Summary of BNM1andGoals of BNM2 M. Hazumi (KEK)
BNM1 workshop • BNM = B factories and New Measurements • Sep.13-14, 2006 at KEK • http://www-conf.kek.jp/bnm/2006/ • 100 participants • 49 talks ! • Many new ideas proposed ! This workshop (BNM2) is a follow-up of BNM1.
50ab-1 SuperB 1ab-1 s U(4s) New ideas in 3+1 dimensions 4th dimension = theory Integrated Luminosity Detector performance We are here. U(3s) U(5s)
Luminosity Budget at Belle as of Summer 2006 U(3S) ~ 3/fb U(5S) ~ 24/fb Off-resonance ~ 60/fb U(4S) ~532/fb Your new ideas will change the budget in the future (at Belle and a Super B factory).
Topics at BNM1 • Upsilon(5S) and other energies • New Detectors • New ideas on Upsilon(4S) • Physics at Super B factories
1) Upsilon(5S) and other energies • Bs physics with 100-500/fb on Upsilon(5S) (A.Drutskoy) • Advantages: good g rec., high trigger eff., modes with n accessible • Observation of Bs ggg, fg: sensitive to new physics • Measurement of DG (before LHCb) with Bs g Ds(*)Ds(*) • Why don’t we consider Lb, Bc, Xb (CM energy up to ~ 14 GeV) ? • Bs physics with 1-30/ab (M.Pierini) • Simulation studies for Bs g mm, J/f • Simulation studies for ASL, f3 with Bs g Kpp0, Vts/Vtd with Bs gfg, K*g photons neutrinos Advantages at e+e- B factory
Upsilon(1S,2S,3S) • Light dark matter (LDM) (B. McElrath) • Upsilon gcc (c: dark matter particle) • Motivation and search methods discussed • e+e- B factory is the best place to search for LDM with mass < mb • Best choice for LDM is Upsilon(3S) (O. Tajima) • e+e- g Upsilon(3S) gp+p-Upsilon(1S), Upsilon(1S) gcc (invisible) • Belle’s engineering run on 3S and prospects shown • Very light (MeV) dark matter (D. Choudhury) • Motivated by unexpectedly large 511keV g from galactic center • e+e- g Ug (U: spin-1 boson coupling to both e+e- and cc) • Test of lepton universality (M. Sanchis-Lozano) • ratios of branching ratios for Upsilon gee, mm, tt at a few % level • Enhanced Upsilon gttg in some new physics models (e.g. NMSSM) results in larger Upsilon gtt branching fraction (due to soft photons) • Complementary to LDM search (if LDM from NMSSM) • CP violation in Upsilon decay, and some thoughs on Upsilon g DD (H. Li)
O. Tajima 90 %C.L. limit by McElrath SM : Y(1S)nnbar ToyMC 10fb-1 O(1)/fb data sufficient to obtain interesting results
Proposal of testing lepton universality (to the percent level) at a (Super) B factory Data used in the CLEO analysis consisted of on resonance samples of 1.1 fb-1, 1.2 fb-1 and 1.2 fb-1 for the (1S), (2S) and (3S) amounting to about 20 M, 10 M and 5 M decays, respectively together with off-resonances samples of 0.2, 0.4 and 0.2 fb-1 For direct leptonic(3S) decays: In order to get a similar statistical error ( 8%) for the ratioR/ one should naively require the same integrated luminosity of 1.2 fb-1, i.e. 1 day of data taking at 1034 cm-2s-1 (as a reference value) To get a statistical errorof1% few days at 1034 cm-2s-1 With respect to thedecay chain(3S) π + π - (1S,2S) → l +l - despite a smaller combined BF an integrated luminosity of several fb-1 requiringseveral days of data taking at a B-factory sitting on the (3S) should be enough fortesting lepton universality to the few %level Similarly (or much better) for a Super B-factory running on the (4S) / (3S) M. Sanchis-Rosano
(1S) KSKS could be reached at future Super-B factory? • The design luminosity of super-KEKB: 81035 cm-2s-1 • The observed cross section of Y(1S) ( CLEO): 21.5nb • With one year running at super-KEKB: 1011 Y(1S) events/year • The current limit: BR((1S)K+K-)< 5 10-4 @90% C.L. • while the theoretical prediction: BR((1S)K+K-) 610-6 , • Assuming BR((1S)K+K-) = BR((1S)KSKL), one get: • BR(Y(1S) KSKS) 6.4 10-11 tiny! • Unfortunately, it is very hard to probe the CP violated processes • in Y(1S)K0K0bar decays! • Anyway, one has to search for (1S)KSKL /K+K- firstly. H. Li
Summary (2) Very Preliminary The Branching fraction of Y(1S)D0D0bar could be as large as 10-4, The number of D0D0bar @super-KEKB/year may be the same as those at BESIII with one year running. But we can use both time and coherent information to extract mixing and CP parameters. It is very interesting to make a quick measurements of the following processes: C=-1 , coherent production Incoherent production (background) Coherent and Time-Dependent Analysis! Toy MC study in progress. H. Li
Homework • One good figure to show constraints on DM • include all DM searches • Experimental considerations on MeV DM, lepton universality tests • Other topics not yet discussed • epsilon_b search • Measurement of as • LFV in Upsilon decays • (provocative statement): SuperB can give us 1012 Upsilon(1S). Why don’t we think about Upsilon(1S) gmt for example ?
2) New Detectors • TOP counter (K. Inami) • APDs for Aerogel RICH (Y. Mazuka) • PID in the forward region (S. Korpar) • Electromagnetic calorimeter upgrade (A. Kuzmin) • Speculation • Super-flat beampipe (N. Katayama) • Bs mixing meas. may be possible !? • Great continuum rejection • Very forward detector (M. Hazumi) • Improvement in full-reconstruction physics • Improvement in light DM search and similar searches
TOP counter Summary K. Inami • Square-shape MCP-PMT with GaAsP • Developing prototypes with HPK • Enough gain and TTS (~35ps) • Lifetime test has started. • Multi-alkali photo-cathode MCP-PMT: O.K. • Focusing system • >4.3s separation for 4 GeV/c • Test mirror performance • Checking accuracy Focusing mirror
A novel photo sensor of silicon APDs Y. Mazuka • 100~2000 pixels / typical size ~1mm2 • each pixel = independent silicon APD • Operated in Geiger mode • Number of fired pixels = Number of photons • Photon Detection Efficiency (PDE) • There are MRS-APD, SiPM, MPPC, etc Measured sample : Geometrical efficiency : Probability of Geiger discharge
Pure CsI for endcap ECL A. Kuzmin
3) New Ideas on Upsilon(4S) • photon conversion • Sp0p0 (Ishino, Yoshikawa) • 8-fold ambiguity 2-fold • DI=5/2 detected; important to distinguish b/w new physics and rescattering within SM • K*g (Nakao) • New access to right-handed current amplitude • B+gfK+g angular analysis (Soni) • Access to CP-violating phase in right-handed b g sg • Tiny SM pollution (had. uncertainty ~ ms/mb*l2 • T-odd asymmetry in B Lpp (Geng) • either T-odd asym. or direct CPV is sizable
4) Physics at Super B factoriesSummary of SuperKEKB sensitivity studiesWhat’s new, updated, missing ? Int. Lumi (ab-1) 0 5 10 20 30 40 50 RK 0.07 0.02 gray: no update from SuperKEKB LoI A10 13% 4% skyblue: updated from SuperKEKB LoI bgdg 7.5s yellow: New ! red circle: first observation ! explanatory note
Int. Lumi (ab-1) Full reconstruction modes 0 5 10 20 30 40 50 Btn 5s 10% 3% M(H+)>400GeV (2s) at tanb = 30 similar sensitivity from B Dtn Bmn firstname.lastname@example.org with present central value email@example.com with SM expectation BK+nn 5s@33ab-1 Very important progress on these clean modes ! Need to work on B K*nn, Ksnn Need to work on Bd m+m-, e+e-
Int. Lumi (ab-1) b s/d precision 0 5 10 20 30 40 50 RK 0.07 0.02 ACP(bgsg) 0.01 0.005 A9 11% 4% A10 13% 4% bgdg 7.5s S(Ksp0g) 0.1 0.03 S(r0g) 0.3 0.1 AR w/ gpol 3s if AR~AL S(KsKsKs) 0.105 0.037 S(fK0) 0.073 0.029 S(h’K0) 0.038 0.020 DA(Ksp0) 0.072 0.050
K. Hara Error on DS at Super KEKB DS errors @5ab-1 @50ab-1 KsKsKs 0.105 0.037 fK0 0.073 0.029 h’K0 0.038 0.020 3 mode combined 0.035 0.019
Int. Lumi (ab-1) CKM fit 0 5 10 20 30 40 50 f1 0.016 0.012 f2 2deg. f3 2deg. Vub(inclsv) 6.6% 6.1% Vub(exclsv) ~12% ~5%
K.F.Chen And many other sensitivity numbers how to use them for new physics studies ?
Y. Okada Tau LFV processes Tau LFV vs. mu LFV, Which is important? and their CP conjugates “Polarized” tau decay R.Kitano and Y.O. 2001 Angular correlation => polarized tau decay Muon polarization in t->3m, A.Matsuzaki
E6 GUT with U(2) like flavor symmetry Left-Right symmetric model with low energy seesaw. N.Maekawa, K.Sakurai B(t->mg)~10-8, B(m->eg)~10-11 M.Aoki t -->m-R g B(t->mll) ~10-8 possible (In other cases, B(m->3e) or B(m->eg) is more important.) SU(5) GUT with seesaw neutrino T.Goto B(t->mg)~10-8 possible (In other cases, B(m->eg) is more important.) t -->m-L g Tau LFV examples Different features about relationship between tau and mu LFV processes and asymmetries
K. Inami Future prospect for t LFV PDG2006 Belle Babar • Possible sensitivity at 5ab-1 based on eff. and NBG of most sensitive analysis Estimated upper limit range of Br
K. Inami Future prospect • Br~O(10-9) at Super B factory
K. Inami Physics impact • Physics reach for SUSY parameters • tmg • tmh • After observation! • To specify the model, • Angular correlation • Muon polarization, etc.
n t n t W H- s s u u T.Morozumi Tau physics Direct CPV in t-->K-pn CPV in forward-backward asymmetry
To do • Finish sensitivity studies • start sensitivity studies for new modes • put them into a global picture Revised “SuperKEKB physics book” by the end of February 2007. Publication in spring 2007 (physics reports).
General Mixing Framework K. Okumura J. Park
SUSY GUT Models T. Goto N. Maekawa
Major Achievements Expected at SuperKEKB Case 1: All Consistent with Kobayashi-Maskawa Theory Search for New CP-Violating Phase in bgs with 1 degree precision CKM Angle Measurements with 1 degree precision Discovery of BgKnn Discovery of Bgmn Discovery of New Subatmic Particles Discovery of T Violation in BgLpp sin2qW with O(10-4) precision |Vub| with 5% Precision Observations with U(5S), U(3S) etc. Discovery of BgDtn Discovery of CP Violation in Charged B Decays “Discovery” with sigfinicance > 5s Discovery of Direct CP Violation in B0gKp Decays (2005) Discovery of CP Violation in Neutral B Meson System (2001)
Major Achievements Expected at SuperKEKB Case 1: All Consistent with Kobayashi-Maskawa Theory Case 2: New Physics with Extended Flavor Structure Search for New CP-Violating Phase in bgs with 1 degree precision Discovery of Lepton Flavor Violation intgmgDecays# CKM Angle Measurements with 1 degree precision Discovery of BgKnn Discovery of Bgmn Discovery of New Right-Handed Current in bgs Transitions # Discovery of New Subatmic Particles Discovery of T Violation in BgLpp Discovery of New CP Violation inB0gfK0Decays# sin2qW with O(10-4) precision |Vub| with 5% Precision Observations with U(5S), U(3S) etc. Discovery of BgDtn Discovery of CP Violation in Charged B Decays “Discovery” with sigfinicance > 5s Discovery of Direct CP Violation in B0gKp Decays (2005) # SUSY GUT with gluino mass = 600GeV, tanb = 30 Discovery of CP Violation in Neutral B Meson System (2001)
Comparison of Super-B and LHCb No other experiment can compete for New Physics reach in the quark sector. SuperKEKB 5ab-1 50ab-1 LHCb 2fb-1
Beyond the SM New CP violation, Lepton Number Violation Can be discovered anytime Big question of quark flavor physics 1) What does the flavor structure of TeV new physics look like ? (How does it taste ?) Experiment-driven
Is there flavor symmetry yet to be discovered ? The number of free parameters < 10 relation between CKM and masses !!
Big question of quark flavor physics 1) What does the flavor structure of TeV new physics look like ? (How does it taste ?) Subquestions 1-1) Are there new CP-violating phases ? 1-2) Are there new right-handed currents ? 1-3) Are there effects from new Higgs fields ? 1-4) Are there new flavor violation ? 1-1) tCPV in B0gfK0, h’K0, KsKsKs 1-2) (t)CPV in b g sg 1-3) B gtn, mn, Dtn 1-4) tgmg Big question of quark flavor physics 2) Is there flavor symmetry yet to be discovered ? Unitarity triangle with 1% precision
Goals of BNM2 • Answers to questions/homework at BNM1 • Wrap-up reports on SuperKEKB physics • Close-to-the-final figures, numbers for physics book • Present further new ideas • Further brain-storming • Enjoy our stay in Nara !