High Intensity Electron Positron Accelerator (HIEPA) Super Tau Charm Facility （ STCF ） in China Hai-ping Peng penghp@ustc.edu.cn State Key Laboratory of Particle Detection and Electronics (SKLPE) University of Science and Technology of China (USTC) (On behalf HIEPA/STCF Steering Committee) Charm2018, May 21-25, Novosibirsk Russia Charm2018 ， Novosibirsk ， Russia 21/05/2018 H.P. Peng 1
Outline • History of -c facility in China • Proposed Super -c facility in China • Pre-Design consideration of Detector • Highlight physics • Activities • Summary Charm2018 ， Novosibirsk ， Russia 21/05/2018 H.P. Peng 2
30 Years of -c facility in China 10 31 cm -2 s -1 10 33 cm -2 s -1 BEPCI (1988−2005) BEPCII (2006−now) Single Ring Double Ring BESI/II BESIII Charm2018 ， Novosibirsk ， Russia 21/05/2018 H.P. Peng 3
Milestones of BEPCII Jan. 2004 Construction started May. 4, 2004 Dismount of 8 linac sections Linac delivered e - beams to BEPC Dec. 1, 2004 Sep. 2004 May 2004 July 4, 2005 BEPC ring dismount started July 2005 Oct. 2005 Mar. 2, 2006 BEPCII ring installation started Aug. 3, 2007 Shutdown for IR-SCQ installation Mar. 28, 2008 Shutdown for BESIII installation July 19, 2008 First hadron event observed Nov. 2006 Luminosity reached 3.3 10 32 cm -2 s -1 May 19, 2009 Oct. 2006 July 2007 Oct. 2007 July 17, 2009 Pass the National test & check Luminosity reached 6.5 10 32 cm -2 s -1 Peak Lum history April 8, 2011 3.50E+32 April 2013 Zc(3900) found & confirmed 3.00E+32 lum Luminosity reached 8.53 10 32 cm -2 s - 2.50E+32 Nov. 20, 2014 2.00E+32 1 1.50E+32 July 2008 Luminosity reached 10.0 10 32 cm -2 s - May 2008 1.00E+32 April 5, 2016 May 2009 5.00E+31 1 0.00E+00 7 8 9 1 1 1 1 2 3 4 5 - - - 0 1 2 - - - - - 1 1 1 - - - 1 1 1 1 1 >1fb -1 @ 4.23 ~500pb -1 @ 4.26, 4.36 Top-up ~300pb -1 @4.26 2012 – 13 May 2010 Nov. 2015 2010 2011 2013 2014 2016 Charm2018 ， Novosibirsk ， Russia 21/05/2018 H.P. Peng 4
Broad Physics at -c Energy Region R =s(e + e - hadron)/ s(e + e - m + m - ) • Hadron form factors • Light hadron spectroscopy • XYZ particles • Y(2175) resonance • Gluonic and exotic states • Physics with D mesons • Mutltiquark states • Process of LFV and CPV • f D and f Ds with s quark, Zs • Rare and forbidden decays • D 0 -D 0 mixing • MLLA/LPHD and QCD • Physics with lepton • Charm baryons sum rule predictions • Precision QED , a , charm quark mass extraction. R scan • Hadron form factor(nucleon, , p). Blank at 5-7GeV to date Charm2018 ， Novosibirsk ， Russia 5 21/05/2018 H.P. Peng
Fruitful BESIII Results Most precise measurement Z c (3900) Abrupt structure for D leptonic decay X(1835) Large Isospin Violation First c at BESIII (1405) f 0 (980) 0 Precise measurement Precise Measurement on Cross section e e − − 200 publications http://bes3.ihep.ac.cn/pub/physics.htm Charm2018 ， Novosibirsk ， Russia 21/05/2018 H.P. Peng 6
-c facility in China Features and limits of BEPCII/BESIII • Threshold production • limited Ecms range : 2-4.6 GeV Luminosity : 10 33 cm -2 s -1 • Clean Signal, low background • • High efficiency and resolution • No major upgrade proposal to • ………. date BEPCII/BESIII will end her mission in 8-10 years A STCF far beyond BEPCII, is nature extension and a viable option for a post-BEPCII HEP project in China Charm2018 ， Novosibirsk ， Russia 21/05/2018 H.P. Peng 7
STCF in Perspective SKEKB STCF BEPC-II BEPC 2028 35 cm cm -2 s -1 at 4 GeV ity 1 10 A l luminosity 10 35 GeV at t 2028 28 is reas ason onable able !! Charm2018 ， Novosibirsk ， Russia 21/05/2018 H.P. Peng 8
STCF in China Super Tau-Charm Facility (STCF) Peak luminosity 0.5-1 10 35 cm -2 s -1 at 4 GeV Energy range E cm = 2 7GeV Polarization available on electron beam (Phase II) Basic Features of machine : Symmetric machine with dual-ring Large Piwinski angle collision + crabbed waist solution for the IR Siberia snake for polarization Total cost 4B RMB Charm2018 ， Novosibirsk ， Russia 21/05/2018 H.P. Peng 9
Layout of Machine Interaction Region : Large Piwinski Angle Collision + Crabbed Waist Detector Snakes Crab Sextupole Wigglers Injector Linac 0.5- 3.5 GeV Injector: No booster, 0.5GeV 1~3.5GeV • • e+, a convertor, a linac and a damping ring, 0.5GeV • e-, a polarized e- source, accelerated to 0.5GeV Charm2018 ， Novosibirsk ， Russia 21/05/2018 H.P. Peng 10
Parameters of Machine Parameters 1 2 Luminosity : Circumference/m ~600 ~600 𝑀 = γ𝑜 𝑐 𝐽 𝑐 ∗ 𝜊 𝑧 𝐼 Beam Energy/GeV 2 2 2𝑓𝑠 𝑓 𝛾 𝑧 Current/A 1.5 2 • Increase beam current E 𝐧𝐣𝐮𝐮𝐛𝐨𝐝𝐟 𝜁 𝑦 / 5/0.05 5/0.05 • ∗ Minimize β Function 𝛾 𝑧 • Optimize 𝜊 𝑧 and H β Function @ IP 100/0.9 67/0.6 ∗ /mm ∗ /𝛾 𝑧 𝛾 𝑦 Strategy : Collision Angle(full 60 60 θ)/ mrad • (Phase 0) Pilot: 0.5 × 10 35 Tune Shift 𝜊 𝑧 0.06 0.08 • (Phase I) Nominal: 1.0 × 10 35 • (Phase II) Polarized e- Hour-glass Factor 0.8 0.8 • ….. Luminosity/ × 10 35 cm -2 s -1 ~0.5 ~1.0 Charm2018 ， Novosibirsk ， Russia 21/05/2018 H.P. Peng 11
General Consideration of Detector Much larger radiation tolerance, especially at IP and forward regions The detector and electronics should withstand the expected does Efficient event triggering, exclusive state reconstruction and tagging high efficiency and resolutions for charged and neutral particles Low noise and High rate capability The Systematic uncertainty control Detector acceptance : geometrical acceptance or detector response Mis-Measurement : mis-tracking, fake photon, particle mis-id, noise Luminosity measurement Reasonable cost Charm2018 ， Novosibirsk ， Russia 21/05/2018 H.P. Peng 12
Detector Layout 245 MUD cm • / suppression power >10/30 York/Muon EMC 185 York/Muon • Energy range: 0.02-2.5 GeV Superconducting magnet cm E (%) • At 1 GeV (0.7-1 T) Barrel(Cs(I): 2 135 Endcap (Cs): 4 EMC cm PID 105 PID-barrel • /K (and K/p) 3-4 separation cm PID-endcap 85 cm up to 2GeV/c 20 MDC (Low mass ) MDC • xy =130 mm • dE/dx<7%, p /p =0.5% at 1 GeV PXD/SS PXD 15 cm D 10 cm • Material budget ~0.15%X 0 /layer 3~6 • xy =50 mm cm IP cm 120 cm 140 cm 190 cm 240 cm 300 Charm2018 ， Novosibirsk ， Russia 21/05/2018 H.P. Peng 13
̶ ̶ Detector requirements & Baseline • Vertexing : Not very critical But to combine with a central tracker to improve the tracking efficiency for low momentum track and resolution Special design to cope with the large radiation close to IP Technologies options : A Low mass silicon detectors : DEPFET, MAPS … MPGD : Cylindrical GEM/MicroMegas/Urwell Centra ntral tracking king : • large acceptance, low mass, high efficiency and high resolution A low mass drift chamber with smaller cell size and lighter working gas Charm2018 ， Novosibirsk ， Russia 21/05/2018 H.P. Peng 14
Detector requirements & Baseline • PID system : /K separation up to 2GeV, compact (<20cm) and low mass (<0.5X 0 ) ─ ─ Cherenkov-based technology is favorable for high momentum tracks, and dE/dx for the low momentum tracks ─ Technology options : RICH, DIRC-Like Baseline Design : Proximity RICH, similar to ALICE HMPID, but with CsI-coated MPGD readout Alternative Design : Aerogel + Position Sensitive Photon Detector, similar to BELLE-II ARICH iTOP for BELLE2 FTOF for superB ALICE HMPID Charm2018 ， Novosibirsk ， Russia 21/05/2018 H.P. Peng 15
Detector requirements & Baseline e/ measurement : • – High efficiency for low energy – Good energy, position and time resolution – Fast response and Radiation hardened – Technology option : Crystal + novel photon detector (e.g. SiPM) Crystal : pure CsI for barrel, LYSO for Endcap Readout : Larger Area PD, APD and SiPM � Charm2018 ， Novosibirsk ， Russia 21/05/2018 H.P. Peng 16
Detector requirements & Baseline • μ detection – Low momentum threshold (p~0.4GeV) – high μ efficiency and μ/ suppression power>10 (30 ） – Technology option ： 2-3 inner layers with MRPC for precise timing ~8 outer layers with RPC (Barrel : streamer, Endcap : avalanche) Long-Strip MRPC Module at STAR • Active area: 87 x 52 cm 2 • Read out strip: 87 cm x 3.8 cm • Gas gaps: 0.25 mm x 5 MTD at STAR Performance: • Efficiency: > 98% • Time resolution: < 80 ps • Spatial resolution: 0.6 cm • Magnet – Desirable to be adjustable from 0.5-1.0 T Charm2018 ， Novosibirsk ， Russia 21/05/2018 H.P. Peng 17
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