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DGWG and Physics STATUS REPORT

DGWG and Physics STATUS REPORT. PHYSICS : Adrian Bevan, David Brown, Marco Ciuchini, Achille Stocchi DGWG : Matteo Rama, Achille Stocchi. DGWG. Layer0. Impact of Geometry on sensitivity + Background related issues B  K nn , B  tn. SVT. Forward PID. Internal Geometry.

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DGWG and Physics STATUS REPORT

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  1. DGWG and Physics STATUS REPORT PHYSICS : Adrian Bevan, David Brown, Marco Ciuchini, Achille Stocchi DGWG : Matteo Rama, Achille Stocchi

  2. DGWG Layer0 Impact of Geometry on sensitivity + Background related issues BK nn, Btn SVT Forward PID Internal Geometry E. Manoni, A. Perez, A. Ratikin FPID vs FEMC IFR PHYSICS PID/EMC Material Ammount Of material S. Germani BEMC DCH IFR Optimisation Radius SVT vs DCH PID Issues G. Cibinetto, M. Rotondo [shown in the IFR Plenary]

  3. Physics B-Physics : BK nn, Btn, Flavour Tag, B->h' K0 E. Manoni,A. Perez, A. Rakitin, S. Stracka,P. Biassoni Spectroscopy B Physics Is polarization important ? NP Mixing and CPV Other Physics Rare Decays Phenomenology Tau LFV /CPV , EW precision tests Exotica A. Cervelli M. Roney Status Report Spectroscopy t Charm R. Faccini Charm @ Threshold B. Meadow et charm coll. Phenomenological/Interplay Recent progress M. Ciuchini, L.Silvestrini , S.Jaeger

  4. PHYSICS Fits - present situation L. Silvestrini et al. Is the fit showing some discrepancy ? tensions for some observable • B tn and sin2b pulls on • |Vub| on opposite direction • MFV cannot improve • agreement on sin2b and Bs • Large tanb generate effects • in wrong direction.. And also

  5. Updated plots after including CDF update and new D0 results D0 measures a Amm asymmetry very/too large

  6. PHYSICS Interplay activities in SuperB M. Ciuchini et al. Quite ”complete” work done to look at NP SuperB observable and correlations among these observable NP Models 4th generation ACP(bsg) S(J /y f)

  7. MSSM+generic soft SUSY breaking terms In the red regions the d are measured with a significance >3s away from zero 1 10-1 10-2 Here the players are : = (0.026 ± 0.005) • (BXs) • (BXsl+l) • ACP(BXs) Arg(d23)LR=(44.5± 2.6)o 1 TeV 1 10 LHT models

  8. PHYSICS Best tetraquark candidate Isospin triplet ? Spectroscopy + other physics R. Faccini et al. Light mesons, charmonomium, bottonomium Building a new spectroscopy – strong interplay experiment-theory Example : charmonium Many of such a table are now constantly updated and show that much higher statistics is needed to study the new spectroscopy and clarify the picture • OTHER TOPICS IN SPECTROSCOPY • Light scalar nonet is a tetraquark ? Y(2175) another • tetraquark • Bottonomium : five narrow resonances still missing • U(5S,6S) results ?  Interest of scanning between • U(4S) and LBLB • OTHER PHYSICS • Light Higgs U(nS) Ag  ttg • Dark Matter in light Upsilon decays U(1S)nn • Dark forces

  9. PHYSICS • Dalitz plot model uncertainty shrinks • Information on overall strong phase is added Uncertainty inxDimproves more than that of yD Interest of running @ threshold B. Meadow et al. 500 fb-1 at (3770) Decays of (3770)  D0D0 produce coherent (C=-1) pairs of D0’s. Quantum correlations in their subsequent decays allow measurements of strong phases • Required for improved measurement of CKM  • Also required for D0 mixing studies

  10. FCNC D0 +- The SM estimates a lower limit BF > 4 x 10-13 Estimates would be improved by measurement of D0  D0gg • Best limit so far comes from CLEO 2.9x10-5 using 13.8 fb-1 at (4S) • BaBar “expects” 2.5 x 10-6 from 481 fb-1 at (4S) which implies, for Super B ~2 x 10-7 from 75 ab-1 at (4S) A recent CLEO-c study show that the background can be reduced and we can aim for SuperB @ charm threshold ~few x 10-8 from 500 fb-1 at (3770) + • Semi-leptonic asymmetries – aSL • Time-Dependent Quantum • Correlations (TDQC) • Other Rare decays such as D0hl+l- • … “Conclusions” A strong case for a 500 fb-1 run at (3770) still to be worked. Clearly not based on a single measurement but rather on a great breadth of excellent results to support other findings at Super B

  11. PHYSICS Electroweak measurement @ SuperB POLARISATION NEEDED M. Roney et al. 0.5% polarization syst. 0.3% stat. error  0.0021 Important point : The L-R luminosity asymmetry has to be very well controlled. Possibly done using monitoring using Bhabhas. Thought needed

  12. PHYSICS t Physics and POLARISATION A. Cervelli Reduce the “irreducible” backgrounds is to using decay dynamics Simulation P=80% Helicity angle qh both tag and signal side To do lists :  Backgrounds to be included  Cuts to be optimized  UL to be calculated

  13. DGWG/PHYSICS Activities on time-dependent measurements ( B h’Ks ) • Tagging Tagging tools are ready • First results on B h’(pp) Ks analysis • Some work in comparing different Det. Geom P. Biassoni / S. Stracka Today Stat. error can be pushed down to 0.007… and syst ? Preliminary studies show that  50% reduction is possible  0.007..  More work to push further down ..0.001 Work also started for comparing different Detector Geometries

  14. DGWG/PHYSICS Forward PID (FPID) yes or not ? (seen by a golden mode B Knn) E, Manoni, A. Perez et al. These plots show a gain of ~5-6% on S/sqrt(S+B) Equivalently : gain to reach 5s of ~5ab-1 over ~50 ab-1 collected gain to reach 5s of ~4ab-1 over ~45-50 ab-1 collected From Babar configuration ( used for CDR) to SuperB gain on significance ~>12-13%

  15. Br(B  K n n) – Z penguins and Right-Handed currents With errors obtained so far from FastSim and detector + FPID 50ab-1 h Br(B K*nn) SM Br(B Knn) Only theo. errors Longitudinal polarization should be added e today SuperB @ 50ab-1 NP potential from golden channel with SuperB and improved detector This is the kind of plot we want ! (..many more for TDR) h e

  16. BEMC in veto mode for other analyses like Knn. Preliminary results : 20% background reduction. but is a (20±10)% ! Reduction of 20% of the Background, have important impact Important : We need a larger generic background production

  17. DGWG/PHYSICS Should we generate more effectively the BB background ? E, Manoni, A. Perez, A. Ratikin Physics BB background composition for the semileptonic Breco BKnn We can gain generate more effectively the BB backgrounds using dedicated “cocktails” ! With : 0.25  0.5 ~ [0.10-0.15] of total Br We cover ~90% of the BB physics background Very similar results for hadronic Breco BKnn Work is going on also for hadronic Breco Btn All these results will be used for the July production

  18. DGWG/PHYSICS Impact of machine background on Physics observable BKnn: Eextra vs radBhabha rate (25% is the one expected) selection cuts loosened otherwise not enough stat for generic BBbar

  19. DGWG - Open ISSUE Effect of the PID material to the FEMC in the forward region S. Germani/C.Cecchi • Generation of single photon with Bruno • Mixing with Bhabha background events from February production • Sum of all the energy deposit in a given time window • Clustering and assign the cluster to photon For this distributions there is material FTOF-like ~10%X0 Background has the effect of make energy resolution distributions more Gaussian (at least for this amount of material)  Evaluate the energy resolution using FWHM

  20. DGWG - Open ISSUE Time window 100ns Time window 300ns FTOF FTOF In case of no background at X0 =0 resolution ~2% for Eg=100MeV [FWHM good ”estimator”, if X0<(15-20)% since distribution are rather Gaussian] Negligible effect of the material in front of FEMC if X0<(15-20)%

  21. Conclusions and Perspectives DGWG Quite a lot of work done in the DGWG. Still open questions on FPID and BEMC. And relations with other detectors (FEMC) BKnn and B tn, Time dependent analyses (Bh’Ks) start to give quantitative results with different Detector Geometries Aim to add other golden channels New production with a larger BB background sample needed More expected for Frascati meeting • PHYSICS White Paper. Significant updates with respect to CDR • B Physics. Some sensitivity studies done • Charm sector revisited. New work done to motivate the running @ threshold • Tau sector. LFV is still one of the most important golden channel. • Polarization : motivations should come from t sector. • Spectroscopy is now really part of the Physics Program. Rich • EW measurements “new entry” extremely interesting. • Phenomenology : a rather complete collections of models on the market is now • available. Few update of the work done for CDR now available.

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