Registered Presentations for NP99 July 8-10 1999

Konstantin Anikeev, MIT
CDF, Talk: Time of Flight System for CDF II at Fermilab
Abstract: Brief description of the ToF system is given. Place of the system as a part of CDF II detector is discussed as well as the impact on the possible Run II results is reviewed. Second part of the talk is a short overview of my work as a member of CDF ToF project along with some recent results.

Leonard Apanasevich, Michigan State University
E706, Talk:$k_T$ Effects in High-$p_T$ Particle Production

Abstract: Recent results from the E706 collaboration on the production of high-$p_T$ particles and high-mass pairs of particles illustrate the importance of initial-state parton transverse momentum ($k_T$) effects in comparisons of pQCD predictions with data. Incorporating these effects in a phenomenological $k_T$-smearing model successfully describes data at both fixed target and collider energies
Leonard Apanasevich, Michigan State University
E706, poster: High-$p_T$ Direct-Photons and $\textstyle \pi^{0}$'s at E706

Cristian Boffo, University of Udine
Technical Division, Poster : Magnetization Measurements of Superconducting Strands
Abstract: Magnetization is an important property of superconductors. An integrating coil magnetometer was designed and built in order to obtain the hysteresis curve of NbTi and Nb3Sn multifilamentary strands. Together with critical current measurements, this measure completes the characterization of superconductors by yielding the effective filament diameter and the AC losses.

Sarah Case, Columbia University
BooNE, Talk : Neutral Heavy Leptons at the BooNE detector
Abstract: Neutral Heavy Leptons (NHLs) are theoretical particles outside the standard model that are coupled to neutrinos. Signals that could represent NHLs have been observed at the KARMEN experiment, and it is possible for BooNE, a neutrino oscillation experiment recently approved at Fermilab, to also detect NHLs. Due to the relatively low energies involved, the NHLs will be produced primarily from pions, each NHL decaying into an electron, a positron, and a neutrino, or a muon, an electron, and a neutrino. These decays will be identified by the detection of Cerenkov rings by the photomultiplier tubes in the detector. The possible ranges of Neutral Heavy Leptons that will be detectable by BooNE will be discussed, with some preliminary estimates.

Luis Robert Flores Castillo,University of Pittsburgh
CDF,PosterSimulation, Reconstruction, and Visualization of CDFII with some J/Psi Kshort examples

Kris Chaisanguanthum, Caolionn O'Connel, Harvard
Iris Monica Vargas, University of Puerto Rico, Rio Piedras
CDF, Poster: CDF - The Central Muon eXtension

Linda Coney, Univ. of Notre Dame
D0, Talk :Diffractive W Boson Production at D0
Abstract: We present preliminary results on diffractive W boson production in proton-antiproton collisions at sqrt(s)=1800 GeV using the D0 detector. A significant excess of events with low particle multiplicity is observed above expectation for non-diffractive W boson production

Gregory Davis, The University of Rochester
D0, Talk:Direct measurement of Vtb from D0
Abstract: The top to bottom element of the Cabibbo-Kobayashi-Maskawa matrix has been deduced from other experiments, but until run I of the Tevatron it had been impossible to measure it by actually looking at top quarks decaying into bottom quarks. Using maximum likelihood methods, we are looking to make this measurement from run I data. We hope this method can be used to extract the number from run II.

Kevin Davis, University of Arizona
D0, Talk : A Measurement of the Bottom Quark Production Cross Section at sqrt(s)=630 GeV
Abstract: A Measurement of the Bottom Quark Production Cross Section at sqrt(s)=630 GeV Abstract of Presentation: We present a measurement of the bottom quark production cross section made using muons with associated jets at sqrt(s)=630 GeV using the D0 detector. The measurement exceeds next-to-leading order predictions by roughly a factor of 3.

Justin Frantz, Liubo Borissov, Columbia University
Jessica Cronk, Bucknell University
NuTeV Poster: NuTeV

Ivan Furic, MIT
CDF, TalkDesign of the Level-3 PC Farm Monitoring for CDF Run II

Russel Gilmartin, Florida State University
D0, Poster Technicolor Research at the D0 experiment (\rho_T^\pm -> W^\pm \pi_T^0 -> (\ell\nu)(b\barb)
Abstract: Technicolor theories explain the origin of electroweak symmetry breaking by introducing new strong interactions. These theories predict new technihadrons that may be produced at modest rates (\sigma \sim 1-20~pb) at the Tevatron. We will present results from a search for the technicolor \rho_T particles in the decay channels \rho_T^\pm \rightarrow W^\pm \pi_T^0 \rightarrow (\ell\nu)(b\barb) and \rho_T^0\rightarrow W^\pm\pi_T^\mp\rightarrow(\ell\nu)(b\barc) (\rho_T\equivtechnirho, \pi_T\equivtechnipion, \ell\equive), using Run I data from the DØ\ experiment.

David Goldstein, UCLA
CDF, Poster:The CDF Relative Alignment System (RASNIKs)

J. Andrew Green, Iowa State University
D0, Talk+Poster :Search for Technicolor at D0
Abstract: The problems of Electro-Weak and flavor symmetry breaking as well as the problem of the origin of mass continues to ellude us. Technicolor (with modifications) may address these issues. At the D0 experiment a search, using Neural Networks, is performed on potential signatures of a low-scale version of the theory via the neutral sector, techni-vector --> gamma + techni-scalar --> gamma + b-bbar where techni-vector may be the neutral techni-omega or techni-rho, and the techni-scalar is any of the neutral techni-pions. A sensitivity study for Runs II and III is also presented.

Zuleyma Gonzalez, University of Puerto Rico - Mayaguez Campus
CDF, Poster:Overview of BTeV R&D

Fabio Happacher, LNF-INFN
CDF, Talk : New measurement of top production cross section in the lepton plus jets channel using SECVTX tagging algorithm

Kenichi Hatakeyama, The Rockefeller University
CDF, Talk+Poster: Single Diffractive Dijets at CDF
Abstract: We report results on the diffractive dijet production in $\bar{p}p$ collisions at $\sqrt{s}=$630 and 1800 GeV. The diffractive events, $\bar{p}+p \rightarrow \bar{p}+Jet1+Jet2+X$, were tagged by detecting the final state $\bar{p}$ in a Roman-pot Spectrometer. The diffractive structure of the (anti)proton is extracted and compared with results obtained at HERA.

Marc Hill, Harvard/SLAC
SLAC,Accelerator Research Dept. Talk: mm-Wave Power Production: Progress Towards a mm-Wave Accelerator
Abstract: We present results from a harmonic power production experiment to produce 91.392 GHz (W-Band) power from a 11.424 GHz (X-Band) bunched beam. We present results including 1 kW peak power production and plans for upcoming experiments to produce up to 1 MW peak power

Melin Huang, University of Virginia
HyperCP Poster: CP violation in Hyperon decay

Vadim Kashikhin, FNAL
Technical Division, Poster HFM first model magnetic design
Abstract: High field accelerator magnets for future Very Large Hadron Collider are being developed at Fermilab in collaboration with LBNL and KEK. The aim of this work is to develop a cost-effective magnet providing the nominal field of 11 T based on Nb3Sn superconductor and techniques for its fabrication. This poster describes the high field dipole R&D including cable and strand parameters, different coil and yoke cross-sections and magnet end geometry. The calculation results of magnetic field distribution and field quality including geometrical harmonics, coil magnetization, and iron yoke saturation effects are reported.

Jason Kasper, Northwestern University
E835, PosterCharmonium in the Antiproton Source
Abstract: Data from E-835 part 1, preparations of the antiproton source for the next run.

Mithat Kaya, Iowa University
SELEX,Poster: Preliminary and recent results from SELEX-E781
Abstract: Preliminary and recent results from SELEX-E781 (P) Abstract of Presentation: SELEX- E781 was an experiment which took data in the last fixed target run 1996-1997. Mainly, we search for strange-charm baryons produced by hadrons (sigmas, protons and pions). This experiment contains great vertex and particle identification detectors which are essential tools for charm analysis. We will present preliminary and recent results in charm and non-charm physics.

Ben Kilminster, University of Rochester
CDF, Poster: Online Software-Based Data Selection at CDF Run II

Abstract: The Level-3 trigger for CDF run II is responsible for filtering and partially- reconstructing 300 Hz of 250 kB events in order to provide a logging rate of 75 Hz of interesting events. A farm of Pentium-based PCs will be used to accommodate this large amount of data processing. The PCs will able to run offline reconstruction algorithms with minimal or no modification. After the trigger tasks, the events are passed through the Consumer-Server/Logger at 20 MB/s. This data hub receives and logs the data, while communicating with remote online monitoring processes and distributing to them requested events.

Andreas Korn, MIT
CDF, Talk: Studies towards a sin 2 beta analysis
Abstract: Results from CDF run I on sin 2 beta will be presented. A brief insight in ongoing studies is given. The talk will conclude with an outlook on run II expectations.

Wayne Lundberg, USAF/ University of Dayton
Theory (guest) Talk: The Origin of Mass

Jocelyn Monroe, Columbia University
BooNE, Poster: BooNe - nu-e or not nu-e, that is the question
Abstract: The BooNE experiment will search for oscillations between muon-neutrinos and electron-neutrinos for neutrino mass differences greater than 0.01 eV**2, and for mixing parameters less than about 0.05. The experiment will also look for a muon-neutrino disappearance signal. If neutrino oscillations are observed, the experiment will be able to measure the mass difference and the mixing angle and search for CP violation in the lepton sector. This experiment is motivated by the Liquid Scintillator Neutrino Detector (LSND) observation at LANL, which has been interpreted as antimuon-neutrino to antielectron-neutrino oscillations, and by the atmospheric neutrino deficit which may be ascribed to muon-neutrino oscillations.

Paul Ngan, M.I.T.
CDF, Talk: Measurement of the $\psi(2S)$ Production Polarization in ${\rm p}\bar{\rm p}$ Collisions at \mbox{$\sqrt{\rm s} = 1.8\mbox{\,TeV}$}
Abstract: We present a measurement of the production polarization of $\psi(2S)$ mesons in ${\rm p}\bar{\rm p}$ collisions. \mbox{$P_T$} dependence of the polarization has been suggested as a test of the Color Octet Model. This model is a popular explanation for the unexpectedly large direct charmonium cross section. We consider the decay mode $\psi(2S) \longrightarrow \mu^+ \mu^-$ in a 110 pb$^{-1}$ sample collected by CDF during 1992-95. $c\tau$ information is used to distinguish prompt production from $B$ decays.

Arnold Pompos, Purdue University
CDF,Talk: Search for the Supersymmetric Partner of the Top Quark at CDF Abstract: Supersymmetry (SUSY) is one of the most appealing theories as a next step towards grand unification. The supersymmetric partner of the top quark ( stop) could be produced in $p\bar p$ collisions at the Fermilab Tevatron if kinematically allowed. Decays analogous to the Standard Model top decay, i.e. into chargino and bottom quark, would result in final state with two or more energetic leptons, b jets and substantial energy imbalance. If this decay mode is kinematically allowed, it dominates. However, if this channel is closed, three body decay (via a virtual chargino) of the stop could be opened, namely the decay into a lepton, bottom quark and a supersymmetric neutrino. This decay path would lead to the same final state signatures as the two body decay of the stop quark. Our search for the stop quarks is based on $100\invpb$ of $p\bar p $ collisions at $\sqrt s = 1.8TeV$ recorded with the Collider Detector at Fermilab ( CDF).

Val Prasad, University of Chicago
KTeV, Talk: Search for Direct CP-Violation in the Neutral Kaon System
Abstract: The recent measurement of the direct CP-violating parameter, e'/e, by the KTeV experiment will be discussed

Alexander Rakitin MIT,
CDF Talk:An investigation of $\bf {b/\bar{b}}$-quark flavor tagging methods in lepton + charm events at $\sqrt{\bf {s}}$=1.8 TeV
Abstract: The "Same Side", "Jet Charge" and "Soft Lepton" algorithms were studied to determine the $b/\bar{b}$-quark flavor of $B$-mesons at the time of production. A sample of almost 10,000 $B_{u,d} \rightarrow l D^{(*)} X$ decays collected during the 1992-1995 run was analyzed. The efficacy of the tagging methods may be demonstrated by revealing the time-dependent flavor oscillation of $B^0$-mesons.

Gordon Richards University of Chicago
SDSS, Poster: Gravitational Lenses and the Sloan Digital Sky Survey

Abstract: The imaging data of the Sloan Digital Sky Survey (SDSS) provides the basis for a powerful gravitational lens survey as it allows the selection of a large number of QSOs. It is expected that the SDSS photometric sample will contain of order 1000 gravitationally lensed QSOs -- thus the SDSS will discover substantially more lenses than are currently known. More importantly, the selection function from which these lenses are drawn will be known exquisitely well. This combination of a large number of lensed QSOs coupled with a well-known selection function provide the basis set for accurate measurements of cosmological parameters and for detailed studies of galaxy properties.

Rob SnihurNorthwestern University
D0, Talk:Quark and Gluon Jets at D0: Subjet Structure Using the $k_T$ Algorithm
Abstract: The Tevatron is an abundant source of both gluon and quark jets. We analyze a gluon enriched jet sample at $\sqrt{s}=1800$ GeV, and compare to a quark enriched jet sample at $\sqrt{s}=630$ GeV. The jets are reconstructed with a successive combination type of jet algorithm ($k_{T}$). We study internal jet structure by resolving subjets, which are defined naturally within $k_{T}$ jets. We observe more subjets in the $\sqrt{s}=1800$ GeV jet sample, as predicted by the HERWIG Monte Carlo. We then extract the subjet multiplicity in pure quark and gluon jets from an appropriate linear combination of the mixed jet samples at $\sqrt{s}=1800$ and 630 GeV. Gluon jets have approximately twice as many subjets compared to quark jets.

John Strologas, University of Illinois at Urbana Champaign
CDF, Talk: The CDF Central Muon System for Run II
Abstract: The Central Muon System of the CDF detector consists of the Central Muon Detector (CMU), the Central Muon Upgrade (CMP) and the Central Muon Extension (CMX), which are all collections of drift chambers. For the CMP and the CMX an extra system of scintillator counters provide accurate timing information for the traversing muons. We will describe the system and discuss the status of the upgrade for Run II, which includes the increase of the CMP and CMX coverage and the improvement of the CMU and CMP front-end electronics to accommodate the higher luminosity (2 $\times$ 10$^{32}$ cm$^{-2}$/sec) and the smaller accelerator bunch spacing (132 - 396 ns) of the upgraded Tevatron collider.

Narumon Suwonjandee, University of Cincinnati
BooNE, Talk: The BooNE Experiment Abstract: In the Standard Model, neutrinos are generally assumed to be massless. If neutrinos have masses, there may be mixing between the different types. This could lead to neutrino oscillations. The LSND experiment has observed \bar \nu_\mu \rightarrow \bar \nu_e process by using 800 MeV of incident proton beam and a distance of 50 m. from the neutrino source to the detector. The BooNE experiment will search for \nu_\mu \rightarrow \nu_e oscillation by using the same ratio of L/E_\nu as the LSND experiment. In this talk, I will present an overview of the BooNE experiment and its present status.

Masashi Tanaka, University of Tsukuba
CDF,Talk+Poster: Search for Radiative b Decays using Gamma Conversions at CDF
Abstract: I report a search for radiative b decays using gamma conversions at CDF. B_d -> K^*0 gamma and B_s -> Phi gamma are reconstructed exclusively by using photon conversions in inner detectors. We set upper limits of 1.7x10^-4 and 2.4x10^-4 on branching fraction of B_d -> K^*0 gamma and B_s -> Phi gamma respectively at the 90% confidence level. The limit for B_s -> Phi gamma is the best limit.

Daniel Wijngaarden, Katholieke Universiteit Nijmegen
D0, Poster:Protecting the Silicon Microstrip Detector
Abstract: High level radiation in the vertex area could damage the silicon microstrip detector. Beam losses and stray radiation (scrapings, pencil losses) need to be monitored to limit the total radiation dosis received by the silicon.

Matthew Worcester, UCLA
CDF, Talk : Search for Chargino-Neutralino Production at CDF using Like-Sign Dileptons
Abstract: We present a search for like-sign dilepton events using Monte Carlo simulations < generated for the CDF experiment at the Fermilab Tevatron. We examine the sensitivity of this search for the following process: ppbar production of a chargino and neutralino, which decay into 3 leptons plus the lightest neutralino via either virtual W and Z or virtual sleptons. We compare our results to a trilepton search for the same production mode and find a significant increase in signal efficiency and overall sensitivity.