00 Cooler CSB Observation of dd  απ 0 CSB–VII Trento, Italy June 13-17, 2005 Ed Stephenson Indiana University Cyclotron Facility Review of the experiment.

Slides:



Advertisements
Similar presentations
HARP Anselmo Cervera Villanueva University of Geneva (Switzerland) K2K Neutrino CH Meeting Neuchâtel, June 21-22, 2004.
Advertisements

Design and First Results of a Cosmic Ray Telescope For Use In Testing a Focusing DIRC M. P. Belhorn University of Cincinnati The BELLE group at the University.
July 2001 Snowmass A New Measurement of  from KTeV Introduction The KTeV Detector  Analysis of 1997 Data Update of Previous Result Conclusions.
Recent Electroweak Results from the Tevatron Weak Interactions and Neutrinos Workshop Delphi, Greece, 6-11 June, 2005 Dhiman Chakraborty Northern Illinois.
Study of two pion channel from photoproduction on the deuteron Lewis Graham Proposal Phys 745 Class May 6, 2009.
Zhihong Ye Hampton University Feb. 16 th 2010, APS Meeting, Washington DC Data Analysis Strategy to Obtain High Precision Missing Mass Spectra For E
The Transverse detector is made of an array of 256 scintillating fibers coupled to Avalanche PhotoDiodes (APD). The small size of the fibers (5X5mm) results.
The PEPPo e - & e + polarization measurements E. Fanchini On behalf of the PEPPo collaboration POSIPOL 2012 Zeuthen 4-6 September E. Fanchini -Posipol.
DIS 2006 TSUKUBA April 21, 2006 Alessandro Bravar Spin Dependence in Polarized Elastic Scattering in the CNI Region A. Bravar, I. Alekseev, G. Bunce, S.
Report of the NTPC Test Experiment in 2007Sep and Others Yohei Nakatsugawa.
T.C. Jude D.I. Glazier, D.P. Watts The University of Edinburgh Strangeness Photoproduction At Threshold Energies.
Lecture 14: Two Key Experiments 21/10/2003 News flash from Indiana University: Tour-de-force experiment:
Crossed Channel Compton Scattering Michael Düren and George Serbanut, II. Phys. Institut, - some remarks on cross sections and background processes  
Feb 10, 2005 S. Kahn -- Pid Detectors in G4MicePage 1 Pid Detector Implementation in G4Mice Steve Kahn Brookhaven National Lab 10 Feb 2005.
Jin Huang M.I.T. Hall A Analysis Workshop Dec 14, JLab.
STUDY OF CHARMONIUM STATES IN ANTIPROTON-PROTON ANNIHILATIONS: RESULTS FROM FERMILAB E-835 Giulio Stancari Fermi National Accelerator Laboratory for the.
Rosen07 Two-Photon Exchange Status Update James Johnson Northwestern University & Argonne National Lab For the Rosen07 Collaboration.
1 Polarimeter for dEDM experiment G. Venanzoni Laboratori Nazionali di Frascati for the dEDM collaboration Workshop on Flavour in the era of LHC – Cern.
Deuteron Polarimeter for Electric Dipole Moment Search Ed Stephenson Indiana University Cyclotron Facility DIPOLES: μ·B + ־ reverse time + ־ d·Ed·E commonplace.
LOGO The η -mass measurement with the Crystal Ball at MAMI A. Nikolaev for the Crystal MAMI and A2 Collaborations Helmholtz Institut für Strahlen-
Exclusive π 0 electroproduction in the resonance region. Nikolay Markov, Maurizio Ungaro, Kyungseon Joo University of Connecticut Hadron spectroscopy meeting.
V.L. Kashevarov. Crystal Collaboration Meeting, Mainz, September 2008 Photoproduction of    on protons ► Introduction ► Data analysis.
 Motivation for the Heavy Photon (A’)  A’ Production and kinematics  HPS Experimental Setup  Simulation and Analysis Software.
Start Counter Collaboration Meeting September 2004 W. Boeglin FIU.
Yury Gurchin June 2011 MEASUREMENT OF THE CROSS-SECTION IN DP-ELASTIC SCATTERING AT THE ENERGIES OF 500 AND 880 MEV AT NUCLOTRON.
A search for deeply-bound kaonic nuclear states in (in-flight K -, N) reaction Hiroaki Ohnishi RIKEN.
» Absolute Polarimetry of Proton Beams at RHIC« Oleg Eyser for the RHIC Polarimetry Group International Workshop on Polarized Sources, Targets and Polarimetry.
BigCal Reconstruction and Elastic Event Selection for GEp-III Andrew Puckett, MIT on behalf of the GEp-III Collaboration.
BES-III Workshop Oct.2001,Beijing The BESIII Luminosity Monitor High Energy Physics Group Dept. of Modern Physics,USTC P.O.Box 4 Hefei,
Experimental Nuclear Physics Some Recent Activities 1.Development of a detector for low-energy neutrons a. Hardware -- A Novel Design Idea b. Measure the.
W Mass and Width at LEP2 Jeremy Nowell ALEPH / Imperial College London On behalf of the LEP collaborations.
Lecture 9: Inelastic Scattering and Excited States 2/10/2003 Inelastic scattering refers to the process in which energy is transferred to the target,
Experimental Search for the Decay K. Mizouchi (Kyoto University) (1) Physics Motivation (2) Detector (3) Selection Criteria (4) Branching Ratio (5) Background.
A. Zelenski a, G. Atoian a *, A. Bogdanov b, D.Raparia a, M.Runtso b, D. Steski a, V. Zajic a a Brookhaven National Laboratory, Upton, NY, 11973, USA b.
Lukens - 1 Fermilab Seminar – July, 2011 Observation of the  b 0 Patrick T. Lukens Fermilab for the CDF Collaboration July 2011.
A First Analysis of the 3 He Test Beamtime CB Meeting Mainz, March 9, 2010 Patricia Aguar Bartolomé Alexander Mushkarenkov.
Magnetized hadronic calorimeter and muon veto for the K +   +  experiment L. DiLella, May 25, 2004 Purpose:  Provide pion – muon separation (muon veto)
Muon detection in NA60  Experiment setup and operation principle  Coping with background R.Shahoyan, IST (Lisbon)
00 Cooler CSB Direct or Extra Photons in d+d  0 Andrew Bacher for the CSB Cooler Collaboration ECT Trento, June 2005.
J-PARC でのハイパー核ガンマ線分光実験用 散乱粒子磁気スペクトロメータ検出器の準備 状況 東北大理, 岐阜大教 A, KEK B 白鳥昂太郎, 田村裕和, 鵜養美冬 A, 石元茂 B, 大谷友和, 小池武志, 佐藤美沙子, 千賀信幸, 細見健二, 馬越, 三輪浩司, 山本剛史, 他 Hyperball-J.
Jan. 18, 2008 Hall C Meeting L. Yuan/Hampton U.. Outline HKS experimental goals HKS experimental setup Issues on spectrometer system calibration Calibration.
L/T separation in the 3 He(e,e’p) reaction at parallel kinematics Freija Descamps Supervisors: Ron Gilman Eric Voutier Co-supervisor: Jean Mougey.
1 Absolute Hadronic D 0 and D + Branching Fractions at CLEO-c Werner Sun, Cornell University for the CLEO-c Collaboration Particles and Nuclei International.
T2K Status Report. The Accelerator Complex a Beamline Performance 3 First T2K run completed January to June x protons accumulated.
Susan Burke DØ/University of Arizona DPF 2006 Measurement of the top pair production cross section at DØ using dilepton and lepton + track events Susan.
 0 life time analysis updates, preliminary results from Primex experiment 08/13/2007 I.Larin, Hall-B meeting.
Thomas Roser Snowmass 2001 June 30 - July 21, 2001 Proton Polarimetry Proton polarimeter reactions RHIC polarimeters.
Simultaneous photo-production measurement of the  and  mesons on the nucleons at the range 680 – 1500 MeV N.Rudnev, V.Nedorezov, A.Turinge for the GRAAL.
Deuteron polarimetry from 1.0 to 1.5 GeV/c Ed Stephenson, IUCF EDM discussion April 14, 2006 Based on work from: France:POMME B. Bonin et al. Nucl. Inst.
The “New” Charge Symmetry precision experiments in few nucleon systems from meson-exchange to effective field theory Ed Stephenson Indiana University Cyclotron.
15 cm Plots of missing mass spectrum and 90% interval for width of 0.5 and 10 MeV. Color lines show upper limit, lower limit and sensitivity. Search for.
P.F.Ermolov SVD-2 status and experimental program VHMP 16 April 2005 SVD-2 status and experimental program 1.SVD history 2.SVD-2 setup 3.Experiment characteristics.
A New Upper Limit for the Tau-Neutrino Magnetic Moment Reinhard Schwienhorst      ee ee
Seoul National University Han-wool Ju CUNPA Kick-off Meeting Aug.22-23, 2013.
Exploring the alpha cluster structure of nuclei using the thick target inverse kinematics technique for multiple alpha decays. Marina Barbui June, 23 rd,
Analysis of    production ► Data taking ► Reaction identification ► Results for double polarization observable F ► Summary Based on data taken in the.
HADRON 2009, FloridaAnar Rustamov, GSI Darmstadt, Germany 1 Inclusive meson production at 3.5 GeV pp collisions with the HADES spectrometer Anar Rustamov.
TOF detector in PHENIX experiment PHENIX time-of-flight counter The PHENIX time-of-flight (TOF) counter serves as a particle identification device for.
Open and Hidden Beauty Production in 920 GeV p-N interactions Presented by Mauro Villa for the Hera-B collaboration 2002/3 data taking:
Cross section of the process
Searching for states analogous to the 12C Hoyle state in heavier nuclei using the thick target inverse kinematics technique. Marina Barbui 5/17/2018, Galveston,
p0 life time analysis: general method, updates and preliminary result
° status report analysis details: overview; “where we are”; plans: before finalizing result.. I.Larin 02/13/2009.
A Precision Measurement of GEp/GMp with BLAST
Today’s topics; New AN and ANN results at s = 6.9 GeV
NKS2 Meeting with Bydzovsky NKS2 Experiment / Analysis Status
Susan Burke, University of Arizona
COMPTON SCATTERING IN FORWARD DIRECTION
° status report analysis details: overview; “where we are”; plans: before finalizing result.. I.Larin 02/13/2009.
Status of the cross section analysis in e! e
Presentation transcript:

00 Cooler CSB Observation of dd  απ 0 CSB–VII Trento, Italy June 13-17, 2005 Ed Stephenson Indiana University Cyclotron Facility Review of the experiment

Getting d + d → 4 He + π 0 right Ed Stephenson Indiana University Cyclotron Facility Bloomington, IN Workshop on Charge Symmetry Breaking Trento June 13-17, 2005 Before you start, remember the history… suggested by Lapidus [JETP 4, 740 (’57)] review by Banaigs [PRL 58, 1922 (’87)] upper limit at 0.8 GeV positive claim by Goldzahl [NP A 533, 675 (’91)] double radiative capture by Dobrokhotov [PRL 83, 5246 (’99)} Be prepared for… very low cross sections ( ~ pb) interference from double radiative capture

PLAN Search just above threshold (225.5 MeV) (No other π channel open for d+d.) Capture forward-going 4 He. Pb-glass arrays for π 0  γγ. Efficiency on two sides ~ 1/3. Insensitive to other products (γ beam = 0.51) 6  bend in Cooler straight section Target upstream, surrounded by Pb-glass Magnetic channel to catch 4 He (~100 MeV) Reconstruct kinematics from channel time of flight and position. (Pb-glass energy and angle too uncertain for π 0 reconstruction. αγγ looks the same.) Target density = 3.1 x Stored current = 1.4 mA Luminosity = 2.7 x /cm 2 /s Expected rate ~ 5 /day … thanks to Andy Bacher, Mark Pickar, and Georg Berg Crucial features: Pb-glass has low backgroud Windowless target Channel with good TOF

Target D 2 jet Pb-glass array 256 detectors from IUCF and ANL (Spinka) + scintillators for cosmic trigger or MeV deuteron beam Separation Magnet removes 4 He at 12.5  from beam at 6  20  Septum Magnet Focussing Quads MWPCs Scintillator  E-1 Scintillators  E-2 E Veto-1 Veto-2 MWPC COOLER-CSB MAGNETIC CHANNEL and Pb-GLASS ARRAYS separate all 4 He for total cross section measurement determine 4 He 4-momentum (using TOF and position) detect one or both decay  ’s from  0 in Pb-glass array Actual Pb-glass arrangement

SEPARATION OF  0 AND  EVENTS MWPC 1 X-position (cm) Y-position (cm) Time of Flight (ΔE 1 - ΔE 2 ) (ns) needed TOF resolution  GAUSS = 100 ps MWPC spacing = 2 mm Calculate missing mass from the four- momentum measured in the magnetic channel alone, using TOF for z-axis momentum and MWPC X and Y for transverse momentum. [Monte Carlo simulation for illustration. Experimental errors included.]  0 peak  TOT = 10 pb  background (16 pb)  prediction from Gårdestig Difference is due to acceptance of channel. Acceptance widths are: angle = 70 mr (H and V) momentum = 10% missing mass (MeV) Cutoff controlled by available energy above threshold.. Major physics background is from double radiative capture.

COMMISSIONING THE SYSTEM using p+d  3 He+π 0 at MeV 3 He events readily identified by channel scintillators. Recoil cone on first MWPC Channel time of flight Construction of missing mass from TOF and position on MWPC. FWHM = 240 keV Pb-glass energy sums nearest neighbors. Response matched to GEANT model. Efficiency (~ 1/3) known to 3%. data Monte- Carlo NOTE: Main losses in channel from random veto, multiple scattering, and MWPC multiple hits. It is important to identify loss mechanisms.

IDENTIFICATION OF 4 He IN THE CHANNEL  E2 E  E1-C  E2 [online spectra for 5-hour run] We absolutely need coincidence with the Pb-glass (decay  ) to extract any signal at all. Proton rate from breakup ~ 10 5 /s. Handle this with: veto longer range protons set timing to miss most protons reduce MWPC voltage to keep Z=1 tracks below threshold divide ΔE-1 into four quadrants Set windows around 4 He group. Rate still 10 3 too high. The 4 He flux, most likely from (d,α) reactions, is smooth in momentum and angle. It represents the part of phase space sampled by the channel.

SINGLE AND DOUBLE GAMMA SIGNALS data for all of July run corrected  time  cluster energy A single  may be difficult to extract. But select on the similar locus on the other side of the beam, and the signal becomes clean. Beam left-side array Many  ’s come from beam halo hitting downstream septum. List of requirements: > correct PID position in channel scintillator energy > correct range of TOF values > correct Pb-glass cluster energies and corrected times We will require two  ’s. keep above here

RF frequency (MHz) Cooler circumference (m) average circumference = ± m 3 He cone opening angle (deg) OTHER ITEMS Stuff you have to get right! Energy of Cooler beam known from ring circumference and RF frequency (~ 16 keV) Calculation of He momentum depends on good model of energy loss in channel. This is also needed to set channel magnets. Calculation of time of flight required knowing the time offsets for each scintillator PMT and tracking changes through the experiment. Final adjustments were made in replay. Run plan: started in June at MeV to keep cone in channel during 1-week break decided to raise energy to MeV demonstrate that peak stayed at pion mass provide two cross sections to check energy dependence (Limits were luminosity, rate handling, available time.)

Time Stability Problem For good resolution, we need FWHM ~ 0.2 ns. PMT signal transit time drifts and occasionally jumps as the tube ages, responding to heat. Timing is affected when people change PMT voltage or swap other equipment. This is also connected to missing mass reconstruction errors arising from 6° magnet dispersion, pulse height, and position effects. A narrow peak helps  0 separation statistically.  E1  E2 A B C D There are 6 PMTs used for TOF. Mean-timing the ones for  E2 leaves 4 free time parameters.

To make run-by-run corrections to TOF, we need a marker. We use deuterons that stop and the back of the E scintillator. Choose EnergyChoose Trajectory deuteron gate p d  E2 E XY-1 XY-2 XY-3 Resulting TOF peaks  E1 scintillator: A B C D

Results for June run: 1 ns

beam 44° 25° deuteron telescope (present only for calibration) tapered/displaced scintillator pair for added position info. Calibrating the luminosity of the IUCF Cooler PLAN: Monitor with d+d elastic. Measure ratio of d+d cross section to d+p (known) with molecular HD target. Reference d+p cross sections: thesis of Karsten Ermisch, KVI, Groningen (‘03). dot = 108 MeV circle = 120 MeV X = 135 MeV line = adopted cross section at 116 MeV NOTE: Target distribution monitored using position sensitive silicon detector looking at recoil deuterons from small-angle scattering. Detector acceptance determined using Monte-Carlo simulations. dσ/dΩ (mb/sr) θ c.m.

Recent measurements by the Japanese confirm their old cross section values at 135 MeV and disagree with the data from the KVI. KVI data Japanese data original d-beam data from RIKEN remeasurements from RIKEN and RCNP. An independent measurement is needed !

beam target position-sensitive silicon detector ½-inch copper absorbers delta- E E silicon position E energy Forward scintillator – silicon system distinguish H from D by pulse height in silicon H D Issues include reaction losses and multiple scattering. Position becomes template for target distribution.

beam Detail on second luminosity monitoring system oppositely tapered scintillators for X-position two halves displaced vertically to check vertical centering results not satisfactory, relied on transit alignment

protons deuterons position span Scintillator spectra: (44 ° – 44 ° coincidence) 44 ° scintillator, back vs. front pulse height (zero suppressed to remove no-hits) F – B F + B x = angle beam z-position anglebeam z-position cut left right x L by x R gated on deuterons

average η = p π /m π σ TOT /η RESULTS MeV 50 events σ TOT = 15.1 ± 3.1 pb MeV 66 events σ TOT = 12.7 ± 2.2 pb missing mass (MeV) Events in these spectra must satisfy: correct pulse height in channel scintillators usable wire chamber signals good Pb-glass pulse height and timing Background shape based on calculated double radiative capture, corrected by empirical channel acceptance using 4 He. Cross sections are consistent with S-wave pion production. Spectra are essentially free of random background. Systematic errors are 6.6% in normalization. Peaks give the correct π 0 mass with 60 keV error.

XY-1 position T = MeV,  max = 1.20°T = MeV,  max = 1.75° EXISTENCE? For the candidate events, check to see whether there is any cone.

XY-1 position T = MeV,  max = 1.20°T = MeV,  max = 1.75° EXISTENCE? For the candidate events, check to see whether there is any cone. Circles with these centers also minimize the missing mass width.

missing mass (MeV  100) raw TOF 135 MeV IS IT CORRECT? The missing mass should be independent of the TOF. In fact, the time adjustments are made separately for each segment of  E1. AB CD T = MeVT = MeV

V. Anferov, G.P.A. Berg, and C.C. Foster, Indiana University Cyclotron Facility, Bloomington, IN B. Chujko, A. Kuznetsov, V. Medvedev, D. Patalahka, A. Prudkoglyad, and P.A. Semenov, Institute for High Energy Physics, Protvino, Moscow Region, Russia S. Shastry, State University of New York, Plattsburgh, NY spokesperson for CE-82 and letter of intent post-doc technical manager student Experimental (active): C. Allgower, A.D. Bacher, C. Lavelle, H. Nann, J. Olmsted, T. Rinckel, and E.J. Stephenson, Indiana University Cyclotron Facility, Bloomington, IN M.A. Pickar, Minnesota State University at Mankato, Mankato, MN P.V. Pancella, Western Michigan University, Kalamazoo, MI A. Smith, Hillsdale College, Hillsdale, MI H.M. Spinka, Argonne National Laboratory, Argonne, IL J. Rapaport, Ohio University, Athens, OH Technical support: J. Doskow, G. East, W. Fox, D. Friesel, R.E. Pollock, T. Sloan, and K. Solberg, Indiana University Cyclotron Facility, Bloomington, IN Experiment (historical): Underline did June/July shift work Theoretical: Antonio Fonseca, Lisbon Anders Gardestig, Indiana Christoph Hanhart, Juelich Chuck Horowitz, Indiana Jerry Miller, Washington Fred Myhrer, South Carolina Jouni Niskanen, Helsinki Andreas Nogga, Arizona Bira van Kolck, Arizona