DPF 2009

Session

Low Energy Searches for New Physics I

30 Jul 2009, 14:00

Wayne State University

441. Probing light hidden sectors via the U(1) portal

Dr Adam Ritz (U of Victoria)

30/07/2009, 14:00

Low Energy Searches for BSM Physics

Abstract: I will discuss some of the motivations for considering new physics in a hidden sector, which interacts with the Standard Model via light GeV-scale mediators. For example, this sector may naturally contain a dark matter candidate. The focus will be on experimental probes of the light mediators, primarily through the vector portal - where a secluded U(1) sector kinetically...

376. Search for the Rare Decay Kl->pi0nunubar at E391a Experiment

Jiasen Ma (The University of Chicago)

30/07/2009, 14:30

Low Energy Searches for BSM Physics

The E391a experiment at the KEK 12 GeV proton synchrotron is the first dedicated experiment for the Kl->pi0nunubar decay. The data is taken during three separate Runs. We just performed a blind analysis on the last Run. With (3.48+-0.25)*10^9 Klong decays, we found no candidate events. An upper limit of 6.8*10^-8 was set on the branching ratio for the decay at the 90% confidence level.

411. The K0TO Experiment

Dr Monica Tecchio (University of Michigan)

30/07/2009, 15:00

Low Energy Searches for BSM Physics

The goal of the K0TO experiment at J-Parc is to discover and measure the rate of the rare decay of the neutral KL into pi0 nu nubar . This flavor changing neutral current decay proceeds through second-order weak interactions. Other, as yet undiscovered particles, which can mediate the decay could provide an enhancement to the branching ratio, which in the Standard Model predicted...

402. Measuring the BR(K+->pi+nu nubar) with the NA62 experiment at CERN

Dr Giulio Saracino (Univ. Degli Studi di Napoli Federico II)

30/07/2009, 15:30

Low Energy Searches for BSM Physics

The NA62 experiment is designed to measure the BR of the very rare kaon decay K+->pi+nu nubar collecting order 100 events with 10% of background in two years of data taking. The poor current experimental knowledge of this decay, based on 7 events collected by the E787/949 experiments, from one side, and the good theoretical prediction on the other side, make this new measurement very...

427. Search for KL -> pi0 pi0 μ+μ− with KTeV data

Leo Bellantoni (Fermilab)

30/07/2009, 16:30

Low Energy Searches for BSM Physics

This presentation will report on the first experimental search for KL -> pi0 pi0 μ+μ− based on data collected by the KTeV Experiment at the Fermi National Accelerator Laboratory in Batavia, Illinois. Although this decay mode is possible within the Standard Model the rate is suppressed by the very limited phase space. The HyperCP Experiment has recently observed three Sigma+ -> p+μ+μ− events...

120. A Search for Invisible Decay of the Y(1S)

Yury Kolomensky (UC Berkeley/LBNL)

30/07/2009, 16:55

Low Energy Searches for BSM Physics

The nature of dark matter is a challenge to both astrophysics and collider physics. Dark matter may have both heavy and light constituents, much like the normal matter described by the Standard Model. We present a search for decay of the Y(1S) meson into undetectable final states, using a sample of 98 million Y(3S) mesons collected at the PEP-II/BaBar B-factory. We tag the decay of the...

100. Measurement of Upsilon(1S) --> l+l- and Test of Lepton Universality

Elisa Guido (University & INFN Genova)

30/07/2009, 17:20

Low Energy Searches for BSM Physics

Using a sample of 122 million Upsilon(3S) decays collected with the BaBar detector at the PEP-II asymmetric energy collider at the Stanford Linear Accelerator Center, we measure the ratio R = BR(Upsilon(1S) --> tautau)/BR(Upsilon(1S) --> mumu); the measurement is intended as a test of the lepton universality and as a possible search for a light pseudoscalar Higgs boson in...