DGWG and Physics STATUS REPORT PHYSICS Adrian Bevan

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

DGWG Layer 0 Forward PID FPID vs FEMC Impact of Geometry on sensitivity + Background related issues B K nn, B tn SVT Internal Geometry PHYSICS E. Manoni, A. Perez, A. Ratikin IFR Ammount Of material BEMC DCH PID Issues Radius SVT vs DCH PID/EMC Material S. Germani IFR Optimisation G. Cibinetto, M. Rotondo [shown in the IFR Plenary]

Physics B-Physics : B K nn, B tn, Flavour Tag, B->h' K 0 E. Manoni, A. Perez, A. Rakitin, S. Stracka, P. Biassoni Spectroscopy Exotica B Physics Other Physics Phenomenology Rare Decays NP Mixing and CPV Is polarization important ? Tau LFV /CPV , EW precision tests A. Cervelli M. Roney Status Report Spectroscopy Charm t R. Faccini Charm @ Threshold B. Meadow et charm coll. Phenomenological/Interplay Recent progress M. Ciuchini, L. Silvestrini , S. Jaeger

Fits - present situation L. Silvestrini et al. PHYSICS Is the fit showing some discrepancy ? tensions for some observable • B tn and sin 2 b pulls on |Vub| on opposite direction • MFV cannot improve agreement on sin 2 b and Bs • Large tanb generate effects in wrong direction. . And also

Updated plots after including CDF update and new D 0 results D 0 measures a Amm asymmetry very/too large

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

MSSM+generic soft SUSY breaking terms In the red regions the d are measured with a significance >3 s away from zero 1 = (0. 026 ± 0. 005) Here the players are : 10 -1 • (B Xs ) • (B Xs l+l ) • ACP(B Xs ) Arg(d 23)LR=(44. 5± 2. 6)o 10 -2 1 Te. V 1 10 LHT models

R. Faccini et al. PHYSICS Building a new spectroscopy – strong interplay experiment-theory Light mesons, charmonomium, bottonomium Spectroscopy + other physics Example : charmonium Best tetraquark candidate Isospin triplet ? 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(5 S, 6 S) results ? Interest of scanning between U(4 S) and LBLB OTHER PHYSICS • Light Higgs U(n. S) A tt • Dark Matter in light Upsilon decays U(1 S) nn • Dark forces

Interest of running @ threshold 500 fb-1 at (3770) B. Meadow et al. PHYSICS Decays of (3770) D 0 D 0 produce coherent (C=-1) pairs of D 0’s. Quantum correlations in their subsequent decays allow measurements of strong phases §Required for improved measurement of CKM §Also required for D 0 mixing studies q Dalitz plot model uncertainty shrinks q Information on overall strong phase is added Uncertainty in x. D improves more than that of y. D

FCNC D 0 + - D 0 gg The SM estimates a lower limit BF > 4 x 10 -13 Estimates would be improved by measurement of D 0 • • Best limit so far comes from CLEO 2. 9 x 10 -5 using 13. 8 fb-1 at (4 S) Ba. Bar “expects” 2. 5 x 10 -6 from 481 fb-1 at (4 S) which implies, for Super B ~2 x 10 -7 from 75 ab-1 at (4 S) A recent CLEO-c study show that the background can be reduced and we can aim for Super. B @ charm threshold ~few x 10 -8 from 500 fb-1 at (3770) + • Semi-leptonic asymmetries – a. SL • Time-Dependent Quantum Correlations (TDQC) • Other Rare decays such as D 0 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

Electroweak measurement @ Super. B POLARISATION NEEDED 0. 5% polarization syst. 0. 3% stat. error 0. 0021 PHYSICS M. Roney et al. Important point : The L-R luminosity asymmetry has to be very well controlled. Possibly done using monitoring using Bhabhas. Thought needed

t Physics and POLARISATION A. Cervelli PHYSICS 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

DGWG/PHYSICS Activities on time-dependent measurements ( B h’Ks ) 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

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

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

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

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

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

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%X 0 Background has the effect of make energy resolution distributions more Gaussian (at least for this amount of material) Evaluate the energy resolution using FWHM

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

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 More expected for Frascati meeting BB background sample needed 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.