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FCAL and Super Belle

FCAL and Super Belle. Leszek Zawiejski. ■ Motivations ■ Requirement to improve super-Belle detector hermeticity ■ FCAL detectors and super-Belle proposal ■ Problems, questions – starting point for discussion on the proposal. FCAL Collaboration Meeting , May 07, 2008, Kraków.

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FCAL and Super Belle

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  1. FCAL and Super Belle Leszek Zawiejski ■Motivations ■Requirement to improve super-Belle detector hermeticity ■FCAL detectors and super-Belle proposal ■Problems, questions – starting point for discussion on the proposal 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 Super B Factory B Factory Mt. Tsukuba KEKB Belle

  4. Belle Experiment Beam crossing angle :22 mrad peak luminosity: 1.71 x 1034 cm-2 s-1 world record 1.3 million B B pairs/ day Total ~770106 B B pairs _ _

  5. Evidence for D0 mixing Observation of direct CP violation in B gp+p- Evidence for B gtn Observation of b g dg Decisive confirmation of Kobayashi-Maskawa model Evidence for direct CP violation in B g K+p- Measurements of CP violation in B gfKs, h’Ks etc. Observation of CP violation in B meson system Discovery of X(3872) Observation of B g K(*)ll Major achievements at Belle Belle collaboration 13 countries ~400 collaborators As of June 2007 　# of papers : 219 # of citations: 9883 1. P Violation in B Decays 2. Fundamental SM Parameters (Complex Quark Couplings) 3. Beyond the SM (BSM) 4. Unanticipated New Particles

  6. Examples: B decays with missing energy - requirement to improve hermeticity of the Belle detector Examples:B  h , B+  + , Bo  D*-+ expected decay rates examples of SM amplitudes b c O(10-2) O(10-4) O(10-5)   W B0D*-+ Small hadronic effects; theoretically clean. b u   W B++ Sensistive to New Pysics W b s,d t B h   Z poorly known: multiple ’s in final states experimentaly difficult !

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

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

  9. E = Ei - Ebeam Mbc = E2beam-(pi)2 Bh(*) - method h(*) = K*+,K*0,K+,K0, +,0,+,0, Reconstruct Btag in hadronic mode: Btag  signal signature: h(*) h(*) + nothing (4S)  788K B  MC 535 MBB EECL: residual energy in calorimeter for signal: EECL 0 B candidates background suppression:1.6 < ph(*) < 2.5 GeV/c Mbc[GeV/c2] suppress bc reject 2-body (eg. BK*)

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

  11. B purely leptonic B decay: W-mediated annihilation theoretically very clean,SM BF: b u B decay constant   W fB=0.2160.022 GeV from LQCD HPQCD Collab., PRL 95, 212001 (2005) providingfB is known Sensistive to Charged Higgs Heffects to branching fraction: b u H   mbtan+mccot mtan Decay amplitude  mb m tan2 W. S. Hou, PR D 48, 2342 (1993) Maria Rozanska for the Belle Collaboration

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

  13. BD(*) mbtan+mccot b c b c      W H 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.

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

  15. Forward Region

  16. K.F Chen, C. Peng

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

  18. LumiCal calorimeter 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 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? Angular coverage from ~ 30 mrad to 80 mrad (ILD installation place)

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

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

  21. 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

  22. PROBLEMS - QUESTIONS 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 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.

  23. 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.

  24. Strategy of super-Belle collaboration

  25. Roadmaps : KEKB Experiment + upgrade

  26. 2011 2012 2010 2009 2005 2006 2007 2008 GDE process RDR TDP 2 Tech, Design Phase 1 CLIC R&D EUROTeV and ILC construction commissioning LHC physics physics site selection EUDET

  27. 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

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