1 Institute of High Energy Institute of High Energy Physics Physics Chinese Academy of Sciences Chinese Academy of Sciences Particle Physics Particle Physics Research in Research in Institute of High Institute of High Energy Physics Energy Physics 陈陈陈 (Hesheng Che n)
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Institute of High Energy Physics Chinese Academy of Sciences
Institute of High Energy Physics Chinese Academy of Sciences. Particle Physics Research in Institute of High Energy Physics. 陈和生 ( Hesheng Chen). Institute of High Energy Physics. Comprehensive and largest fundamental research center in China For : High energy physics - PowerPoint PPT Presentation
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Institute of High Energy PhysicsInstitute of High Energy PhysicsChinese Academy of SciencesChinese Academy of Sciences
Particle Physics Research inParticle Physics Research in
Institute of High Energy PhysicsInstitute of High Energy Physics
陈和生 (Hesheng Chen)
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Institute of High Energy Institute of High Energy PhysicsPhysics
Comprehensive and largest fundamental research Comprehensive and largest fundamental research center in China center in China
For :For :– High energy physicsHigh energy physics
– Accelerator technologies and applications Accelerator technologies and applications
– Synchrotron radiation technologies and Synchrotron radiation technologies and applicationsapplications
1000 employees, ~ 650 physicists and engineers1000 employees, ~ 650 physicists and engineers
Beijing Electron Positron Collider: beam energy 1 – 2.8 GeV
Physics Run : Luminosity 1031cm-2s-1 @ 1.89GeV, 5 month/yearSynchrotron Radiation Run : 140mA @ 2.2 GeV, 3 month/year
VC: xy = 100 m TOF: T = 180 ps counter: r= 3 cm MDC: xy = 250 m BSC: E/E= 22 % z = 5.5 cm dE/dx= 8.4 % = 7.9 mr B field: 0.4 T p/p=1.8(1+p2) z = 2.3 cm Dead time/event: 〈 10 ms
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韩国 (3)
Korea University Seoul National University Chonbuk National Univ.
日本 (5)
Univ. of Tokyo
Nikow UniversityTokyo Inst. of Technology
Miyazaki UniversityKEK
美国 (4)
University of HawaiiUniversity of Texas at DallasColorado State University
Stanford Linear Accelerator Center
英国 (1)Queen Mary University
中国 (15)中科院高能所中国科技大学
山东大学 , 浙江大学华中师范大学
上海交通大学 北京大学 , 高等科技中心 武汉大学 ., 南开大学 .
河南师范大学湖南大学 , 辽宁大学 . 清华大学 , 四川大学
北京谱仪国际合作组
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BES has the world largest J/BES has the world largest J/ and and samplessamplesplus: 2-5 GeV R scan, plus: 2-5 GeV R scan, threshold, 8 pb threshold, 8 pb-1-1 ““,, 22.3pb 22.3pb-1-1 Ds … Ds …
J/ 106
106
0
10
20
30
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MarkIII DM2 BESI BESII0
2
4
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MARKI MarkII CrystalBall
BESI BES II
01.11-02.399.11-01.3
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Main Physics Results from BESBES
Precision measurement of mass .
Systematic study of decays: new VT decay suppressed modes and First measurement of B((2S)+-).
measurement of fDs from pure leptonic decay of
Ds.
Measure Br(DS ) in a model independent wa
y. > 120 entries in PDG from BES.
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Precision measurement ofPrecision measurement of mass (1992)
1776.9 – 0.19 – 0.16 MeV+0.18+0.20
• World average value
changed by 3
• Accuracy improved by a
factor of 10
• lepton universality
together with
measurements of lifetime
& leptonic decay Branch
ratios.
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R/R(%)
Before BES 15-20
BES 6.6
BESII BESII New Results R Measurement at 2-5GeV R Measurement at 2-5GeV (91 points)(91 points)
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Impact of BES’s New R Values on the Impact of BES’s New R Values on the SM FitSM Fit for for α (Mα (Mzz
22) and Higgs mass) and Higgs mass
090.0890.128)( 12 ZM
046.0936.128)( 12 ZM
1995 1995 beforebefore BES R dataBES R data
2001 2001 withwith BES R dataBES R data
g-2 experiment
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Final fit
M=1859 MeV/c2
< 30 MeV/c2 (90% CL)
J/pp
M(pp)-2mp (GeV)
0 0.1 0.2 0.3
3-body phase spaceacceptance
2/dof=56/56
fitted peak location
acceptance weighted BW +3 +5
10 25
Threshold enhancement of J/Ψ→ γ p pbar, BW fit →narrow resonance below 2mp
pp/J
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Other Major research fields in Other Major research fields in IHEPIHEP
• L3 Cosmic ray measurementL3 Cosmic ray measurement• Yangbajing - Argo RPC carpet projectYangbajing - Argo RPC carpet project• Hard X ray modulated telescopeHard X ray modulated telescope• Alpha Magnetic SpectrometerAlpha Magnetic Spectrometer• ray burst detector.ray burst detector.
– Intl. collaboration of HEP experimentsIntl. collaboration of HEP experiments• CMS and Atlas at LHCCMS and Atlas at LHC• Belle and BabarBelle and Babar• KamlandKamland• Kloe Kloe
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Other Major research fields in Other Major research fields in IHEPIHEP
2. Theoretical physics2. Theoretical physics
– Particle physics and field theoryParticle physics and field theory– Intermediate and high energy nuclear physicsIntermediate and high energy nuclear physics– Particle-astrophysics and cosmologyParticle-astrophysics and cosmology
3. Accelerator technology3. Accelerator technology– high luminosity e+e- collider: LC R&D– high power proton accelerator
• Chinese Spallation Neutron Source
• Accelerator Driven Subcritical System
– application of low energy accelerators
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4. Radiation technique and application4. Radiation technique and application– Synchrotron radiation – Free electron laser– Nuclear analysis techniques and its applications– Radiation protection
5. Nuclear detector and electronics5. Nuclear detector and electronics
Other Major research fields Other Major research fields in IHEP in IHEP
AMS01 magnet: First magnetic spectrometer in Space built and Space qualified in Beijing
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Prototype of E.M. Calorimeter of AMS02 built by IHEP, b
eam test@CERN, Space qualification tests @Beijing
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爆探测器搭载神舟二号飞船爆探测器搭载神舟二号飞船2001.1.14 - 6.25
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Scientific Scientific BalloonBalloon• Volume up to 400000mVolume up to 400000m33
• Height 40kmHeight 40km
• Payload: Payload:
• Astrophysics detectorAstrophysics detector
• MicrogravityMicrogravity
• Atmospheric physics Atmospheric physics
• EnvironmentEnvironment
• …… ……
Hard X-ray Modulate Telescope Satellite
Charged particle shielding
Collimator
Crystals
PMTSupport structure
Comparison between HXMT and INTEGRAL
Angular Resolution 2’ 15’Source Location 0.2’ 2’Sensitivity (10^-7 / cm^2 S keV) 3 10Observation Mode survey yes no local imaging yes yes pointing yes no
HXMT INTEGRAL
VLBL Experiment of J-PARC to Beijing
• V LBL experiment with 2000 - 4000 km is very interesting to study many important physics:– Sign of the difference of mass square– τappearance – CP violation of
• V LBL experiment from JHF to Beijing– Good tunnel: 20 km north of Beijing, near highway
to Great Wall – The tunnel is 560 m long, 34 meter wide, 13 meter
height , 150 m rock on top– Good infrastructure available– 2200 km to JHF with 9.5o dip angle
Considering new results and successful running of B-faConsidering new results and successful running of B-factories, the physics window remained for the future develoctories, the physics window remained for the future development of BEPC is mainly in the Charm physics:pment of BEPC is mainly in the Charm physics:
1.1.Precision measurement of CKM matrixPrecision measurement of CKM matrix2.2.Search for glueball and quark-gluon hyperid Search for glueball and quark-gluon hyperid 3.3.Light hadron spectroscopyLight hadron spectroscopy4.4. Charmed baryonsCharmed baryons5.5. Rare decay of J/ψRare decay of J/ψ
They are very important for development of QCD: perThey are very important for development of QCD: pertubative and non-pertubative QCD, as well as the intermetubative and non-pertubative QCD, as well as the intermediate region. BEPC has unique advantage for the physics, diate region. BEPC has unique advantage for the physics, which can not be done by B-factories.which can not be done by B-factories.
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• The studies require BEPC mainly running at the threshold region of J / ψ,ψ′andψ , where the production cross sections are very high.
• The best choice is to upgrade machine and detector (BEPCII) with relative less cost within relative short period, to increase luminosity by two orders of magnitude.
Chinese Government approved BEPC II.Construction started
Future development: Future development: BEPCII(2)
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BEPCII: Double Ring DesignBEPCII: Double Ring Design• Build new ring inside existing ring at BEPC tunnel.• Two half new rings and two half old rings cross at two i
nteraction regions, forming a double ring collider. • Horizontal collision with large crossing angle: 11 mrad.• 93 bunch / ring with total current ~ 1A / ring • SC RF cavities • SC micro-beta magnets• Design Luminosity ~ 1033cm-2 s-1 @ 1.89GeV• Dedicated Synchrotron Radiation: 250mA @ 2.5GeV• e+ Injection : 50mA/min. @ 1.55 – 1.89 GeV• Estimated Cost ~ 77M US$
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BEPCII:BEPCII: a high luminosity double–ring collider a high luminosity double–ring collider
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BEPCII: Double Ring DesignBEPCII: Double Ring Design• Build new ring inside existing ring at BEPC tunnel.• Two half new rings and two half old rings cross at two i
nteraction regions, forming a double ring collider. • Horizontal collision with large crossing angle: 11 mrad.• 93 bunch / ring with total current ~ 1A / ring • SC RF cavities • SC micro-beta magnets• Design Luminosity ~ 1033cm-2 s-1 @ 1.89GeV• Dedicated Synchrotron Radiation: 250mA @ 2.5GeV• e+ Injection : 50mA/min. @ 1.55 – 1.89 GeV• Estimated Cost ~ 77M US$
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1029
1030
1031
1032
1033
1034
1035
1036
1037
1 10 100 1000
GLC
ADONE
VEPP2000
KEK B and PEP II
KEK BPEP II
CESR
DAFNE
DAFNE2
BEPCIII
CESRc
Ecm
(GeV)
L (cm-2 sec-1 )
VEPP2M
LEP
TRISTANPETRA
VEPP4MDORIS
SPEARBEPC
COLLIDERS
FACTORIES
SUPER FACTORIES
ee++-e-e-- Colliders: Past, Present and Future Colliders: Past, Present and Future
C. Biscari, Workshop on e+e- in 1-2 GeV Range, September 10-13, 2003, Italy
L (cm-2 s-1)
E (GeV)
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• Adapt to high event rate of BEPCII: 1033cm-2 s-1 and bunch spacing 8ns• Reduce sys. errors to match high statistics photon measurement, PID…• Increase acceptance
MDC: small cell & He gas xy=130 mp/p = 0.5% @1GeV dE/dx=6%
EMCAL: CsI crystalE/E = 2.5% @1GeV z = 0.5 cm/E
TOF: T = 80 ps Barrel 100 ps Endcap
Magnet: - 0.4-0.5 T existing BESII magnet - 1 T Super conducting magnet
Data Acquisition: Event rate = 3KHz Thruput ~ 50 MB/s
BESIII detectorBESIII detector
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Event Statistics: BESIII vs. CLEOc Energy
(GeV)
Luminosity (1033 cm–2s –1)
Events/year (109)
BEPCII CLEO BEPCII CLEO
J/ 3.097 0.6 0.15 10.0 1.0
3.67 1.0 0.30 0.012 —
’ 3.686 1.0 0.30 3.0 —
D 3.77 1.0 0.30 0.025 0.03 *
Ds 4.03 0.6 0.50 0.001 —
Ds 4.14 0.6 0.50 0.002 0.0015
* CLEO took 10 nb D production cross section while we took 5 nb
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BESIII Expected Physics Results
because BEPCII lum. increased by two-orders of magnitude, a factor of 3 – 7 higher than CLEOc , and its beam energy width is about half of CLEOc, BES III can obtain many important results in precision measurements of tau-charm physics• Precise measure CKM parameters: a few %• Precise R measurement : <3%
• Search for glueballs, fit overlap resonance's, and determine spin and parity
• Nov. 04 – March 05: SR running • April 05 – Jan. 06: Long shutdown
– Remove existing ring – Install two rings– Cryogenics system ready for SC devices, field mapping
• Feb.- Sep. 06: Tuning of machine + SR running • Oct. 06 : BESIII detector moved into beam line• Nov. 06 – Feb. 07 : Machine-detector tuning. • Physics run by March 2007
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Middle and Long Term PlanMiddle and Long Term Plan Chinese Government organizes a national wide effort to
make middle and long term plan for Science and technology.
IHEP joins several groups actively, specially for• Particle physics, • Particle Astrophysics• Accelerator technology, • Synchrotron Radiation and applications• big science facility, Taking the advantage of BSRF and other facilities, IHE
P should extent research fields to protein structure, nano-science , material science, follow good examples of BNL, ANL and KEK …
→ Multiple Sciences Research Center
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Possible projects for Middle term Possible projects for Middle term • Charm physics @ BEPCII • Modulated hard X-ray telescope• Neutrino experiemnts:
– Reactor neutrino – Very LBL oscillation experiment: J-Prac→ Beijing
• Spallation Neutron Source • Free Electron Laser• SR and application during BEPCII• Convert BEPC into dedicated SR source after
BEPCII finished physics runningWe are interested to cooperate with US Lab.’s in theseProjects and fields.
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Remarks about Daya Bay Neutrino Exp.Remarks about Daya Bay Neutrino Exp.• IHEP is very interested in the exp..
– Inst. Management support R&D– Many physicists are interested in it , some of them with goo
d experience in the neutrino exp..– Physics committee reviewed the R&D proposal Monday– Visit to site, and asked feasibility study on the tunnels – Great efforts needed to reach sys. errors < 1%.
• Chinese Academy of Sciences: the director of the fundamental research Bureau is interested in it, and understood the strong competition.
• NSFC is interested in it: both the president and a vice president are nuclear physicists. – They support the idea, and suggested us to make proposal – They have inference to Daya Bay power plant for cooperati
on
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Remarks about Daya Bay Neutrino Exp.Remarks about Daya Bay Neutrino Exp.• I mentioned our interest in the experiment at PRC-U
S HEP annual meeting 4-5 Nov. at SLAC. • Both DOE and US Lab.’s (LBL, ANL, BNL) showed
strong interest– LBL tried to convince us to join their exp. with 10M$– LBL and ANL are interest to send physicists to attend this
meeting. How shall we do with the collaboration?
• R&D should be started ASAP. Funding and man powers to be solved.
• More careful study about systematic errors. • Optimize the design• Jan. 04: workshop in Beijing