CLASSE: LEPP Journal Club

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LEPP Journal Club

Spring 2007

Date Speaker  Institution Title & Abstract Hosts
01/16/2007 (SP) Freya Blekman Imperial College, London High-multiplicity Top Physics at the Tevatron Anders Ryd
01/26/2007 John Hauptman Iowa State "The 4th Concept detector for the International Linear Collider"
A small group is now designing a new detector for e+e- physics at a future linear collider, involving new ideas in TPCs, calorimetry, muon systems, and machine-detector interface.. Our goal is to design, at least at this conceptual stage, the "best detector in high energy physics".

Deb Mohapatra
01/29/2007 (SP) Lorentz Agostino CERN Electron and Photon energy calibration and high level trigger in CMS experiment Anders Ryd
02/02/2007 Mike Pennington University of Durham/JLAB "What heavy flavor decays can teach us about light meson physics and what you need to know about light quark dynamics to extract useful information from heavy flavor decays"

Abstract: A key window on physics beyond the Standard Model is provided by heavy flavor decays and the precision measurement of the CKM matrix elements. However, the underlying weak interaction is largely obscured by strong final state interactions. Consequently, we have to understand the light quark dynamics involved if we are to extract precise information from heavy flavor decays. How to do this will be reviewed.

Deb Mohapatra
02/09/2007 Steven Robertson MCGILL U "Searching for New Physics in leptonic and radiative decays with BABAR"
Rare decay processes, which are suppressed or forbidden within the Standard Model, can have rates or other observables which are significantly modified by contributions from "New Physics". Thus, these processes are sensitive probes of a variety of scenarios of New Physics at energy scales well beyond the electroweak scale. In this talk I will present recent results of searches for rare leptonic and electroweak flavour-changing neutral-current decays of B mesons, as well as lepton flavour violating tau decays, from the BABAR experiment at SLAC. I will also discuss some of the implications for possible physics beyond the Standard Model which result from these measurements and the prospects for future measurements from B factories. .
Anders Ryd
02/12/2007 (SP) Ilaria Segoni TBA Jim Alexander
03/02/2007 Ivan Bazarov Cornell Univ "The birth of a future light source in Wilson basement"
With decades of successful CESR running for high energy physics coming to an end, LEPP physicists have begun looking beyond Ithaca by getting involved in experiments and machine design of large international projects such as LHC and ILC. In the meantime, the Wilson lab is bracing towards the transition to a dedicated light source facility in the course of several years. The landscape of existing and envisioned light sources worldwide, which I will paint, reflects a vibrant and competitive environment of synchrotron radiation science community: the new low emittance storage rings continue to push the envelope of x-ray brightness, while the free electron lasers seek to realize the long-awaited goal of achieving lasing at Angstrom wavelength. Cornell seeks to enter this arena as a leader by developing and operating the next generation light source on campus. The key part to this bet is a construction of a very high brightness & intensity electron photoinjector that is now being commissioned in the basement of Wilson building. I will seek to communicate the inspiration behind the project, summarize the aspirations from R&D now in progress, and convey some of the perspiration that occurs in the process of pushing the state-of-the-art in several dimensions as the lab develops a new class of particle accelerators.
Deb Mohapatra
03/09/2007 Steven Blusk Syracuse Univ "The Search for New Physics in B Decays at LHCb"
The speaker will give an introduction to the CKM mechanism for CP Violation and give an overview of what has been learned by the B factories. The speaker will then discuss LHCb, an experiment designed to search for new physics in decays of B mesons.
Deb Mohapatra
03/16/2007 John M. LoSecco University of Notre Dame "The Search for the Neutrino theta_13" Rich Galik
03/23/2007 Stefan Funk SLAC "The quest for Gamma-rays from Cosmic Accelerators with GLAST and HESS." David Cassel
03/26/2007 (SP) Victor Veszpremi Purdue Univ Search for the Standard Model Higgs Boson in the Missing Et and b-jets Signature at CDF
04/06/2007 Matthew John Charles University of Iowa "New D-mixing results from BaBar "
There have been several exciting new results in charm physics recently. The main focus of the talk will be a preliminary study of 384 fb-1 of BABAR data in which we see evidence for mixing in D0 decays to K+ pi-. I will touch on other new results in charm mixing and spectroscopy as time allows.
Anders Ryd
04/13/2007 Richard Wigmans Texas Tech University "DREAM Calorimeter"
High-precision jet spectroscopy will be increasingly important in future high-energy accelerator experiments, particularly at a Linear e+e. Collider. In this talk, I will present recent results of the DREAM (Dual REAdout Method) project, in which we have built and tested a novel type of calorimeter that seems to be well suited for this task. The key aspect of this detector is the simultaneous measurement of the scintillation light and the .Cerenkov light generated in the shower development process. By comparing these two signals (which are provided by different types of optical fibers), the electromagnetic shower fraction can be measured event by event, both for single hadrons and for jets. Fluctuations in this fraction are the dominant contribution to the hadronic energy resolution. They are also responsible for the signal non-linearity and the non-Gaussian response function typical for hadron calorimeters. The dual-readout technique makes it possible to eliminate the effects of these fluctuations. As a result, the DREAM calorimeter has impressive performance characteristics. A comparison of the two signals also reveals interesting details about the shower development process. I will also discuss application of the DREAM principles in homogeneous calorimeters, which has the potential of providing ultimate calorimeter performance. Recent results of beam tests of a crystal electromagnetic calorimeter backed up by the fiber detector mentioned above will be presented.
Jim Alexander
04/19/2007 (Special JC 12:00 PM) Sven Heinemeyer CERN "The LHC/ILC Connection"
The LHC will start data taking next year. The planned International Linear Collider (ILC) could start operations in the second half of this decade. In all investigated physics scenarios the ILC can contribute substantially. Besides the complementarity of both machines, several physics questions can only be answered in a combined analysis of the data of the LHC and the ILC. Important examples, including results from the LHC/ILC workshop taking place at Fermilab, are discussed.
Jim Alexander
04/20/2007 Colin Jessop Notre Dame "Physics with electrons or photons at CMS" Lawrence Gibbons