UCSD Participation in Ba Bar Vivek Sharma University

UCSD Participation in Ba. Bar Vivek Sharma University of California, San Diego DOE Site Review 2005 1

Luminosity ! r The CP Detecto at PEP-II ring BREAKING NEWS ! 2

Ba. Bar Collects 1034 Luminosity From PEP-II !! Touched 1034 instant. lumi again at 22: 30, 9 th Oct 3

Cumulative Luminosity RUN 5 RUN 4 RUN 3 RUN 2 RUN 1 4

Detector Prepared for Higher Peak luminosity Background conditions reliably extrapolated based on beam currents & luminosity 1. 5 T solenoid DIRC (PID) 144 quartz bars 11000 PMs e (9 Ge. V) Instrumented Flux Return Iron / Resistive Plate Chambers or Limited Streamer Tubes (muon / neutral hadrons) EMC 6580 Cs. I(Tl) crystals e+ (3. 1 Ge. V) Drift Chamber 40 layers Silicon Vertex Tracker 5 layers, double sided strips All other systems fully capable of highest luminosities 5

IFR Replacement of RPC with LST: Crucial Upgrade For ID Now: Barrel LSTs Now: Barrel RPCs Bottom & top sextants installed summer 2004 Remaining sextants in summer 2006 6

Ba. Bar’s Physics Productivity Journal Papers BABAR Belle < 2003 32 54 2003 39 28 2004 52 35 June 2005 53 32 Total 176 149 BABAR Belle Papers submitted to ICHEP 04 72 63 Abstracts submitted to LP 05 75 73 Conference Contributions 7

Summary of UCSD Roles on BABAR • • • Commissioning Detector – Survey PEP-II machine conditions prior to Ba. Bar installation – pull together all elements of the SVT hardware, electronics & data-acquisition software required to operate an SVT module during PEP II commissioning Drift Chamber operations – Hardware & software systems available early 1998 for commissioning – Core online software, trigger, other system development – Participation essential for continuation of existing long-term leading role on the project Tracking & core software development – Key element to early & successful physics CP violation program – Built on considerable experience in tracking software for PIs and direct participation in DCH project – core software contributions & calibration efforts for DCH Collaboration management – Near-term operations and long-term planning and development CP violation and B physics program ! 8

The UCSD Team on BABAR Past Postdocs • Gerhard Raven (May 1998 -May 2002) – Led DCH effort on calibration infrastructure, t-to-d extraction, tracking software & core offline software tools – Tracking Coordinator for BABAR offline reconstruction (May 1999 -May 2000) – Co-convener of hadronic mixing AWG (Sep 2000 -Jun 2003) – Now at NIKHEF • Riccardo Faccini (Apr 1998 -Mar 2002) – Worked on DCH calibration algorithms & DCH data analysis – Leading contributor to vertex and composition tools design & implementation, micro-DST databases structure – Convener for Charmonium AWG (Fall 1999 -present) and Coordinator for sin 2 analysis effort (Apr 2000 -2002) – Now Assist. Professor at Rome, current Ba. Bar Analysis coordinator 9

The UCSD Team on BABAR • • Sören Prell (Oct 1999 -Aug 2002) – Developed & maintained main fitting tools of sin 2 and B 0 mixing measurements, including all related studies of reliability and sensitivity to systematic error sources – Leading effort on DCH t-to-d calibration studies and improvements, including resolution (Aug 2000 -present); DCH Operations Manager (Jul-Dec 2001) – Now Assist. Professor at Iowa State Shahram Rahatlou (Oct 2002 -Jan 2005) – Reconstruction Manager for Ba. Bar offline software – Software czar for Breco analysis working group common software – Measurement of B D(*)0 K(*)0 modes sensitive to sin 2 +g – Now Assist. Professor at Univ. of Rome Present Postdoc • Daniele del Re (Jan 2003 -present) – Leader/liaison for software migration of Breco AWG to the CM 2 (2003 -04) – Co-convener Breco AWG (July 2004 -Present), Recoil side Physics WG Coord. – Leading role in Vub measurements with Breco sample and CM 2 implementation – Transitioning to CMS to fulfill urgent UCSD need • Search in progress for Rahatlou replacement; identified strong candidate 10

The UCSD Team on BABAR Graduate Students • Shahram Rahatlou (Sep 1998 -Oct 2002) – Worked on micro-DST database, composition tools, Monte Carlo support for analysis, and first B meson reconstruction – Wrote, supported and documented BReco. User analysis package, including production of skimmed ntuples, main support role for sin 2 and mixing, essential for determinations of mistag rates – Online DAQ operations manager from Aug 2000 -Feb 2001 – Main Ph. D. student on sin 2 measurement • Haleh Hadavand (Sep 1999 -present) – 5 th-year Ph. D. student, full-time research at SLAC – Involved in DCH calibration work and DAQ online manager – Produced B+/B 0 production ratio measurement; instrumental in refining KS efficiency understanding – Time-dependent CP violation in Penguin mode – expect to finish by end 2005 11

The UCSD Team on BABAR • Edward Hill (Sep 1999 -present) – 5 th-year Ph. D. student, full-time research at SLAC – Involved in DCH calibration work and DAQ online manager – Thesis on precise measurements of Vub using fully reconstructed Breco Sample ; expect finish in next six months Other Major Roles • David Mac. Farlane: DCH System Manager (1995 -2000); Publications Board Chair (Nov 1999 -Nov 2001); Executive Board member (Jun 2001 -Oct 2003); Chair, Long-Term Upgrade Task Force (Feb 2002 -Jan 2003); Spokesperson (Sep 2004 -present). Plans to move on to SLAC • Vivek Sharma: SVT liaison for Com. Det, Speakers Bureau Chair (Jun 2000 Jun 2001); Founder & Co-convener of Breco AWG (Sep 1999 -Sep 2004), Publications Board (Oct 2002 -Sep 2005) 12

Recent Ba. Bar Results where UCSD Physicists Have Played Important Roles Focus on measurements defining Or Testing The Unitarity Triangle 13

Over-Constraining The Unitarity Triangle measure UT angles by measuring CP violating asymmetry in B decay measure UT sides by measuring B semileptonic and radiative decay rates Measure both ! Angles and Sides 14

CP Violation in B 0 System CPV through interference between mixing and decay amplitudes Directly related to CKM angles for single decay amplitude For single amplitude 15

Cartoon of (4 S) B 0 Evolution & Decay 16

sin 2 From b ccs is Now a Precision Measurement sin 2 from these final states belongs to a special class of definitive measurements in particle physics • Theoretical uncertainties << 1%, so its interpretation is clear • data-driven measurement, statistics limited, with very little dependence on simulation or theoretical assumptions. UCSD group played leading role in defining sin 2 and similar time-dependent CPV measurement in Ba. Bar, analyses(based on our method) now gets updated routinely following each major growth in data sample 17

Prize For Best Ph. D Dissertation At a US University or Laboratory 2004 Mitsuyoshi Tanaka Dissertation Award to Shahram Rahatlou University of California, San Diego Citation: "For his role in the development of the tools needed for the analysis of B factory data, including the t. FIT program, a unique and comprehensive fitting framework for time-dependent analyses. The tools he developed played a key role in the observation of CP violation in the B system by the Ba. Bar collaboration. These tools will be essential to the ongoing program of work as the B factories continue to probe the origins of CP violation. " Ph. D Thesis Advisor : Vivek Sharma 18

sin 2 from B cc K 0 227 M BB B (cc) KS (CP odd) modes B J/ψ KL (CP even) mode asymmetry is opposite! sin 2 = 0. 722 0. 040 (stat) 0. 023 (sys) PRL 94, 161803 (2005), 19 (hep-ex/0408127)

Evolution of sin 2 measurements First precise test of the CKM picture, has led to a paradigm shift Look now for corrections rather than alternatives to CKM ansatz Present WA Present CKM fit 20

Probing The CKM Angle : “Dodging Penguins” UCSD Role: VS & DBM (with Jawahery, Hocker) = Review Comm Uncommon analysis (VS) Complete immersion in analysis for over 2 years 21

CKM Angle and Penguin “Pollution” • Original hope was to measure from TD CPV in B 0 + Neglecting Penguin diagram T P 22

Recent Breakthrough: CKM Angle From CPV in B 0 + - BABAR 23

Constraints On Dominated By B 0 + BABAR only Mirror solutions disfavored People can do unimaginable things with good quality data samples! RC: VS, DBM, Jawahery, Hocker 24

Probing The CKM Angle : Clean Modes Are Rare UCSD Role: B- DK- analyses developed in Breco AWG under guidance of conveners VS (2003 -4) and del Re (2005) B D 0 K 0 analysis authored by Rahatlou & VS 25

CP Asymmetry In B DK Decay Look for B decays with 2 amplitudes with relative weak phase Relative strength of the two B decay amplitudes matters for interference 0. 1 -0. 3 Want rb to be large to get more interference Large CP asymmetry 26

from B± D 0 K±: D 0 KS + - Dalitz Analysis Schematic view of the interference 2 27

B D 0 K ; D 0 KS + - Dalitz Plot Distributions B+ D 0 K+ Differences between B+ and B plots signify direct CP violation. Analyses STATISTICS limited B+ D 0 K+ B D 0 K 28

: BABAR and Belle results (Dalitz method) Observable BABAR (+stat+sys+model) Belle (+stat+sys+model) r. B (D 0 K) r. B (D*0 K) r. B (D 0 K*) non-K* direct CP significance r. B value controls the CPV not well measured so far (degrees) 0. 1 0. 2 The error on is very sensitive to the value of r. B 29

0 0 Prospects For sin(2 + ) with B /B D • • Interference between decay and mixing Advantages: • Expected large asymmetries (*)0 K (*)0 Strong phase difference • Time-dependent measurement with K 0 KS • Probe r. B in self-tagging final state K*0 K-p+ – Disadvantages: • Color suppressed decays: Smaller (x 50) branching fractions than Ks • Analysis is data starved ! 30

N 104 ± 14 K 0 Yields and Rates D 0 Sidebands Ba. Bar Comb. /0. 01 Ge. V * E(Ge. V) D 0 Sidebands N 17 ± 5 Comb. /0. 01 Ge. V B D (*)0 E(Ge. V) 205 million BB Preliminary Mode BF (10 -5) B 0 D 0 K 0 5. 3 ± 0. 7 ± 0. 3(syst) B 0 D*0 K 0 3. 6 ± 1. 2 ± 0. 3(syst) Signal yields are as expected Shahram Rahatlou Vivek Sharma 31

Probing r. B From Self-Tagging B 0 D 0 K*0 & B 0 D 0 K*0 Vcb transition Ba. Bar Vub transition N=77 ± 13 E (Ge. V) Mode E (Ge. V) B. F. (in 10 -5) B 0 D 0 K*0 4. 0 ± 0. 7 ± 0. 3(syst) B 0 D 0 K*0 -0. 5 0. 3(syst) <0. 24 @ 90% CL 205 million BB Preliminary 32

Unitarity Triangle from CP Violation Measurements Alone New B Factory milestone: Comparable UT precision from CPV in B decays alone Overconstrained: subsets of measurements can be used to test for new physics 33

Probing New Physics Contribution to CP Violation Via “Penguin” Loops in B Decays << Testing Vs “ ” >> New Physics ? SM Standard Model UCSD contribution: CPV in clean B 0 KS KS KS ; H. Hadavand Thesis 34

Compare sin 2 with “sin 2 ” from CPV in Penguin decays of B 0 Both decays dominated by single weak phase Tree: Penguin: New Physics? 3 ? Must be if one amplitude dominates 35

Haleh Hadavand Thesis K 0 s B 0 K 0 s 36

Summary of “ Penguin” Vs : Summer 2005 Charmonium s-Penguins 2. 4 between CP violation in s-penguin vs sin 2 (cc) About 0. 5 loss vs Winter 2005 due to shift in charmonium average (new Belle value lower than previously) 37

How Good is The SM prediction For Penguin Modes? 2 -body: Beneke, PLB 620 (2005) 143 Calculations within framework of QCD factorization Haleh’s mode very clean ! 3 -body: Cheng, Chua & Soni, hep-ph/0506268 Theory suggest > 0, opposite to exptal observation Tantalizing at present Need more data to clarify ! 38

• Crucial measurements of sides of UT require digging out tiny signal from normally overwhelming background. Examples are – b u l for Vub measurement – b s and b d for |Vtd/Vts| measurement • Spinoff from sin 2 project Algorithm for reconstructing massive samples ( 4000/fb-1) of fully reconstructed B mesons • Use knowledge of kinematics of fully reconstructed B to study decay of recoiling B in (4 S) B B p BReco Breco e. D* Xu e+ n l Brecoil Daniele del Re Recoil Side Physics : A UCSD Innovation 39

Measurement of |Vub| from Inclusive Semileptonic Decays Ba. Bar data used in Aneesh’s |Vcb| analysis derived using the recoil side physics method 40

Inclusive Semileptonic Decays: The Big Picture Inclusive El spectrum Rate b ul Shape |Vxb|2 El[Ge. V] Inclusive Mx spectrum (log-scale) Shape Rate for Mx<1. 55 41

Recoil Side Measurement of b ul Kinematics Good Example of Recoil-side physics D* p Xu Can now “Reconstruct” Neutrino 3 -vector, q 2 Brecoil Y(4 S) l n Reco side Recoil side D* p n B Y(4 s) missing mass squared Xu l B Y(4 s) B Candidate Mass • MX reconstruction • Kinematic constraints to improve MX resolution 42

q 2 (Ge. V 2) Isolating b u l From Dominant (x 50) b c l background signal region b c b u misreco b u m. X (Ge. V) theory Analysis sensitivity (Stat. vs Theory error) optimized for present sample Good to reach ~ 6% theory precision with x 3 -4 data samples 43

Bottomline on Vub From Inclusive Measurements The Recoil side method has the best potential for precise measurement of |Vub| with larger data samples + b s data Ba. Bar measurements led by Daniele del Re & Ed Hill (thesis) 44

The Emerging Big Picture With improved Measurements of |Vub| Overconstrained: growing set of independent measurements are remarkably consistent with CKM picture 45

Integrated Luminosity [fb-1] Ba. Bar Projection For Data Sample Growth Double again from 2006 to 2008 ICHEP 08 Double from 2004 to 2006 ICHEP 04 46

Future Activities of UCSD-Ba. Bar Group • • • Since Ba. Bar’s beginning, UCSD PIs, post-docs and students have led Ba. Bar’s productivity Mac. Farlane’s stated move to SLAC in Jan 2006 diminishes UCSD’s current high profile role in Ba. Bar management and participation in Ba. Bar beyond 2008 Does not significantly alter UCSD’s ability on near term (2008) physics objectives which are based on our long term investments in : – Precise measurement of Vub from fully reconstructed B sample using recoil side technique pioneered by UCSD – Search for b u amplitude in B 0 D 0 K 0 family of decays in pursuit of angle – CPV in b s Penguin decays as clean barometer of NP Each of these measurements have a well defined & vetted analysis procedure in place (analysis method published already) but are each currently STATISTICS limited. In 2006, plan to shrink the UCSD-Ba. Bar group to – 50% of VS (other 50% directed to CMS) ; – One full time post-doc concentrating on physics analyses above – retain possibility of one graduate student doing Ba. Bar analysis and then moving to CMS DAQ in ~2008 Yet deliver on the physics goals stated above assuming projected luminosity profile 47

Local Organizers Ben Grinstein, Aneesh Manohar, Frank Wuerthwein, VS Thanks for generously supporting the CKM 2005 workshop at UCSD • Essentially six workshops within a workshop + satellite meetings • Meeting attracted best of the best (~ 230 in all) • Lively discussions of new Expt. and theory ideas for future precision • Important service to the global Heavy Flavor Physics community 48

Unused Slides 49

Ranking Penguin Modes by SM “pollution” f SM Pollution f Bronze Semi. Gold Decay amplitude of interest Naive (dimensional) uncertainties on sin 2 Note that within QCD Factorization these uncertainties turn out to be much smaller ! 50

Outline of This Talk • Brief status of PEP-II and Ba. Bar • UCSD Participation in Ba. Bar • Recent Ba. Bar physics results highlighting UCSD contribution – Probing the Unitarity Triangle with Ba. Bar • angles and • CKM element Vub – Anticipated Ba. Bar data samples (2008) – UCSD physics goals with Incoming Ba. Bar Data • UCSD Physics goals clearly formulated • Analysis methods well established, statistics limited • Straightforward analysis of ever-increasing Ba. Bar data samples • Thank you for generously supporting the CKM 2005 workshop at UCSD – Meeting attracted the best of the best (~ 220 in all) – Lively discussions of new exptal and theory ideas for high precision – Rated unqualified success by the Heavy Flavor Physics community 51

Drift Chamber Electronics Upgrade • Motivation: – Remove anticipated deadtime problem due to serialization and shipping of data from DCH to readout module • Upgrade in two steps: – Phase 1 (summer 2004) • Ship only 1/2 ADC waveform information (32 16 bytes) from front ends • No impact on d. E/dx performance – Phase 2 (Oct 2005) • Larger FPGA to allow feature extraction before transmission • New boards produced, tested & ready for installation 52

Reminder Of The Terminology * Vud. Vub * Vtd. Vtb * Vcd. Vcb 53

Ba. Bar Physics Highlights: Discovery of Direct CPV in B Decays B f 2 B 0 K+ B BABAR f 2 BABAR First Observation (4. 2 s) Belle Confirms at ICHEP 04 3. 9 s B 0 K + 4. 2 CPV signal enhanced Average 54

Physics Analysis Focus of The UCSD-Ba. Bar Group UCSD-Babar group led the measurements of sin 2 from B charmonium modes between 1998 -2003. These measurement has now become “routine”. UCSD group has moved on more challenging measurements. With the large data set Ba. Bar is accumulating our major physics focus is now on: – Search for the decay B 0 D 0 K 0 and measurement of CKM angle by time-dependent CP asymmetry. – Developing massive samples of fully reconstructed B mesons for Recoil side B meson decay studies. The aim is to measure CKM element Vub from inclusive and exclusive b u l decays – Probe CP violation in Penguin decays such as – Measurement of production ratio Brief Description of UCSD analysis follows 55

UCSD Physics Activities On Babar • David Mac. Farlane (PI): – Main author of Ba. Bar 2002 Phys. Rev. (D) on Measurement of B oscillation and CP violation. – Measurement of inclusive b u l spectrum (with Student Ed Hill) – Search for Time-dependent CP asymmetry in B 0 KS KS KS (with student Haleh Hadavand) – Measurement of production ratio Hadavand) (with student Haleh – Ba. Bar Spokesperson 56

UCSD Physics Activities On Babar • Vivek Sharma (PI) : – led, as co-convener, the Ba. Bar physics group on Exclusive B decays to Open charm ( BRECO group) between 1999 –July 2004. All analyses involving exclusive hadronic B Charm reconstruction are developed in this group. Guided thru publication 9 PRL, 2 PR(D)RC and 2 PR(D) articles and multiple conference papers including 11 papers at ICHEP 04 in Beijing. • Physics goals of the BRECO group include: – exploration of decay modes capable of measuring CKM angle and sin 2+ – Decay dynamics in hadronic B decays to charm – Spectroscopy of new charm mesons from their production in B decays – Develop large sample of fully reconstructed B mesons for measuring inclusive properties of the recoiling B meson. This paradigm shifting enterprise is already contributing to several key measurements in B decays such as Vub and measurement of photon spectrum in b s decays. • Breco group oversees the physics analysis of about 80 Ba. Bar physicists from US, France, Italy and Germany. It is one of the largest analysis groups in Babar. – Guiding role in Ba. Bar observation of CP violation (sin 2 ) in B J/ K 0. Main author of the 2001 and 2002 PRLs on measurement of Sin 2 – Member (since 2002) of the Babar Publication Board. 57

UCSD Physics Activities On Babar • Shahram Rahatlou (Post-doc): – Major contributions to Ba. Bar observation of CP violation in B decays to charmonium (e. g. B J/ K 0). Tools and samples he developed (Breco. User, t. FIT etc) are still used in many CP violation studies. Awarded The 2004 APS Tanaka prize for the best Ph. D thesis at a US university or Laboratory. – Ba. Bar Event Reconstruction Manager since Jan 1, 2004. • The reco manager is Responsible for development and deployment of the common aspects of reconstruction, including the reconstruction geometry & alignment calibration model & code, the overall organization of reconstruction executables, and the reco infrastructure packages. He is responsible for the system-specific aspects of the reconstruction code to the level desired by the specific system managers. The reco manager is responsible for the technical aspects of the reco software within the five systems and their integration into the whole. • Shahram brings a unique and comprehensive knowledge of Babar analysis tools, computing and physics to this job. His leadership has been crucial in ensuring prompt and high quality event reconstruction and allowed Ba. Bar to analyze the data collected till the end of Run 4 in mid July and present results based on it at the Beijing ICHEP 04 in mid-August ! – Developing the time-dependent CP asymmetry analysis of B 0 D 0 K 0 for measurement of sin 2 + and . First results presented at ICHEP 04 (hepex/0408052 ). 58

UCSD Physics Activities On Babar • Daniele del. Re (Post-doc): – Primary physicist in the development of large sample of fully reconstructed hadronic B decay (Semi-exclusive B sample). – Co-convener of the “Recoil Side Physics” forum in Ba. Bar in charge of coordinating and assisting in the development of a variety of inclusive measurements in the decay of the B meson recoiling against the fully reconstructed B meson (in the semiexclusive sample). – Led the pioneering measurement of Vub by measuring the hadronic mass spectrum in b u l from the recoil side B. Results published in PRL (92) 07180, 2004. Updated Vub results with more data (x 3) and improved observables in preparation. – Key contributor in the migration of Ba. Bar analysis software to the new computing model implemented since September 2003. Technical coordinator of the data and MC “skims” and tagbits for the Breco and Semileptonic Physics groups. – Appointed co-convener of the Breco Physics group in August 2004. 59

UCSD Physics Activities On Babar • Haleh Hadavand (Ph. D. Student): – Member of Ba. Bar charge Particle tracking group with important contributions to the Drift chamber calibration and Ks reconstruction studies. Her tracking efficiency studies provide the official Ba. Bar “recipes” for all analyses involving branching fraction measurements. – Primary author of the measurement of the B+/B 0 production ratio from the (4 s) Meson using B+ J/ K+ and B 0 J/ Ks decays to be published in Phys. Rev. (D). – Primary author of the measurement of time-dependent CP asymmetry in penguin dominated mode B 0 KS KS KS. • Edward Hill (Ph. D Student): – Drift chamber calibration. – Migration of Ba. Bar analysis software related to Semi-leptonic decay physics to the new computing model and data-mining for the entire semi-leptonic physics group. – Developed algorithms for b cl background rejection for Semileptonic physics group – Measurement of Vub from inclusive semi-leptonic decay using the photon energy spectrum from b s decays. 60

r Self-Tagging B 0 D 0 K*0 and limit on B Charge correlation to separate B 0 from B 0 124 million BB Vcb transition N=45 ± 9 Vub transition No Signal in Vub mediated Decay Preliminary Mode BF (10 -5) 0 0 B D K 6. 2 ± 1. 4 ± 0. 6 *0 0 0 B D K < 4. 1 @ 90% *0 Results based on more data and refined analysis technique forthcoming; targeted for 61 publication in early 2005.

Measurement of | Vub | From Inclusive and Exclusive Final States New Idea: Measurement of |Vub| From Semileptonic B Decays recoiling against (large samples of) Fully Recostructed B mesons Capitalizes on UCSD Expertise in B meson Reconstruction (Breco Samples Semi. Excl Samples) 62

Beginning of an Experimental Paradigm Shift in Vxb Measurements in Semileptonic Decays at B Factories • Hermiticity, so vital for SL measurements is not the best feature of Belle/ Babar detectors due to intrusion of machine into detector • But B-factory detectors recording ever increasing samples of BB pairs (> 250 Million BB recorded already 1000 Million soon) – At the price of modest efficiency (4%), can fully reconstruct one B decay into all hadronic final states (Breco) and examine the other (recoiling) B decay • This “Recoil side” studies perfectly suited for many Vxb studies • Much “cleaner” and more powerful than neutrino reconstruction a la CLEO • This is the most promising way for the future Vub and other Semileptonic measurements 63

The Perfect (4 S) Event: Example of Recoil Side Analysis In this (rare) case all particles were sprayed within fiducial volume of detector Replace this with your Favourite Vxb mode e. g: b u l 64

Hadronic B Decay Reconstruction Rate: 4000/ fb-1 80 fb-1 World’s largest sample of Fully reconstructed B mesons 1, 000 and growing! Full B reconstruction on one side provides kinematic constraints and Background reduction allowing Important inclusive B decay Measurements like Vub. S/B~0. 3 Require Lepton (p*>1. 0 Ge. V) S/B~2. 5 Largely the work of UCSD postdoc Daniele del. Re 65

Exclusive Final States: B (p, r, w) l Approach similar to the inclusive analysis but In resonances are exclusively and fully reconstructed on recoil side. We measure, very cleanly and over large kinematic range: B± p 0 ln B 0 r ln B± r 0 ln B 0 wln Breco Sample As Lattice calculations become more robust, measurement of B l rate over large kinematic range may lead to one of the best measure Vub precisely. Experimental measurement is statistics limited 66

Haleh Hadavand David Mac. Farlane Accepted in PR(D) RC 67

CPV In Pure s-Penguin Decay B 0 KS KS KS - y x KS + + ~30 mm ~4 mm KS + K 0 s KS - ~200 mm K 0 s Beam Inflated Beam 90 10 signal after bkgnd subtraction • • • Hadavand • • New probe of CPV in s-penguin decays, clean signal Perform Ks and B vertexing using 5 layer Silicon tracker (technique pioneered by Ba. Bar and tested on B Ks 0 sample). Often one of three Ks decays inside SVT. Reconstructed B vertex resolution sufficient for timedependent CPV measurement a la B J/ KS First analysis of its kind, currently “blind”, expect public results and publication by early 2005. CPV precision expected to be statistics limited, will improve with rapidly accumulating Ba. Bar data 68

UCSD-Babar Physics Outlook Golden years of Babar physics productivity enabled by excellent PEP-II running and success of the new Babar computing model • UCSD-Babar physicists continue to play a key role in Ba. Bar productivity by contributing to physics and computing leadership, service tasks and by performing outstanding and topical analyses. • The UCSD-Babar group’s planned near-term physics focus is on – Strategies for measurement of , particularly B 0/B 0 D(*)0 K(*)0 – Determination of |Vub| with the novel recoil side method • • Inclusive b ul measurements • Exclusive b ul final states (exploring new ideas such as that of Grinstein & Pirjol hep-ph/0404250 ) – Innovative new probe of CPV in s-penguin modes with B 0 KSKSKS 69

CP Violating Asymmetry From Interference Between Mixing &Decay phase in B mixing 1 decay amplitude, |q/p|=1: 1 decay amp: magnitude & strong phase divide out! 70

Time Dependent CP Violation in Picture z U(4 S) = 0. 55 Separate B 0 and B 0 K B 0 Coherent BB pair B 0 J/ Ks 71