Syracuse, NY 13244, USA (Received May 18, 2005) Selected CLEO results on hadron spectroscopy are reviewed. PACS numbers: 14.40.Gx, 13.20.Gd, 13.25.Ft 1. Introduction The CLEO experiment at CESR has been in operation for over a quarter of century. Most of its past running was performed at the Υ(4S) for B meson physics, with smaller amount of data taken at the narrow Υ(1S, 2S, 3S) resonances and at the Υ(5S). With advent of two-ring B-factories at KEK and SLAC, single-ring CESR could not keep up with luminosity. CESR instantaneous peak luminosity at the Υ(4S) is 1.2×1033 cm−2s−1 compared to a KEK-B (PEP-II) record of 1.5 (0.9) × 1034 cm−2s−1. Therefore, the B-physics runs ended in mid 2001. Longer runs at the narrow Υ resonances followed, increasing the data sizes available for these resonances by an order of magnitude; 29 × 106, 9 × 106 and 6 × 106 resonant decays were recorded for Υ(1S), Υ(2S) and Υ(3S), respectively. Some data were also taken at the Υ(5S) (and above) for exploration of Bs (Λb) production rates. Then, CESR was reconfigured by insertion of additional wiggler magnets to operate at lower beam energies in the charm threshold region. Initial test runs with one new wiggler, performed in fall 2002, provided useful ψ(2S) data.
    [Show full text]
  • Arxiv:1610.02629V2 [Hep-Ph] 7 May 2018
    Three Lectures of Flavor and CP violation within and Beyond the Standard Model S. Gori Department of Physics, University of Cincinnati, Cincinnati, Ohio, USA Abstract In these lectures I discuss 1) flavor physics within the Standard Model, 2) effective field theories and Minimal Flavor Violation, 3) flavor physics in the- ories beyond the Standard Model and “high energy" flavor transitions of the top quark and of the Higgs boson. As a bi-product, I present the most updated + − constraints from the measurements of Bs ! µ µ , as well as the most recent development in the LHC searches for top flavor changing couplings. Keywords Lectures; heavy flavor; CP violation; flavor changing couplings. 1 Introduction My plan for these lectures is to introduce you to the basics of flavor physics and CP violation. These three lectures that I gave at the 2015 European School of High-Energy Physics are not comprehensive, but should serve to give an overview of the interesting open questions in flavor physics and of the huge experimental program measuring flavor and CP violating transitions. Hopefully they will spark your curiosity to learn more about flavor physics. There are many books and reviews about flavor physics for those of you interested [1–6]. Flavor physics is the study of different generations, or “flavors", of quarks and leptons, their spectrum and their transitions. There are six different types of quarks: up (u), down (d), strange (s), charm (c), bottom (b) and top (t) and three different type of charged leptons: electron, muon and tau. In these lectures, I will concentrate on the discussion of quarks and the mesons that contain them.
    [Show full text]
  • Study of the Glueball Candidate Fj(2220) at CLEO
    PROCEEDINGS SUPPLEMENTS ELSEVIER Nuclear Physics B (Proc. Suppl.) 82 (2000) 33%343 www.dsevier.ni/locate/npe Study of the glueball candidate fJ(2220) at CLEO Hans P. Paar a aPhysics Department 0319, University of California San Diego, 9500 Gilman Drive, La Jolla CA 92093-0319. (e-mail address: [email protected]) The CLEO detector at the Cornell e+e - storage ring CESR was used to search for the two-photon production of the glueball candidate fJ(2220) in its decay to K~K~ and 7r+Tr-. I present restrictive upper limits on the product of the two-photon width and the respective branching fraction [F77BK~K~]fj(2220 ) < 1.3 eV, 95% CL and [FT~BTr+Tr-]fj(2220) < 2.beV, 95% CL. When these two limits are combined to calculate a lower limit on the Stickiness, a measure of the two-gluon coupling relative to the two-photon coupling, a lower limit SFJ(2220) > 102, 95% CL is found. A new measure of this ratio of couplings is the Gluiness; a combined lower limit of Gfj(2220) > 66, 95% CL is found. These limits on the Stickiness and the Gluiness indicate that the fJ(2220) is likely to have substantial neutral patton or glueball content. 1. INTRODUCTION while spin 0 is unlikely [7]. QCD predicts (using lattice calculations) that a tensor glueball exists The unequivocal demonstration that glueballs and that it should have a mass near 2.2 GeV [8]. exist would prove the existence of a new form A pure glueball will couple to photons only of matter.
    [Show full text]
  • Construction, Pattern Recognition and Performance of the CLEO III Lif-TEA RICH Detector M
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by CERN Document Server 1 Construction, Pattern Recognition and Performance of the CLEO III LiF-TEA RICH Detector M. Artuso, R. Ayad, K. Bukin, A. Efimov, C. Boulahouache, E. Dambasuren, S. Kopp, R. Mountain, G. Majumder, S. Schuh, T. Skwarnicki, S. Stone, G. Viehhauser, J. C. Wang, and a T. E. Coan, V. Fadeyev, Y. Maravin, I. Volobouev, J. Ye, and b S. Anderson, Y. Kubota, and A. Smith c aSyracuse University, Syracuse, NY 13244-1130, U. S. A. bSouthern Methodist University, Dallas, TX 75275-0175 cUniversity of Minnesota, Minneapolis, MN 55455-0112 We briefly describe the design, construction and performance of the LiF-Tea RICH detector built to identify charged particles in the CLEO III experiment. Excellent π/K separation is demonstrated. 1. INTRODUCTION 2. DETECTOR DESCRIPTION 1.1. The CLEO III Detector 2.1. Detector Elements The CLEO III detector was designed to study decays of b and c quarks, τ leptons and Υ mesons G10 Box Rib + Photon Detector produced in e e− collisions near 10 GeV center- Charged of-mass energy. The new detector is an upgraded Particle 20 µm wires CH 4 +TEA Fiberglass 16 cm Cherenkov Pure N Siderail version of CLEO II [1]. It contains a new four- 2 Photon CaF Window 2 layer silicon strip vertex detector, a new wire LiF Radiator 192 mm drift chamber and a particle identification sys- tem based on the detection of Cherenkov ring images. Information about CLEO III is available Photon elsewhere [2,3].
    [Show full text]
  • 35. Particle Detectors at Accelerators
    1 35. Particle Detectors at Accelerators 35. Particle Detectors at Accelerators Revised 2019. See the various sections for authors. 35.1 Introduction ....................................... 2 35.2 Photon detectors..................................... 3 35.2.1 Vacuum photodetectors .............................. 4 35.2.2 Gaseous photon detectors............................. 6 35.2.3 Solid-state photon detectors............................ 7 35.3 Organic scintillators................................... 8 35.3.1 Scintillation mechanism.............................. 9 35.3.2 Caveats and cautions................................ 10 35.3.3 Scintillating and wavelength-shifting fibers.................... 11 35.4 Inorganic scintillators .................................. 11 35.5 Cherenkov detectors................................... 16 35.6 Gaseous detectors .................................... 21 35.6.1 Energy loss and charge transport in gases.................... 21 35.6.2 Multi-Wire Proportional and Drift Chambers.................. 27 35.6.3 High Rate Effects.................................. 29 35.6.4 Micro-Pattern Gas Detectors ........................... 30 35.6.5 Time-projection chambers............................. 34 35.6.6 Transition radiation detectors (TRD’s)...................... 39 35.6.7 Resistive-plate chambers.............................. 42 35.7 Semiconductor detectors................................. 45 35.7.1 Materials Requirements .............................. 45 35.7.2 Detector Configurations.............................. 46
    [Show full text]