Bulletin of the American Physical Society
APS April Meeting 2012
Volume 57, Number 3
Saturday–Tuesday, March 31–April 3 2012; Atlanta, Georgia
Session B2: Invited Session: Rare Decays |
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Sponsoring Units: DPF Chair: Kevin Pitts, University of Illinois at Urbana-Champaign Room: Regency Ballroom V |
Saturday, March 31, 2012 10:45AM - 11:09AM |
B2.00001: Latest results from the MEG experiment Invited Speaker: Toshiyuki Iwamoto The MEG experiment, which searches for a lepton flavor violating muon decay, $\mu^{+} \rightarrow e^{+} \gamma$, to explore new physics like supersymmetric grand unification, has started physics run since 2008 at Paul Scherrer Institute in Switzerland. Its innovative detector system, which consists of a 900 liter liquid xenon scintillation photon detector with 846 2 inch photomultiplier tubes and a positron spectrometer with a superconducting magnet, drift chamber, and timing counter, enables orders of magnitude better sensitivity than previous experiments. By using physics data collected in 2009 and 2010, we set a new 90\% C.L. upper limit of 2.4$\times10^{-12}$ on the branching ratio of the $\mu^{+} \rightarrow e^{+} \gamma$ decay, which is the most stringent limit on the existence of this decay to date. The current status of the experiment as well as the latest results will be presented. [Preview Abstract] |
Saturday, March 31, 2012 11:09AM - 11:33AM |
B2.00002: The KOTO Experiment at J-PARC Invited Speaker: Jiasen Ma The KOTO experiment is a neutral Kaon rare decay experiment at J-PARC. It is designed with major upgrades from the pilot experiment E391a at KEK-PS. The primary goal is to measure the branching ratio of the decay KL$\rightarrow \pi 0 \nu \bar{\nu}$. The decay KL$\rightarrow \pi 0 \nu \bar{\nu}$ is of particular interest because it is a pure direct CP violating process and its branching ratio has been calculated with less than one percent of theoretical uncertainty. It is very sensitive to the new physics, particularly the CP violation in the quark sector. A precision measurement will pin the CP-phase of the CKM matrix and test the Standard Model and beyond. The SM prediction is 2.4 $\times 10^{-11}$. A vast new physics parameter phase space is still viable with the current KL$\rightarrow \pi 0 \nu \bar{\nu}$ branching ratio direct limit $<$2.6 $\times 10^{-8}$ set by E391a. I will report the challenge, approach and status of the experiment. [Preview Abstract] |
Saturday, March 31, 2012 11:33AM - 11:57AM |
B2.00003: Rare b decays and CP violation at the Tevatron Invited Speaker: Luciano Ristori The experiments at the Tevatron, CDF and D0, have access to one of the world's largest samples of charm and beauty hadrons decays. These provide information competitive and complementary to that from dedicated flavor facilities. With the analysis of the full Run II data sample, this successful program has now reached its maturity. I review recent Tevatron flavor physics results, focusing on those that are specifically sensitive to departures from the Standard Model, such as searches for rare B decays, measurements of CP-violation in charm, and bottom-strange decays. [Preview Abstract] |
Saturday, March 31, 2012 11:57AM - 12:33PM |
B2.00004: Rare decays at LHCb Invited Speaker: Alessio Sarti Heavy flavour hadrons decays that proceed through FCNC loops or CKM suppressed diagrams are highly sensitive probes of possible deviations from the Standard Model predictions, and hence can be used to indirectly constrain or reveal New Physics contributions. The LHCb experiment at LHC has access to several important observables that include: the branching ratio of $B_{(s,d)}\rightarrow\mu^+\mu^-$, $D^0\rightarrow\mu^+\mu^-$ and $\tau^{+/-} \rightarrow \mu^+\mu^-\mu^{+/-}$, the angular distributions in the decay $B^0\rightarrow K^*\mu^+\mu^-$ and the lifetime distribution of $B_s\rightarrow\phi \gamma$. Results on some of these studies and related topics will be reported, using the first inverse femtobarn of data collected during the 2010 and 2011 LHC run (L = 1 fb$^{-1}$, $\sim$300 [$\sim$6000] billions of produced b [c] pairs). With such data sample LHCb, having already achieved the world's best sensitivity to the $B_s \rightarrow \mu^+\mu^-$ decay, will be able to explore a regime where many models of New Physics predict a signal, and make futher steps down towards the measurement of the Standard Model value for the branching ratio. [Preview Abstract] |
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