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Search for Scalar Top at CDF

Description: We report results of three searches for scalar top quark. Two of the searches look for direct production of scalar top quark followed by the decay of the scalar quark to charm quark and neutralino or bottom and chargino. The third search looks for top quark decaying to scalar top and neutralino followed by the decay of scalar top to bottom quark and neutralino. We find no evidence for the presence of scalar top quark in any of the searches. Therefore, depending on the search we set limits on the production cross-section, BR(t {yields} {tilde t}{sub 1} + {tilde {chi}}{sup 0}{sub 1}), or m{sub {tilde t}} vs. m{sub {tilde {chi}}{sup 0}{sub 1}}.
Date: May 11, 1999
Creator: Holck, C.
Partner: UNT Libraries Government Documents Department

Top quark mass from CDF

Description: We report on the most recent measurements of the top quark mass in three decay channels, performed by the CDF Collaboration at the Tevatron collider. We combine these results to obtain a mass value of 176.0 #6; 6.5 GeV/ c 2.
Date: March 2, 1999
Creator: Yao, W.-M.
Partner: UNT Libraries Government Documents Department

Initial experience with the CDF layer 00 silicon detector

Description: We report on initial experience with the CDF Layer 00 Detector. Layer 00 is an innovative, low-mass, silicon detector installed in CDF during the upgrade for Run 2A of the Tevatron. Noise pickup present during operation at CDF is discussed. An event-by-event pedestal correction implemented by CDF is presented. This off-line solution prevents L00 from being used in the current incarnation of the on-line displaced track trigger. Preliminary performance of Layer 00 is described.
Date: March 17, 2003
Creator: Hill, C.
Partner: UNT Libraries Government Documents Department

Performance of CDF for B physics

Description: Hadron colliders can be an abundant source of heavy flavor, but pose a challenge to isolate the physics signals from the high backgrounds. The upgraded CDFII detector, with its precise tracking capabilities and powerful trigger system, is well equipped for this task. The detector is described with an emphasis on actual performance and on techniques to maximize the heavy flavor yield. Some first heavy flavor results are summarized.
Date: June 11, 2003
Creator: Oldeman, R.
Partner: UNT Libraries Government Documents Department

CDF at the Tevatron collider in Run 2

Description: Run 2 of the Tevatron began in early 2001 after extensive upgrades to both the machine and the CDF and D0 detectors. For CDF, new tracking detectors, increased muon coverage, state-of-the-art front end electronics, pipelined triggering, and a complete overhaul of the DAQ have made it a very powerful tool to explore physics of all kinds. The status of CDF in Run 2 is presented, along with a first glimpse of CDF data.
Date: April 3, 2002
Creator: Erbacher, Robin D.
Partner: UNT Libraries Government Documents Department

The CDF data handling system

Description: The Collider Detector at Fermilab (CDF) records proton-antiproton collisions at center of mass energy of 2.0 TeV at the Tevatron collider. A new collider run, Run II, of the Tevatron started in April 2001. Increased luminosity will result in about 1 PB of data recorded on tapes in the next two years. Currently the CDF experiment has about 260 TB of data stored on tapes. This amount includes raw and reconstructed data and their derivatives. The data storage and retrieval are managed by the CDF Data Handling (DH) system. This system has been designed to accommodate the increased demands of the Run II environment and has proven robust and reliable in providing reliable flow of data from the detector to the end user. This paper gives an overview of the CDF Run II Data Handling system which has evolved significantly over the course of this year. An outline of the future direction of the system is given.
Date: November 5, 2003
Creator: Litvintsev, Dmitry O.
Partner: UNT Libraries Government Documents Department

CDF: Run II Physics Projections

Description: In March 2001, the Fermilab Tevatron will start a new physics run of p{bar p} collisions at {radical}s = 2.0 TeV. The CDF experiments will collect a data sample of 2 fb{sup {minus}1} in the first two years. In this paper the authors describe the B physics prospects at CDF during the upcoming run.
Date: December 20, 2000
Creator: Tanaka, Maashi
Partner: UNT Libraries Government Documents Department

CDF Run II status and prospects

Description: Run II at the Tevatron Collider started at the beginning of March 2001. With extensive upgrades on both detectors and electronics the CDF II began to collect data. This paper reviews early Run II physics results obtained by analyzing data collected before the middle of June 2002. At the present the understanding of the detector performances is rather high so many analysis are already underway.
Date: February 6, 2003
Creator: Pagliarone, C.
Partner: UNT Libraries Government Documents Department

Results on CP violation from CDF

Description: The CDF experiment at the Tevatron collider is collecting a large sample of fully hadronic decays of Bottom and Charm mesons. First CP Violation measurements have been performed using the initial data, achieving results which clearly state the CDF ability in extracting significant CKM information from p{bar p} collisions. The first results on direct CP asymmetries on Charm and Bottom decays and future plans from the CDF experiment are discussed in this paper.
Date: December 11, 2003
Creator: Giagu, S.
Partner: UNT Libraries Government Documents Department

Tevatron Run II luminosity, emittances and collision point size

Description: The authors compare the Tevatron luminosity as measured by the CDF and D0 experiments with that computed from machine characteristics. They also compare the CDF measurements for the size of the interaction region with that predicted by machine parameters. Although these results are still preliminary, they show promise as a useful crosscheck of the instrumentation and our understanding of the Tevatron machine characteristics.
Date: June 9, 2003
Creator: al., Jean Slaughter et
Partner: UNT Libraries Government Documents Department

A study of jet energy measurement at CDF

Description: This thesis describes the effort being made to improve the Jet Energy Reconstruction as performed by the CDF international collaboration at the Tevatron collider. This experiment studies proton-antiproton interactions at a center of mass energy of 1.8 TeV. During the three years data taking period Run 1, from 1992 to 1995 the CDF experiment collected an amount of data corresponding to a total integrated luminosity of 110 pb{sup -1}. One of the major results obtained analyzing this data sample is the discovery of the top quark. In the year 2000 a new period of data taking, Run 11, will start with a higher luminosity and a slightly higher center of mass energy giving us the chance to explore high energy physics even deeper. In preparation of this new run several upgrades are being made to adapt the CDF detector to the high luminosity foreseen and to improve its capabilities. Many signatures requested to trigger the detector aim at signaling a quark or a gluon in the final state. Unfortunately we are not able to measure quarks as free particles because they undergo a fragmentation process when turning into jets of particles. Thus it is of key importance to build up algorithms which reconstruct the energy of the initial parton starting from the jet informations. The description of the algorithm adopted till now will be given as an introduction to the new method being developed, that will be the main subject of this thesis. In Chapter I we will give a theoretical introduction on strong interactions to describe the mechanism to produce hadronic jets. In Chapter 2 we will describe some results from the experiment where the reconstruction of hadronic jets was important. Here we will also mention some important results which we think we can obtain during new the data ...
Date: September 1, 1998
Partner: UNT Libraries Government Documents Department

Recent results from CDF

Description: The authors report on the recent heavy-quark results from CDF in Run IIa. They focus on a selection of mature analyses that demonstrate the capabilities of the experiment to extract interesting physics from the data. A few of the results presented have already been submitted for publication and papers are being prepared for most of the others.
Date: January 26, 2004
Creator: Harr, R.
Partner: UNT Libraries Government Documents Department

Top quark physics with CDF

Description: In this contributions to the proceedings of the HCP conference I will give a brief overview on the CDF upgrade for Run II relevant to top quark physics analyses. I will discuss the CDF top physics program, with particular emphasis to the search for single top quark production. This includes a review of single top quark analyses in Run I.
Date: December 13, 2002
Creator: Wagner, W.
Partner: UNT Libraries Government Documents Department

The Ssart of Run II at CDF

Description: After a hiatus of almost 6 years and an extensive upgrade, Tevatron, the world largest proton-antiproton collider, has resumed the operation for the so called RUN II. In this paper we give a brief overview of the many new features of the Tevatron complex and of the upgraded CDF experiment, and show the presently achieved detector performances as well as highlights of the RUN II physics program in the beauty and electroweak sector.
Date: October 29, 2002
Creator: Rescigno, Marco
Partner: UNT Libraries Government Documents Department

Status of CDF Run II Upgrade

Description: For the past several years, the CDF collaboration has been upgrading its detector to accommodate the higher luminosity and beam energy expected during Run II (2001-2006) at the Tevatron p{bar p} collider. Accelerator improvements include increasing the instantaneous luminosity by an order of magnitude with respect to Run I to 2 x 10{sup 32} cm{sup {minus}2} s{sup {minus}1} and increasing the center of mass energy from 1.8 TeV to 2.0 TeV. The detector upgrades include replacing the entire tracking volume, extending the muon coverage, adding a time of flight system, and improving the selection capabilities of the trigger. The partially instrumented detector underwent a commissioning run during September/October 2000 in preparation for starting data taking in Spring 2001 with the full detector. Now that Run II has been extended through 2006, we expect to collect an integrated luminosity of 2 fb{sup {minus}1} during the first two years of running and up to a total of 15 fb{sup {minus}1} by the end of Run II.
Date: December 20, 2000
Creator: Cranshaw, Jack
Partner: UNT Libraries Government Documents Department

Status of the CDF Run II Silicon Detector

Description: A snapshot of the status of the CDF Run II Silicon Detector is presented, with a summary of commissioning issues since the start of Run II, current performance of the detector, and the use of the data in both the trigger and offline reconstruction.
Date: April 10, 2003
Creator: Nahn, S.
Partner: UNT Libraries Government Documents Department

Strangeness production in minimum-bias events at CDF

Description: In a recently published paper 1 are emphasized, for the soft subsample extracted from the minimum-bias (MB) dataset of p{bar p} collisions, interesting invariances with the c.m. energy of the charged multiplicity and p{sub T} distributions. We present an analogous study on V{sup 0} production.
Date: January 15, 2003
Creator: Moggi, N.
Partner: UNT Libraries Government Documents Department

Run II data analysis on the grid

Description: In this document, we begin the technical design for the distributed RunII computing for CDF and D0. The present paper defines the three components of the data handling area of Run II computing, namely the Data Handling System, the Storage System and the Application. We outline their functionality and interaction between them. We identify necessary and desirable elements of the interfaces.
Date: December 2, 2002
Creator: Igor Mandrichenko, Igor Terekhov and Frank Wurthwein
Partner: UNT Libraries Government Documents Department