Search

The Super Cryogenic Dark Matter Search experiment (SuperCDMS) at the Soudan Underground Laboratory studied energy loss associated with Frenkel defect formation in germanium crystals at mK temperatures using in situ $^{210}$Pb sources. We examine the spectrum of $^{206}$Pb nuclear recoils near its expected 103 keV endpoint energy and determine an energy loss of $\left(6.08\pm0.18\right)$ %, which we attribute to defect formation. From this result and using TRIM simulations, we extract the first experimentally determined average displacement threshold energy of $\left(19.7^{+0.6}_{-0.5}\right)$ eV for germanium. This has implications for the analysis thresholds of future germanium-based dark matter searches., 4 Figures, Two data files, One data release description file

The Advanced Scientific Computing Advisory Committee (ASCAC) was charged to form a standing subcommittee to review the Department of Energy’s Office of Scientific and Technical Information (OSTI) and to begin by assessing the quality and effectiveness of OSTI’s recent and current products and services and to comment on its mission and future directions in the rapidly changing environment for scientific publication and data. The Committee met with OSTI staff and reviewed available products, services and other materials. This report summaries their initial findings and recommendations.

After a brief introduction to the muon anomalous magnetic moment, the current status of the ( g − 2) µ measurement is given. The three standard deviations of discrepancy between a µ calculations and the direct measurement by the E821 experiment at the Brookhaven National Laboratory (USA) calls for more precise measurements of the e + e − hadronic cross section. This article contains a not inclusive review of the main results and the state of the art on the hadronic cross section measurements from BABAR and other experiments.

The most recent results on CP and T violation from the BABAR and Belle Collaborations are reported in the following. Time reversal symmetry violatio n in weak decays is measured by the BABAR experiment for the first time in the B meson system with great precision, providing an independent verification of the CP symmetry violation as well. The Belle experiment provides a constraint on the CPT symmetry. Both Collaborations show their results in the measurement of the Unitary Triangle angles. The angle β (or φ1) is measured using the B → D ∗ D ∗ decays. The measurement of the angle α (or φ2) is obtained by BABAR from B → ρπ decays and by Belle from B → ρρ and B → ππ. The Collaborations also present the combined value of the angle γ (or φ3) based on previous measurements and a new technique to extract φ3 via Dalitz analysis. BABAR shows a measurement of CP violation in B 0 meson mixing. The results shown, unless stated otherwise, are obtained on the full datasets of the B-factories.

We present a search for the $B^- \to K^- \nu{\overline{\nu}}$ , $B^- \to \tau^- \overline{\nu}$ and $B^- \to \mu^-\overline{\nu}$ decays in a data sample of 82 fb–1 collected at the Υ(4S) resonance with the Babar detector at the SLAC PEP-II asymmetric B Factory. We find no evidence of signal for such decays and for all of them we set a 90% C.L. upper limit. For the $B^- \to K^-\nu{\overline{\nu}}$ decay we set a 90% C.L. upper limit of ${\cal B}(B^- \to K^-\nu{\overline{\nu}}) < 7.0 \times 10^{-5}$ . For the $B^ \to \tau^-\overline{\nu}$ decay we set a 90% C.L. upper limit of ${\cal B} (B^- \to \tau^-{\overline{\nu}}) < 4.1 \times 10^{-4}$ . For the $B^- \to \mu^-\overline{\nu}$ decay we set a 90% C.L. upper limit of ${\cal B}(B^- \to \mu^-{\overline{\nu}}) < 6.6 \times 10^{-6}$ . All results are preliminary. PACS: e+e– collisions – Rare B meson decays

The present contribution summarizes some results from the BaBar and Belle collaborations on the following categories of rare decays: Radiative decays Leptonic decays Hadronic rare decays will not be treated in this contribution.

We present a search for the B- → τ- v-bar decay in a data sample of 82 fb- collected at the Υ (4S) resonance with the BABAR detector at the SLAC PEP-II asymmetric B Factory. Continuum and combinatorial backgrounds are suppressed by selecting a sample of events with one completely reconstructed B. The decay products of the other B in the event are analyzed to search for a B- → τ- v-bar decay. The τ lepton is identified in the following decay channels: τ- → e - νν-bar τ- → {mu}- {nu}{bar {nu}}, {tau}-{yields} {pi}- {yields} {pi}-{pi}{sup 0}{nu}, τ- {yields} {pi}{sup -}{pi}{sup +}{pi}- {nu}. We find no evidence for a signal and set a 90% C.L. upper limit of B(B{sup -} {yields} τ{sup -}{bar {nu}}) < 7.7 x 10-4. We combine this result with another BABAR measurement searching for B-{yields} τ-} ν-bar decays in a sample with one B meson reconstructed in semi-leptonic channels. The two samples are statistically independent. We obtain a combined 90% C.L. upper limit of B(B- → τ-ν-bar) < 4.1 x 10-4. All results are preliminary.

This report, based on the Dark Sectors workshop at SLAC in April 2016, summarizes the scientific importance of searches for dark sector dark matter and forces at masses beneath the weak-scale, the status of this broad international field, the important milestones motivating future exploration, and promising experimental opportunities to reach these milestones over the next 5-10 years., 66 pages, 15 figures, 3 tables. Workshop website and agenda: http://www-conf.slac.stanford.edu/darksectors2016/ https://indico.cern.ch/event/507783/ Editors: J. Alexander, M. Battaglieri, B. Echenard, R. Essig, M. Graham, E. Izaguirre, J. Jaros, G. Krnjaic, J. Mardon, D. Morrissey, T. Nelson, M. Perelstein, M. Pyle, A. Ritz, P. Schuster, B. Shuve, N. Toro, R. Van De Water