Status and results of Novosibirsk accelerator complex Budker Institute of Nuclear Physics Status and results of Novosibirsk accelerator complex Pavel Logachev, ICPPA’17

Particle Physics at Budker INP A few generations of the colliders and detectors Collider 2E, Gev Detectors Operation VEP-1 (e-e-) 0.32 2 detectors 1965-67 VEPP-2 1.4 3 detectors 1967-72 VEPP-3 2.0 2 detectors 1972- (booster and Nucl. Phys) VEPP-4 11.0 OLYA, MD-1 1980-85 VEPP-2M 1.4 OLYA, TOF,ND 1974-2000 CMD, SND, CMD-2 VEPP-4M 11.0 KEDR 2000- VEPP-2000 2.0 SND, CMD-3 2009 Tau-Charm ? 2

BINP’s colliders: 2E=0.3-11.0 GeV (5 quarks of 6!) 2Е=2.0-5.0 GeV

VEPP-2M Collider Complex operated 1974-2000; Lmax=4x1030cm–2sec–1 at E0=510 MeV; Total integrated luminosity 80 pb–1. Some results: - Development of the resonant depolarization technique for precise measurements of particles masses (from 1975) - Detailed study of K, , , and - mesons (precise measurements of parameters, rare decays and etc)

Results of e+e– annihilation cross section measurements by SND and CMD-2 detectors at VEPP-2M presicion now is ~1% and will be improved to ~0.3% at VEPP-2000! These measurements are necessary for determination of g-2 and  5

+(g-2/EDM experiment at JPARC) e+e-  hadrons measurements ! g-2 measurements    Theory BNL Expected precision at Fermilab 4 times better! +(g-2/EDM experiment at JPARC) New challenge for e+e-  hadrons measurements ! Fermilab

Injection Complex and beam transfer lines Injection Complex VEPP-5 providing both BINP colliders VEPP4M and VEPP-2000 with the electron and positron beams Achieved Parameters (2016): Energy: 395 MeV Storage rate e- @ 12.5 Hz: 4.0·1010/s (70 mA/s) Storage rate e+ @ 12.5 Hz: 4.0·109/s (7 mA/s) Max. beam current e- : 100 mА, 4.2·1010 particles Max. beam current e+ : 70 mA, 2.9·1010 particles Beamline to VEPP-4M 130 m Conversion System Beamline to VEPP-2000 250 m Beam @ VEPP-4M Beam @ BEP Injection Complex and beam transfer lines

VEPP-2000 e+e- collider @ Novosibirsk VEPP-2000 complex K-500 beam transfer channel BINP Injection complex Design parameters @ 1 GeV Circumference 24.39 m Number of bunches 1×1 Betatron tunes 4.1/2.1 Beam-beam parameter 0.1 Beam energy range 160  1000 MeV Number of particles 11011 Beta-functions @ IP 8.5 cm Luminosity 11032 cm-2s-1 Final focusing 13T solenoids Commissioned in 2009 with old injection chain. Data collection 2010-2013. Upgrade 2013-2016 (new injection complex, booster top energy increase). Injection chain commissioning 2016, regular operation 2017.

VEPP-2000 re-commissioning Stacking rate 2×108 e+/sec @ 390 MeV (×10 in comparison to old system) K-500 transfer channel and beam @ scintillator screen I, mA Beam scrubbing @ VEPP-2000 e+ e test beams @ “warm” VEPP-2000 20/21

Round Colliding Beams @ VEPP-2000 World record beam-beam parameter value achieved:  ~ 0.12/IP Averaged luminosity (CMD-3 data, 2010-2013) Limited e+ production rate Target luminosity integral: 10 times higher, 1fb-1 (now achievable with new injector)

Physics at VEPP-2000 Study of hadronic cross sections e+e– →2h, 3h, 4h …, h= ,K,,… Precision measurement of R=(e+e– → hadrons)/ (e+e–→+–) Study of light vector mesons excitations: ’, ’’, ’, ’,.. Comparison of the energy dependence of e+e– → hadr. (I=1) cross sections with spectral functions in t -decays Measurement of the nucleons electromagnetic form factors and search for NN- resonances Study of e+e– -annihilation into hadrons at low energy by radiative return (ISR) Two-photon physics High order QED processes At least 10 years of very interesting physics in future !

SND at VEPP-2000 Advantages for VEPP-2000: 1 – beam pipe, 2 – tracking system, 3 – aerogel, 4 – NaI(Tl) crystals, 5 – phototriodes, 6 – muon absorber, 7–9 – muon detector, 10 – focusing solenoid. Advantages for VEPP-2000: 1- cherenkov counter, n=1.05, 1.13 – e/pseparation E<450 MeV, p/K separation E<1 GeV, 2 –drift chamber – better tracking

Detector CMD-3 Mu LXe ДК ZК TOF CsI BGO

Some new results from SND and CMD-3 e+e-  pp e+e-  NN e+e-  nn _

ОБНОВИТЬ e+e-  6π by CMD-3 BaBar CMD-3 Phys.Lett. B723 (2013) 82-89   Phys.Lett. B723 (2013) 82-89 15

Center-of-mass energy, GeV SND results in 2016 Five processes of e+e– →hadrons were studied by SND in 2016: e+e– →π0γ, K+K–, π0π0γ, π+π–π0η, ωπ0η. Cross sections of the processes e+e– →π+π–π0η and ωπ0η were measured for the first time. e+e– →ωπ0η e+e– →π+π–π0η Center-of-mass energy, GeV

VEPP-4M Collider 4. Detector KEDR 2Е=211 GeV L=2х10**30 см-2с-1 ROKK-1M 2Е=211 GeV L=2х10**30 см-2с-1 L= 8х10**31 см-2с-1

Detector KEDR 2004-2011 L= 21 pb-1 was collected: study of - mesons, D-mesons, -lepton, R-measurements and etc. 2012-2013 – upgrade and repair 2014-2017- next run

VEPP-4M and KEDR detector The luminosity of VEPP-4M is lower than at B-factories But some advantages: Large energy region 2Е=211 GeV Technology of high precision measurement of the beam energy (concentration on high precision particle mass measurement). Detector KEDR equipped by LKr calorimeter with high energy and space resolution. High resolution tagging system (two-photon physics). Physics at VEPP-4M & KEDR is concentrated on high precision measurements High precision measurements of particle masses: J/, (2S), (3S), D-mesons, -lepton, (1S) (2S) (3S), Y(4S) Spectroscopy of cc and bb states The measurement of R in the energy region 2E=2-7 GeV Two photon physic: total cross section hadrons , study of C-even states

High precision measurements at VEPP-4M&KEDR VEPP-4M energy calibration Resonance depolarization Compton backscattering J/, (2S), (3S), D-mesons, -lepton masses and some other parameters of these particles have been measured with best precision using these methods Best known particle masses 

Super Charm-Tau Factory Detector Existing new injector complex (in 2013 – operation with positron beam) е-е+ convertor Linac 2 GeV Two rings Ист.е- Linac 500 MeV Ист.е- Tunnel for 2 GeV Linac is ready Damping Ring Two rings Crab waist L = 1×10**35 cm-2s-1, Variable energy Ecm= 2 – 5 GeV Longitudinal polarization

Super C/tau Factory at Novosibirsk (physics) ► D-Dbar mixing ► CP violation searches in charm decays ► Rare and forbidden charm decays ► Standard Model tests in  leptons decays ► Searches for lepton flavor violation t→mg ► CP/T violation searches in  leptons decays Requirements: L > 1035 cm-2 s-1, longitudinal polarization, General Purpose with perfect PID

Polarization at Super C/tau Factory If even one beam polarized,  almost 100% longitudinally polarized near the threshold Michel parameters CP-violation in -decays Polarization may increase sensitivity by several times!

Artistic view of future Charm-tau factory Accelerator Complex 207 MEuro Detector 91 MEuro Buildings infrastructure – 100 MEuro BINP has already invested 37 MEuro in the capital construction and injection complex

Super Tau-Charm factory project status and plans Project was preliminary approved by Russian Government (2011) CDR –has been completed (2012) Road map –is ready (6 years for realization) Very positive statement of ECFA (2012) Collaboration is growing (now 10 Institutes from Russia and 9 Institutes from other countries) Design of the building has been completed (2013) Conceptual model for computing is ready (2013) R@D for machine and detector in progress Injection complex construction in progress Very positive reply of EU review Committee (2013) Funding decision and construction ?

Conclusion A few generations of colliders and detectors successfully operated at Budker INP with world-wide recognized contributions to particle physics VEPP-4M and VEPP-2000 with 3 detectors are in operation at present interesting physics in the coming years Budker INP successfully collaborates in a few outstanding experiments outside Super Tau-Charm is the future (but funding approval is necessary!)