CLASSE: LEPP Journal Club

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CORNELL LABORATORY FOR ACCELERATOR-BASED SCIENCES AND EDUCATION

Seminars take place at Newman 311, 4pm (refreshments at 3:45pm), unless announced otherwise.
Fall 2004
Where we are now
Abstracts and Transparencies
DATE SPEAKER INSTITUTION SEMINAR TITLE
Thu Sep 9 1:30 Sheldon Stone Syracuse BTeV

Fri Sep 17 Nikolay Achasov Sobolev Institute, Novosibirsk Non-Heavy-Quark Decay of Heavy Vector Resonances

Fri Sep 24 Maury Tigner Cornell Linear Collider Technology Choice and Next Steps

Fri Oct 1 Vivek Jain BNL B Physics at D0: An Update

Wed Oct 6 1:30 Bob Cousins, Dan Green, Daniela Bortoletto UCLA, FNAL, Purdue The CMS Experiment at the CERN LHC

Fri Oct 8 Alain Bellerive Carleton What can we learn about neutrinos at SNOLAB

Tue Oct 12 1:30 Michael Tuts, Howard Gordon Columbia, BNL The Physics ATLAS is Aiming to Discover

Fri Oct 15 --- NO JOURNAL CLUB -- CLEO Meeting

Fri Oct 22 Nicolas Berger SLAC BaBar ventures into the non B-physics world : Hadronic physics with ISR and Pentaquark searches

Fri Oct 29 3:00 pm Henry Tye Cornell Searching for Cosmic Strings

Fri Nov 5 Séamus Davis Cornell Newly discovered Electronic Crystal State in High-Tc Cuprates: Charge-ordered Insulator or Electronic Supersolid?

Thu Nov 11 Aaron Roodman SLAC Exploring Penguins: Gluon Loop Diagrams at BABAR

Fri Nov 19 (Richard Hughes) (Ohio State) RESCHEDULED TO FEB 11

Fri Nov 26 --- NO JOURNAL CLUB -- Thanksgiving

Fri Dec 3 2:00 pm Vladimir Savinov Pittsburgh The Search for New Physics in ATLAS Blind Analysis

Fri Dec 10 Stan Wojcicki Stanford Long baseline neutrino physics at Fermilab: present and future

Spring 2005

DATE SPEAKER INSTITUTION SEMINAR TITLE
Fri Jan 21 Kamal Benslama Columbia A Selection of Exotics with ATLAS

Fri Jan 28 Steve Kahn Stanford The Large Synoptic Survey Telescope (LSST)

Wed Feb 2 Julia Thom Fermilab Physics with Lepton Pairs at the CDF Experiment

Fri Feb 4 --- NO JOURNAL CLUB -- CLEO Meeting

Tue Feb 8 Andrei Gritsan LBNL B Meson Decays to Vector Particles: a New Window on Fundamental Interactions

Fri Feb 11 Ben Kilminster Ohio State Upgrading the Track Trigger at CDF for High Instantaneous Luminosity

Wed Feb 16 Eva Halkiadakis Rochester Precision electroweak and top quark measurements at the energy frontier

Fri Feb 18 Tony Readhead Caltech The Cosmic Background Imager (CBI)

Wed Feb 23, Wilson Large Chris Hill UC Santa Barbara New Physics: A View from the Top

Fri Feb 25 Christos Touramanis University of Liverpool Alpha and Gamma Measurement from Rhopi, RhoRho and DK decays in BaBar

Mon Feb 28, 2:30 pm Peter Wittich U. of Pennsylvania Measuring Top Quark Cross section with Dilepton Events

Fri Mar 4 --- NO JOURNAL CLUB -- CLEO Meeting

Fri Mar 11 Daniel Kim SUNY Upstate Medical University Radiation Oncology Physics from a HEP-ex Reference Frame

Fri Mar 18 Kate Scholberg Duke Recent Results from Super-Kamiokande

Fri Mar 25 --- NO JOURNAL CLUB -- Cornell Spring Break

Fri Apr 1 Jeff Berryhill UCSB Semileptonic, Leptonic and Radiative Decays from BaBar

Fri Apr 8 --- NO JOURNAL CLUB -- CLEO Meeting

Fri Apr 15 (Tom Kinoshita) (Cornell) RESCHEDULED TO MAY 27

Fri Apr 22 Chris Walter Duke Super-K, K2K and T2K: The Present and Future

Fri Apr 29, 3:00 PM Charlie Baltay Yale SNAP

Fri May 6, Wilson Commons, 3:00 PM Ted Barnes U. of Tennessee Exotics and Excited Charmonia at CLEO: Past lessons and new predictions

Fri May 13 Brian Foster Oxford Heavy-quark production at HERA

Tue May 17 Tim Gershon Tokyo University Measurement of f3 at Belle, and How CLEO-c Can Help

Thu May 19 Peter Kulinich MIT The PHOBOS detector at RHIC

Fri May 20, 2:00 PM Cheng-Ju Lin Fermilab Search for the Flavor-Changing Neutral Current Decays Bs(d)-->m+ m- at CDF

Tue May 24 Xiaonan Li Illinois Inst. of Tech. BTeV Level 1 Trigger and BES-II DAQ System

Fri May 27 Tom Kinoshita Cornell Theory of Lepton g-2: Recent Improvement of QED Terms

Fri Jun 17 Lauren Hsu LBNL Update on KamLAND: Spectral Distortions, Geoneutrinos and More

Fri Jul 15 Andreas Kronfeld Fermilab Predictive Lattice QCD

Fri Aug 19 Steve Gottlieb Indiana University Lattice QCD Comes of Age

Abstracts and Transparencies

September 9
Sheldon Stone, Syracuse University
BTeV
pdf

September 17
Nikolay Achasov, Sobolev Institute, Novosibirsk, Russia
Non-Heavy-Quark Decay of Heavy Vector Resonances
The branching ratios of the decays of the states psi(3770) and Y(10580) into pi+pi-, KKbar, omega eta, omega eta', K*Kbar + c.c., rho+rho-, K*K*bar are evaluated. They proceed via real intermediate states DDbar and BBbar respectively. The sum of calculated branching ratios is 4x10^-3 and 5x10^-3, respectively, assuming the quark-antiquark content of psi(3770) and Y(10580). The cited values exceed corresponding three-gluon branching ratios by an order of magnitude. pdf (Other talks during this visit: Lunch talk September 14, J/psi transitions: photon vs. gluon)

September 24
Maury Tigner, Cornell University
Linear Collider Technology Choice and Next Steps
The work of the international technology recommendation panel will be reviewed and the next steps towards design of the International Linear Collider, ILC, will be outlined. doc1, doc2, see also Barry Barish's presentation for the ITRP

October 1
Vivek Jain, BNL
B Physics at D0: An Update
Since the start of Run II of the Fermilab Tevatron, the upgraded D0 has collected close to 500 pb^-1 of of data. Using this data we are exploring the b-quark sector, especially those topics which are not accessible at the e^+e^- B-factories, e.g., study of Bs mixing, beauty baryons, searches for rare B decays, measurements of the various B hadron lifetimes, B meson spectroscopy, B_c, Upsilon states, etc. This talk reviews the current status of the D0 B physics program and prospects for future measurements. ppt

October 6
Dan Green, FNAL, Bob Cousins, UCLA, and Daniela Bortoletto, Purdue
The CMS Experiment at the CERN LHC
ppt1, pdf1, ppt2, pdf2

October 8
Alain Bellerive, Carleton University
What can we learn about neutrinos at SNOLAB!?
ppt, pdf

October 12
Howard Gordon, BNL and Michael Tuts, Columbia
The Physics ATLAS is Aiming to Discover
The two large detectors for the Large Hadron Collider, ATLAS and CMS, are designed slightly differently but are aiming at the same physics discoveries: the source of electroweak symmetry breaking, the search for large extra dimensions, and/or hopefully something that has been not been imagined. ATLAS has an excellent calorimeter and a large air core toroid system for triggering and measuring muons even without the inner tracker. We discuss the ATLAS discovery potential and outline some areas where Cornell could make significant contributions. Some examples are in physics analysis, computing resources, upgrade R&D and the trigger. ppt, pdf

October 22
Nicolas Berger, SLAC
BaBar Ventures into the non B-physics World : R from ISR and Pentaquark Searches
Although better known for its B-physics results, the BaBar collaboration is also making significant contibutions to other domains of hadronic physics. This talk reviews two such topics : the measurement of hadronic cross-sections using initial-state radiation and inclusive searches for pentaquark states. Concerning ISR, recent BaBar measurements for the cross-section and J/Psi parameters in the 3pi channels will be presented, as well as a selection of other exclusive final states and an a status report for an inclusive analysis. Concerning pentaquarks, the talk will report the results of inclusive searches for Theta+, Xi-- and other light-quark pentaquark states. ppt, pdf

October 29
Henry Tye, Cornell University
Searching for Cosmic Strings
Realization of the inflationary universe in string theory suggests that cosmic strings may be present in our universe. This opens an observational window to superstring theory. Ways to detect such cosmic strings is reviewed. pdf, Keynote Zip file

November 5
Séamus Davis, Cornell University
Newly discovered Electronic Crystal State in High-Tc Cuprates: Charge-ordered Insulator or Electronic Supersolid?

High temperature superconductivity appears upon strong hole-doping of the CuO2 crystal planes in the cuprates. But, at low hole-densities, many other unprecedented electronic phenomena are also observed. A 'hidden' electronic state in the mysterious 'pseudogap regime' of the phase diagram at low hole-doping, has been proposed to explain this situation.

Scanning tunneling microscopy (STM) studies have played a key role in the search for this state. They reveal that destruction of superconductivity in Bi2Sr2CaCu2O8 (Bi-2122), whether by high magnetic fields (1), by exceeding the critical temperature Tc (2), or by strong underdoping (3), results in a very similar set of effects. These include a checkerboard pattern of quasi-periodic electronic structure modulations (with periods between 4a0 and 5a0). But underdoped Bi-2212 has such strong crystal and electronic disorder at the nanoscale (3,4), that the identity of any 'hidden' electronic state is difficult to discern.

Instead, we recently began STM studies of a different cuprate material Ca2-xNaxCuO2Cl2. It is a beautifully simple crystal with only one CuO2 plane in the unit cell and an undistorted crystal structure. Wavefunction imaging STM studies immediately revealed an unprecedented 4a0X4a0 'checkerboard' electronic crystal state (5).

I will describe a series of experiments which we have carried out to study the characteristics of this 'checkerboard' state. I will then discuss proposals for the identity of this state, ranging from a charge-ordered insulator to a bosonic 2e supersolid, along with their implication for high-Tc superconductivity.

(1) J. E. Hoffman et al , Science 295, 466 (2002).
(2) M. Vershinin et al ,Science 303, 1995 (2004).
(3) K. McElroy et al , Cond/mat 0404005.
(4) K.M. Lang et al , Nature 415, 412 (2002).
(5) T. Hanaguri et al , Nature 430, 1001 (2004).

November 11
Aaron Roodman, SLAC
Exploring Penguins: Gluon Loop Diagrams at BABAR
pdf

December 3
Vladimir Savinov, Pittsburgh
The Search for New Physics in ATLAS Blind Analysis
Last year half a million MC events were simulated on ATLAS for the first Blind Analysis exercise. This sample mainly composed of various SM backgrounds but also had some new, non-SM physics processes hidden in it. A number of ATLAS collaborators searched for these New Physics processes. Two students and I also searched for this hidden content - starting from scratch - without any prior experience with TeV scale physics and ATLAS physics software. I will present the results of our findings and what we learned about the physics at LHC energies in the course of this exciting research project. pdf

December 10
Stan Wojcicki, Stanford
Long baseline neutrino physics at Fermilab: present and future
ppt

January 21
Kamal Benslama, Columbia
A Selection of Exotics with ATLAS
The considerable center-of-mass energy and luminosity at the LHC will ensure a discovery reach for new particles which extends well into the multi-TeV region. ATLAS has carried out many studies of the implications of this capability for Beyond the Standard Model physics. In this talk, I will focus on studies involving Extra-Dimensions, Little Higgs, Strong Symmetry Breaking, Compositeness and new Gauge Bosons. I will also discuss the US contributions to these activities and present some preliminary physics studies involving the initial layout detector. pdf, grad student lunch talk

January 28
Steve Kahn, Stanford
The Large Synoptic Survey Telescope (LSST)
ppt

February 02
Julia Thom, Fermilab
Physics with Lepton Pairs at the CDF Experiment
ps

February 08
Andrei Gritsan, LBNL
B Meson Decays to Vector Particles: a New Window on Fundamental Interactions
Fundamental particles and their interactions are the necessary building blocks in understanding our Universe, its existence and evolution. B-factory experiments produce abundant samples of B mesons to study fundamental interactions. CP-violation measurements can be represented on the "Unitarity Triangle." One angle of the triangle is now known to about 5%. The best measurements for the second angle were expected to come from the simple decay of a B meson into two pions. Instead, the best measurements have come from the decay of B mesons into a pair of spin-one resonances, B->rho rho. Another decay to a pair of vector mesons, B->phi K* is found to have polarization not consistent with expectations. Could this be a sign of New Physics? This opens a completely new approach to CP violation studies and search for new fundamental interactions. pdf

February 11
Ben Kilminster, Ohio State
Upgrading the Track Trigger at CDF for High Instantaneous Luminosity
Due to the large number of interactions per beam crossing at the Tevatron, and the need to preserve both high Pt top, electroweak, and exotics physics as well as low Pt b physics, the Extremely Fast Track trigger (XFT) at the CDF experiment is being upgraded to reject tracks by using 3-D tracking information and higher resolution timing. The new system, which will be installed and tested with minimal interference with the current system, allows CDF to continue recording quality data even with luminosities producing 10 interactions per bunch crossing. ppt, pdf

February 16
Eva Halkiadakis, Rochester
Precision electroweak and top quark measurements at the energy frontier
The W and Z bosons, the top quark, and the yet-to-be-discovered Higgs boson are the most massive particles in the Standard Model. W and Z boson measurements are significant probes of the Standard Model and the prediction of the Higgs boson mass hinges on the precise measurements of the W boson and top quark masses. I will review the status of a few electroweak and top quark measurements from the CDF collaboration from the ongoing Run II of the Tevatron at Fermilab. pdf

February 23
Chris Hill, UC Santa Barbara
New Physics: A View from the Top.
Ten years after its discovery, the top quark remains the focus of a substantial research effort at the currently operating Tevatron experiments. This is because the top quark, with its large relative mass, plays a particularly important role in the Standard Model and many extensions to it. Many top quark measurements now being performed at the Tevatron are thus sensitive to new physics. Indeed, this is true of my own recent work which I will present. In particular, I will discuss a measurement of the top production cross-section in the dilepton final state performed at CDF, directly sensitive to a several supersymmetric hypotheses. I will also discuss measurements of the mass of the top quark which are indirectly sensitive to Higgs physics, highlighting a new technique which I have developed that employs the mean decay length of the b-hadrons from the top's decay to infer its mass. pdf

February 25
Christos Touramanis, University of Liverpool
Alpha and Gamma Measurement from Rhopi, RhoRho and DK decays in BaBar
pdf

February 28
Peter Wittich, U. of Pennsylvania
Measuring Top Quark Cross section with Dilepton Events
Almost ten years ago, the top quark was discovered at the Tevatron collider at Fermilab. With the small samples acquired at that time, we knew little about the top quark except that it is surprisingly massive. Now, we are entering a stage where we are able to study this quark with large samples and precision measurements. I describe one of the first such measurements performed at CDF, the production of top quark pairs that decay into events with two leptons in the final state. pdf, ppt

March 11
Daniel Kim, SUNY Upstate Medical University
Radiation Oncology Physics from a HEP-ex Reference Frame

The major technical goal of the medical specialty of radiation oncology is spatial optimization of dE/dx deposited inside the human body from incident particles, in order to biologically destroy diseased tissue. About 2/3 of the medical physicists in the U.S. are hospital employees in radiation oncology, their primary responsibilty being to ensure the accuracy and robustness of radiotherapy systems, processes, and individual patient treatments. The first part of this talk will provide an overview of the current state of radiation oncology and the physicist's role therein; the second part will describe two projects in digital image processing and computer hardware that have been developed and implemented by the speaker at University Hospital in Syracuse. Connections to HEP will be emphasized.

The Grad Student Pizza Lunch will focus on career and professional topics, including books and ideas that the speaker found to be useful in thinking about what to do after graduation, and the many transitions involved with changing from HEP to MeP.

March 18
Kate Scholberg, Duke University
Recent Results from Super-Kamiokande
I will review the latest atmospheric neutrino oscillation results from Super-K and put them in the context of what is now known about neutrino mass and oscillations. I will then briefly discuss prospects for the next generation "T2K" (Tokai-to-Kamioka) long baseline oscillation experiment. pdf

April 1
Jeff Berryhill, UCSB
Semileptonic, Leptonic and Radiative Decays from BaBar
ppt

April 22
Chris Walter, Duke University
Super-K, K2K and T2K: The Present and Future
In this talk I will review the latest atmospheric neutrino oscillation results from the Super-Kamiokande experiment, and also the latest results from the K2K long-baseline neutrino oscillation experiment. I will discuss the compatibility of the neutrino mixing parameters determined in the two experiments. Finally, I will address remaining open questions in neutrino oscillation physics, and the techniques we will use to address them in the next-generation T2K long-baseline experiment.

May 6
Ted Barnes, U. of Tennessee
Exotics and Excited Charmonia at CLEO: Past lessons and new predictions
ppt

May 13
Brian Foster, Oxford
Heavy-quark production at HERA
The HERA accelerator produces copious numbers of charm and beauty quarks, which can be used to study both heavy quark spectroscopy and production mechanisms, taking advantage of the fact that HERA exhibits aspects both of a hadron-hadron and a photon-hadron collider. I will review the results from HERA I, the prospects at the upgraded HERA-II, and look at some of the first results from the HERA-II running. ppt

May 17
Tim Gershon, Tokyo University
Measurement of f3 at Belle, and How CLEO-c Can Help
The Belle experiment at the KEK-B asymmetric-energy e+e- collider has accumulated a large sample of U(4S)->BBbar events, and the taking of much more data is anticipated. One of the main objectives of the experiment is the precise measurement of the angles of the CKM Unitarity Triangle. I will present the status of the program to measure the angle f3 (also known as g), and discuss how this will evolve with more data, emphasising the crucial role of measurements from CLEO-c. pdf, ps.gz

May 19
Peter Kulinich, MIT
The PHOBOS detector at RHIC
Setup designed for basic study of heavy ion collisions at RHIC will be described. Its main components utilize silicon pad detectors with analog read-out. DAQ system with 50MB/s bandwidth was built using RACEway switching fabric. New method of track reconstruction for heavy conditions will be discussed. pdf, sxi

May 20
Cheng-Ju Lin, Fermilab
Search for the Flavor-Changing Neutral Current Decays Bs(d)-->m+ m- at CDF
The flavor-changing neutral current decay Bs(d)-->m+ m- is one of the most sensitive probes to physics beyond the Standard Model. The predicted branching ratio in the Standard Model is on the order of 10^-9; beyond the sensitivity of the current experiments. However, in many extensions of the Standard Model, the branching ratio is naturally enhanced by one to three orders of magnitude and thus would be observable at the Tevatron. In this talk, I will present the latest CDF analysis searching for Bs(d)-->m+ m- decays, which yields the most stringent upper bounds on these braching fractions to date. pdf

May 24
Xiaonan Li, Illinois Institute of Technology
BTeV Level 1 Trigger and BES-II DAQ System
BTeV experiment was proposed to build a forward collide detector at the Fermilab Tevatron dedicated to study a broad range of B decays with high precision. It was planned to begin data taking in 2009. Unfortunately, BTeV experiment was terminated in February of 2005. BTeV three-level trigger system was designed to support its physical goal. An important feature of BTeV trigger system is Level 1 trigger which performs track and vertex reconstruction for every bunch crossing and search for evidence of B decays with high efficiency. This talk will focus on the BTeV Level 1 trigger, its technical baseline design and some R&D projects.

In addition, the talk will also describe DAQ system briefly for BES- II experiment at BEPC, Beijing. ppt

May 27
Tom Kinoshita, Cornell University
Theory of Lepton g-2: Recent Improvement of QED Terms
At present precision of g-2 measurement is 0.5 ppm for muon and 0.004 ppm for electron. Although the QED $\alpha^4$ term is known more precisely than experiment right now, it will become necessary to know the $\alpha^5$ term some day, especially since Gabrielse will anounce a new g-2 value of electron shortly. Evaluation of the $\alpha^5$ term involves 9080 Feynman diagrams for muon ( actually for $a_\mu - a_e$) and 12672 for mass-independent part of $a_e$. I will discuss preliminary result for muon and work in progress for electron. pdf

June 17
Lauren Hsu, LBNL
Update on KamLAND: Spectral Distortions, Geoneutrinos and More
I will present results from KamLAND that have been released in the past year. My main focus will be on the second reactor anti-neutrino analysis and its impact on our current understanding of the neutrino mixing parameters. I will briefly discuss a second measurement that has been released recently, the application of KamLAND towards measuring geological sources of anti-neutrinos. Finally, I will discuss the future of KamLAND as a reactor anti-neutrino experiment and plans for an ambitious purification project that will enable KamLAND to detect Be7 solar neutrinos. ppt

July 15
Andreas Kronfeld, Fermilab
Predictive Lattice QCD
Recent progress in lattice QCD suggests that realistic calculations are now possible. I present three results (form factors in semileptonic D decays, the "decay constant" in leptonic D decay, and the mass of the B_c meson) of quantities that were not yet well measured when the calculations were finished, and compare them to measurements made since. pdf

August 19
Steve Gottlieb, U. of Indiana
Lattice QCD Comes of Age
The Nobel Prize was recently awarded to David Gross, David Politzer and Frank Wilczek for the discovery that QCD is asymptotically free. This property enables us to use perturbation theory to study the theory in the high energy regime. However, many of the interesting properties of quarks and QCD, like confinement and flavor mixing, require a nonperturbative understanding of QCD.

In 1975, Ken Wilson established a nonperturbative approach to QCD using a space-time grid or lattice. Recent advances in the formulation of lattice QCD and in computer power have allowed significant advances. Some recent calculations and their implications will be described. We will also consider what further progress can be expected in the next few years. pdf

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