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B A B AR & Dark Matter

B A B AR & Dark Matter. Masahiro Morii Harvard University LPPC. B A B AR Experiment. Operation completed in 2008, with 531 fb -1 data on tape Y 4S data contains 454 million BB events 445 publications submitted Analyses continue for a few more years Harvard joined B A B AR in 2000

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B A B AR & Dark Matter

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  1. BABAR & Dark Matter Masahiro Morii Harvard University LPPC

  2. BABAR Experiment • Operation completed in 2008, with 531 fb-1 data on tape • Y4S data contains 454 million BB events • 445 publications submitted • Analyses continue for a few more years • Harvard joined BABAR in 2000 • Currentandpastmembers Faculty: Masahiro Morii (PI) George Brandenburg➔ ATLAS Postdocs: Stephen Bailey ➔ LPNHE ParisEunil Won ➔ Korea UniversityJinwei Wu➔ Finances Students: Corry LeeKris Chaisanguanthum ➔ UCSF Undergrads: Ben Smith ➔ Harvard (ATLAS), Kevin Chan ➔ BerkeleyKevin Weil ➔ Stanford, Mark Bandstra ➔ Berkeley BABAR + Dark Matter

  3. Harvard BABAR Group • Level-1 Trigger upgrade project (2000–2004) • Fast 3-d track reconstruction to reject beam-related backgrounds • Purpose-built electronics (Z-pT Discriminator) uses state-of-art FPGAs to process 10 Gb/s data from the drift chamber and reconstruct tracks in 2 μs • Delivered the full system in 2004 • Physics Analysis (2003–today) • Semileptonic B decays • Morii and Chaisanguanthum: B → πlν (to extract |Vub|) • Quasi-2-body B decays • Wu: CP violation in B0 → ρπ (angle α), B0 →f0KS(angle β) • Bailey and Lee: Branching fraction of B → η(’)K* • Lee: Branching fraction of B → ρK* BABAR + Dark Matter

  4. BABAR Publications by Harvard BABAR + Dark Matter

  5. B → ρK* Analysis • B → ρρ is a sensitive probe for the CKM angle α • Uncertainty on α depends on the penguin contribution • Penguin-dominated B0 → ρ0ρ0 is very small • Idea: Use B → ρK* to constrain the penguin in B → ρρ • Linked by SU(3), and the penguin diagram in B → ρK* is CKM-favored • Corry Lee’s Ph.D. analysis • Will measure B0 → ρ+K*−, B0 → ρ0K*0, and B+ → ρ0K*+ • Red modes will likely be the first observations • Publish with B+ → ρ+K*0 analysis by Saclay • Has experience from similar analyses (η(’)K*, η(’)ρ) in BABAR • Analysis will complete by winter • All data and MC samples in hand. Fit has been fully tested on MC • Results will be presented at spring 2011 conferences • Lee Ph.D. expected in May 2011 BABAR + Dark Matter

  6. LUX Experiment DAMA • LUX is a 350 kg (100 kg fiducial) liquid Xe experiment • Located in the Davis cavern, Sanford Underground Lab in Homestake, SD • Uses the two-phase Xe technologydeveloped by XENON10 to reachσ(WIMP-p) = 5x10-46 cm2 • Combines scintillation and ionizationsignals to suppress backgrounds • Significant discovery potential • Focus-point SUSY models predictσ(WIMP-p) ~ 10-44 cm2 XENON10 XENON100 CDMSII XENON100 SuperCDMS LUX BABAR + Dark Matter

  7. Harvard LUX Group preamp • Harvard joined LUX in June 2009 • Morii (PI) and Michał Własenko (postdoc) • Supported by University funds • Took up a critical-path item: post-amplifier • 120 channels of receiver-amplifier-shaper for the PMT signals • Morii, Własenko + John Oliver, Meghna Kundoor of the LPPCelectronics shop PMT postamp FADC Digital Trigger Analog Trigger BABAR + Dark Matter

  8. Harvard LUX Group • Postamps have been delivered to Sanford • Własenko is developing online software • Real-time data-quality monitoring system — Distributed database with web-based UI allows data-quality checks from anywhere • User interface for the detector-control system • Morii focuses on R&D for next-gen LZ experiments • Analog electronics will be Harvard responsibility • PMT development in collaboration with Brown and Hamamatsu • Currently supported by the university funds • Proposal to add Dark Matter to the LPPC is pending • Morii would be 50% LUX, 50% ATLAS • Asking for supporting 1/2 of a graduate student BABAR + Dark Matter

  9. Status of LUX • LUX detector is assembled and deployed in a surface building • Exact duplicate of the undergroundlayout except for the smaller (3 m)water tank • Detector integration in progress • Cool down planned in October • Will run the detector on surface • Exercise all systems • Collect cosmic ray and sourcecalibration data • Detector will be moved as-is into Davis Cavern • Expected in summer 2011 BABAR + Dark Matter

  10. Future Plans • LUX will run in 2011–2012 • LUX + ZEPLIN  LZ • LZS = LUX scaled to 1.5 ton • LUX infrastructure designed to accommodate LZS • Target 2014–2015 operation • σχN = 2x10-47 cm2 in 2 years • LZD = 20 ton concept • Will need a deeper site, possibly DUSEL 8000 feet • Target 2017–2020 operation • σχN = 10-48 cm2 in 3 years LUX 300 days LZS 500 days LZD 1000 days BABAR + Dark Matter

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