1. FCAL and Super Belle ■ Motivations ■ Requirement to improve super-Belle detector hermeticity ■ FCAL detectors and super-Belle proposal ■ Problems, questions – starting point for discussion on the proposal Leszek Zawiejski FCAL Collaboration Meeting, May 07, 2008, Kraków Slides on Belle results are based on M. Różańska, M. Yamauchi, M. Hazumi prezentations

2. Motivations I High precision physics which can be studied with super-Belle detector II Test in running experiment, FCAL detectors before realisation of the ILC project

3. B meson yield B Factory Super B Factory Super B Factory KEKB Mt. Tsukuba Belle

4. Belle Experiment 1.3 million B B pairs / day Total ~770  10 6 B B pairs _ _ peak luminosity: 1.71 x 10 34 cm -2 s -1 world record Beam crossing angle :22 mrad

5. Major achievements at Belle Evidence for direct CP violation in B  K +   Evidence for direct CP violation in B  K +   Evidence for B   Observation of b  d  Observation of B  K (*) ll Decisive confirmation of Kobayashi-Maskawa model Belle collaboration 13 countries ~400 collaborators As of June 2007 # of papers : 219 # of citations: 9883 Observation of CP violation in B meson system Observation of CP violation in B meson system Measurements of CP violation in B   Ks,  ’Ks etc. Measurements of CP violation in B   Ks,  ’Ks etc. Discovery of X(3872) Discovery of X(3872) Evidence for D 0 mixing Observation of direct CP violation in B      Observation of direct CP violation in B      1. P Violation in B Decays 2. Fundamental SM Parameters (Complex Quark Couplings) 3. Beyond the SM (BSM) 4. Unanticipated New Particles 1. P Violation in B Decays 2. Fundamental SM Parameters (Complex Quark Couplings) 3. Beyond the SM (BSM) 4. Unanticipated New Particles

9. Sensistive to New Pysics O (10 -2 ) O (10 -4 ) O (10 - 5 )  bubu WW WW bc b WW Z s,d t B 0  D *-  +  B  h  B +   +  expected decay rates Small hadronic effects; theoretically clean. examples of SM amplitudes poorly known: multiple ’s in final states  experimentaly difficult ! Examples: B decays with missing energy - requirement to improve hermeticity of the Belle detector Examples: B  h , B +   + , B o  D*-  + 

10.  (4S) B tag  K Two ways of B tag reconstruction: ■ Select B sig candidate and check whether remaining particles are consistent with B decay („inclusive” B tag reconstruction) ■ Reconstruct B tag (in exclusive mode) and check whether remaining particles are consistent with B sig („exclusive” B tag reconstruction) B tag reconstruction:  BB event  which particles belong to B sig  kinematical constraints on B sig signature: K + invisible reconstruct reconstruct B tag B tag at B-factories: e + e -  (4S)  BB B decay with missing energy e.g. B +  K + B sig P sig = - P tag Experimental Techniques

11. DAMA CDMS Expected BF’s in the SM: B  h (*) Flavor Changing Neutral Current process: Z-mediated electroweak penguin + box diagrams b WW Z s,d t b WW WW t b s,d t Sensistive to New Physics in loops, e.g.: b h s,d other weakly coupled particles: possible window to light dark matter, not accessible in direct searches e.g. C. Bird et al., PRL 93, 201803 (2004) J. H. Jeon et al., PL B 636, 270 (2006) SSSS 

12. B  h (*) - method h (*) = K *+,K *0,K +,K 0,  +,  0,  +,  0,   E =  E i - E beam M bc =  E 2 beam -(  p i ) 2  (4S) B tag h (*) B  candidates 788K B  h (*) + nothing Reconstruct B tag in hadronic mode: signal signature: M bc [GeV/c 2 ] E ECL E ECL : residual energy in calorimeter for signal: E ECL  0 E ECL E ECL : residual energy in calorimeter for signal: E ECL  0 535 M  BB MCMCMCMC 1.6 < p h (*) < 2.5 GeV/c background suppression : 1.6 < p h (*) < 2.5 GeV/c reject 2-body (eg. B  K*  )suppress b  c

13. B  h (*) - results 535 M  BB hep-ex/0707.0138 submitted to PRL 1.6 < p* < 2.5 GeV/c N b = 20.0  4.0 N obs = 10 BF(B +  K + ) < 1.4x10 -5 @90% CL K + momentum signal SM BF  20 Theoretical predictions: C. Bird et al., PRL 93, 201803 (2004) Light dark matter? Can be searched in super-Belle B  K * ( or  )

14. Karlsruhe SUSY07Maria Rozanska for the Belle Collaboration 14 B    bubu WW bubu HH purely leptonic B decay: W-mediated annihilation theoretically very clean, SM BF: B decay constant f B =0.216  0.022 GeV from LQCD HPQCD Collab., PRL 95, 212001 (2005) Sensistive to Charged Higgs m b tan  +m c cot  m  tan  Decay amplitude  m b m  tan 2  H  effects to branching fraction: providing f B is known providing f B is known W. S. Hou, PR D 48, 2342 (1993)

15. 449 M  BB PRL 97, 251802 (2006) B   - results Constraint on Charged Higgs (2HDM II) excluded taking |V ub | = (4.39  0.33)×10 -3 from HFAG rHrH

16. B  D (*)   WW  bc HH bc m b tan  +m c cot   m  tan  Theoretical tool: Heavy Quark Effective Theory (HQET) Sensitive to extended Higgs sector New Physics at tree level Sensitive observables e.g.  polarization; possible O (1 ) effects Expected SM BF’s~ O (10 -2 ) inclusive BF(b  c   ) = (2.48  0.26)% from LEP PDG 2007 Y.Okada: CP violation & CKM; plenary talk at ICHEP06 H-b-u vertex measured in B    H-b-c vertex measured in B  D   H-b-t vertex measured in direct production by LHC.

17. Forward Detector K.F Chen, C. Peng

18. Forward Region

19. K.F Chen, C. Peng

20. Pair Monitor FCAL detectors – candidates for use in Belle upgrade project?

21. LumiCal calorimeter The current design: Several (  3 ) sensor layers can be used as tracker detector? Can an increase in granularity will be acceptable for FE electronics design as was prepared recently for ILC? EM Si/W calorimeter with 30 layers with the following thicknesses: Tungsten - 3.5 mm Silicon sensor - 0.32 mm Support - 0.6 mm Electronic space - 0.1 mm Inner radius of the active area : 80 mm Outer radius : 195 mm Sensor segmentation – 64 cylinders with 48 sectors in azimuth Calorimeter can be placed 2270 mm from IP Angular coverage from ~ 30 mrad to 80 mrad (ILD installation place)

22. LumiCal extension : add silicon tracker (pad/pixel layers?

23. (pCVD, GaAs, sCVD, radiation hard Si)

25. Possible places for FCAL detectors at super-Belle The central region - Yoshuke talk or somewhere outside the central region ? FW 5.3 – 11.1 degree, BW 165.1 – 172.7 degree

26. Proposal to install FCAL detectors in super-Belle detector creates several problems and questions. Sensors&mechanics  What sensors(silicon/diamond/GaAs) granularity seems to be sufficient?  How many layers?  What will be optimal type of the detector: calorimeter (tungsten/sensors) and tracker (with a few layers) or only tracker (pads, pixels layers)  How big energy deposit can be expected in sensors (shower, MIP’s)?  What power will be distributed by FE electronics – a way of cooling  Radiation dose( during for example in year operation) ?  Place – how far from IP? Depends on type of the selected detector, accepted range for polar angle and background -outside the both sides of Belle detector, clamped on beam pipe? Monte Carlo (physics and detector ) studies can help to give answers for most of them PROBLEMS - QUESTIONS FE electronics& readout What will be occupancy? Manpower and short time is a big problem: if the FE and readout electronics (ASIC,fanout) as designed for ILD detector can be used (with small modifications) for super-Belle project.

27. Discussion on possible participation in super-Belle ?  How useful in realization of ours ILD tasks can be experience obtained by work of FCAL detectors in super-Belle experiment ?  Which FCAL groups (worked on the corresponding detector) can really be interested?  From realisation of the particular scientific tasks in Institutions working in FCAL, such group should became an official member of super- Belle collaboration  Timetable : what is exactly a death time for installation of FCAL detector (s) inside super-Belle - 2012? It will be necessary to estimate more precisely available menpower and cost.  Financial support – requested money, with help from super-Belle collaboration? Such money should cover the build the prototypes, temporary work of specialists, travel expences, staying in KEKB. The possibility to get a big money from national financial institutions (polish) are very limited.

28. Strategy of super-Belle collaboration

29. Roadmaps : KEKB Experiment + upgrade

30. RDR Tech, Design Phase 1 GDE process physics 2005200620072008 2012 2009 2010 2011 LHC physics CLIC R&D EUROTeV TDP 2 construction commissioning site selection EUDET and ILC

31. Summary  Super Belle Physics program will be very excited  An increase of the detector hermeticity help in selection rare processes  FCAL detectors (with possible modifications), can play important role in suplaying information on the missing energy (for selection the very clean sample of events)  One can expect big problems with manpower, money, short timetable for realisation, formalities how to become the official member of super Belle collaboration  Futher discussion on possibility to join the project is necessary