Budker INP, Novosibirsk

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Presentation transcript:

Budker INP, Novosibirsk Super c/t factory Budker INP, Novosibirsk Bondar A. ECFA, 12 March, 2011, Vienna

Physics at -charm factory Precision charm physics Precision charm precision CKM (strong phases, fD, fDs ,form-factors…) Unique source of coherent D0/D0bar states (D0 mixing, CPV in mixing, strong phases for f3 measurements at SuperB and LHC) Precision -physics with polarized beams Lepton universality, Lorentz structure of -decay… CP and T-violation in t and c decays LFV decays (t->mg) Second class currents (with kinematical constraints at threshold) High statistic spectroscopy and search for exotics Charm and charmonium spectroscopy Spectroscopy of the highly exited Charmonium states (complimentary to Botomonium) Light hadron spectroscopy in charmonium decays

Advantages of near threshold production Particle multiplicity at 3.77 GeV is about two times lower than at 10.6 GeV Close to threshold the additional kinematical constraints can suppress combinatorial background ( useful for second class currents studies) Two body production e+e-DD. This allows to use double tag method: fully reconstruct one D then either fully reconstruct the other D (absolute branching ratios) or look for events with one missing particle (leptonic, semileptonic decays) Coherent production of D pairs allows to use quantum correlations for D-meson mixing and CP violation studies

Polarization Michel parameters CP-violation in -decays and/or LC If even one beam polarized,  almost 100% longitudinally polarized near the threshold Michel parameters CP-violation in -decays and/or LC CP-violation  new physics, charged Higgs Two amplitudes with different weak and strong phases Observables Rate asymmetry: (+f+)-(-f)~sin sin Triple product asymmetry (T-odd) (p1p2) T+-T-~cos sin For complete description of matrix element , polarization and direction of  should be known Polarization may increase sensitivity by several times

LFV decays  decay Current limit: ~ 310-8 by Belle with 7108  Super-B, 75 ab-1 71010 -pairs  decay Current limit: ~ 310-8 by Belle with 7108  At Y(4S): ISR background e+e-+- Upper Limit  1/L tau-charm factory with 1010  will have better sensitivity

ISR Spectrum At near threshold Eg for eettg background cannot be as high as Eg for tmg. Background from eemmg will become more important.  good MUID is essential. Eg (CMS) from tmg and ISR(ttg) U(4s) maximum s H.Hayahii 2008

Backgrounds Combinatorial background from t+t- events QED processes Continuum background Charm Anything else? t(mnn)t(pp0n) 2E=3.77GeV t(mg)t(pn) Level of the sensitivity c/t factory to Br(t->mg)<10-9

Quantum correlated DDbar states Quantum correlated DD state decay is a instrument for strong phase measurement in the hadronic D-meson decays D mixing contribution to the KSπ+π– Dalitz plot distributions for even and odd DD states is different. It can be used for CPV and Mixing parameters measurement in the time integrated mode !

D mixing in time integrated mode at c/t Factory p- p+ e/m+ K- KS n g/p0 Pure DD final state (ED(*) = Ebeam) Equal to Y(3770) cross-section of DD Low particle multiplicity ~6 charged part’s/event Good coverage to reconstruct n in semileptonic decays Pure JPC = 1- - initial state - Flavor tags (K-+ ,K-+ 0,K-+ -+), Semileptonic (Xe) e+e- -> KSπ+π– + K+ p – (CLEO-c)

MC Sensitivity (KSπ+π–+ K+l –n ) 1ab-1 s(yD)=0.9 10-3 s(xD)=1.3 10-3 s(fCP)=2.3 o s(|q/p|)=3.6 10-2 If sensitivity of other states is comparable, the total statistical uncertainty should be 2-3 times better.

SuperB sensitivity

CLEOc Observation of e+e- -> hcp+p- Ryan Mitchell @ CHARM2010 Signal of Y(4260)→hc+- ?  Rate of Yb→hb+- is high?  Search for hb in (5S) data

CLEOc observation motivated Belle for hb search at Y(5S) Preliminary 2S1S 3S1S 121.4 fb-1

Technical specifications for Super c/t factory Beam energy from 1.0 to 2.5 GeV Peak luminosity is 1035 cm-2s-1 at 2 GeV Electrons are polarized longitudinally at IP On-line energy monitoring (~5÷1010-5) Main features of the Super c/t factory design Two rings with Crab Waist collision scheme and single interaction point Sub-mm beta-y at IP Preserving of damping parameters (by 4 SC wigglers) through the whole energy range to optimize the luminosity 5 Siberian snakes to obtain the longitudinally polarized electrons for the whole energy range Highly effective positron source (50 Hz top-up injection) Polarized electron source 2.5 GeV full energy linac

Main ring schematically

Polarization degree vs energy

Luminosity betatron tune scan CW advantage: BB coupling resonances are suppressed Dn~0.2 is feasible Wide red area corresponds to 1035 cm-2s-1 Vertical tune Horizontal tune

Super factories accelerator challenges SB-INFN Similar (Nanobeam/CW) approaches yield similar problems in accelerator design All problems typical for Crab Waist/Nanobeam machines could be solved in collaborative manner by accelerator physicists

Detector Ultimate Hermeticity PID e/m/p/K separation up to 2GeV/c CDC TPC ECL Photon Detectors SiPM Aerogel Tiles m momentum range in t->mg Ultimate Hermeticity PID e/m/p/K separation up to 2GeV/c Momentum resolution Low pT track efficiency ECL energy resolution Low energy (~20MeV) photons efficiency

Artistic view of future machine Accelerator Complex 200 MEuro Detector 80 MEuro Buildings Construction and Site Utilities 50 MEuro

Project status and plans CDR –in progress (to be ready in November 2011) Collaboration is growing (now 10 Institutes from Russia and 9 Institutes from other countries) Design of the buildings –in progress (funded) Injection complex - beginning of commissioning Funding decision – end of 2012 ? Construction 2012-2017?