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Full-Text Articles in Entire DC Network
Analyzing Traffic And Multicast Switch Issues In An Atm Network., Youngcheol Oh
Analyzing Traffic And Multicast Switch Issues In An Atm Network., Youngcheol Oh
LSU Historical Dissertations and Theses
This dissertation attempts to solve two problems related to an ATM network. First, we consider packetized voice and video sources as the incoming traffic to an ATM multiplexer and propose modeling methods for both individual and aggregated traffic sources. These methods are, then, used to analyze performance parameters such as buffer occupancy, cell loss probability, and cell delay. Results, thus obtained, for different buffer sizes and number of voice and video sources are analyzed and compared with those generated from existing techniques. Second, we study the priority handling feature for time critical services in an ATM multicast switch. For this, …
Fluorescence Studies Of Ecori Restriction Endonuclease Structure And Dynamics., Wei Liu
Fluorescence Studies Of Ecori Restriction Endonuclease Structure And Dynamics., Wei Liu
LSU Historical Dissertations and Theses
Sequence specific protein-DNA interaction involves changes in protein conformation and dynamics. Research work involved in this thesis is the study of structure and dynamics of EcoRI restriction endonuclease N-termini. The N-termini of EcoRI endonuclease has been shown to be essential for DNA cleavage and also stabilize EcoRI-DNA complex. But they are not resolved in the X-ray crystal structure. An Asn3Cys mutation was made at the N-termini by site-directed mutagenesis and the mutant was subjected to cysteine crosslinking, pyrene labeling and fluorescence studies. Chemical crosslinking of Asn3Cys mutant and steady-state fluorescence studies of pyrene-labeled mutant indicated that the N-termini are in …
Characterization Of Physiological Changes In Roots Grown In Spaceflight Conditions: A Comparison Of Nutrient Delivery Technologies., David Marshall Porterfield
Characterization Of Physiological Changes In Roots Grown In Spaceflight Conditions: A Comparison Of Nutrient Delivery Technologies., David Marshall Porterfield
LSU Historical Dissertations and Theses
The best strategy for providing food and maintaining the environment on long-duration space missions is a bioregenerative life support system based on the growth of higher plants. Before such a system can be implemented, a better understanding of plant growth in space will have to be achieved. Little is known about the role of gravity-dependent physical processes in normal physiological function. A series of ground-based and spaceflight experiments was conducted to examine root oxygen availability in microgravity nutrient delivery systems. In spaceflight experiments Arabidopsis thaliana (L.) Heynh. plants were analyzed for changes in root medium redox potential and root alcohol …
A Reusability Model That Creates Design Frameworks Using A Formal Specification Clustering Approach., Youwen Ouyang
A Reusability Model That Creates Design Frameworks Using A Formal Specification Clustering Approach., Youwen Ouyang
LSU Historical Dissertations and Theses
Software reuse has been advocated as a technique with great potential to increase software development productivity, reduce development cycle time, and improve product quality. Challenges for successful reuse include populating the repository with the right type of components, representing and organizing the components in a way that the components are easy to be retrieved, and providing mechanisms to compare the candidate components with the requirement of the new component and to assist adaptation. While many existing researches are emphasizing one or two challenges, this research proposes a reusability model that targets all challenges in reuse. The inspiration for the model …
Performance Analysis Of Multi-Echelon Inventory Systems., David Lee Peak
Performance Analysis Of Multi-Echelon Inventory Systems., David Lee Peak
LSU Historical Dissertations and Theses
A two-echelon inventory and distribution system consisting of a centralized warehouse and N stores is considered in this paper. The inventories of the warehouse as well as the stores are controlled by periodic review (s,S) ordering policies. The expected levels of capital investment, storage space needs, capacity requirements for delivery vehicles, and reliable customer service are issues of great importance to practitioners when considering the introduction of a central warehouse and transportation system. Helmut Schneider, Dan Rinks, and Peter Kelle have developed a methodology that has been shown to provide approximately optimal (s,S) policies under various demand conditions, and are …
Virtual Central Control., Raghuram A. Yedatore
Virtual Central Control., Raghuram A. Yedatore
LSU Historical Dissertations and Theses
A distributed system is a set of cooperating computers (processes) communicating with each other to achieve a common goal. They are broadly classified as centralized and decentralised systems. In a centralized system, a single computer plays the role of central coordinator and controls all the system activities. Whereas in a decentralized system, all the cooperating processes have an equal role to play, therefore solutions to problems involve instructing all the processes and coordinating their actions. Although a centralized system facilitates program development, it has serious drawbacks. If the coordinator fails, the system effectively breaks down. Also, the coordinator can become …
The Effect Of Silvicultural Treatments On Certain Mechanical And Physical Properties Of Loblolly Pine Wood Composites., Todd Finley Shupe
The Effect Of Silvicultural Treatments On Certain Mechanical And Physical Properties Of Loblolly Pine Wood Composites., Todd Finley Shupe
LSU Historical Dissertations and Theses
The effects of silvicultural treatments on mechanical and physical properties of loblolly pine (Pinus taeda L.) wood composites, veneer tensile and bending properties, and basic chemical properties were investigated. Stands managed in a plantation setting showed higher extractive contents. Holocellulose and alpha-cellulose were minimally affected by the silvicultural strategies. Klason lignin showed an inverse relationship with holocellulose. The effect of wood type was significant for the extractives because the innerwood region yielded much greater values than the outerwood. Holocellulose and alpha-cellulose increased in concentration from innerwood to outerwood. Veneer tensile strength was significantly affected by silvicultural practice, but other mechanical …
From Object-Oriented Specification To Implementation: A Formal Refinement Methodology., Moonsung Yoo
From Object-Oriented Specification To Implementation: A Formal Refinement Methodology., Moonsung Yoo
LSU Historical Dissertations and Theses
Traditionally, software development models use different methods and techniques in each phase from specification through design to implementation. Significant changes in the representations between phases have been common. The formal development method based on formal specification and stepwise development has been suggested to reduce the change in representation. The formal development method consists of a formal specification and verified design. In the formal specification step, a formal specification language is used to specify an accurate, consistent, and complete system. Vienna Development Method (VDM) is one of the most widely used formal specification languages. A verified design guides the development of …
Set Redundancy, The Enhanced Compression Model, And Methods For Compressing Sets Of Similar Images., Kosmas Karadimitriou
Set Redundancy, The Enhanced Compression Model, And Methods For Compressing Sets Of Similar Images., Kosmas Karadimitriou
LSU Historical Dissertations and Theses
Image compression is the process of reducing the number of bits required to represent an image. This can be achieved by reducing (or ideally, eliminating) various types of redundancy that exist in the imaging data. All current image compression methods are based on the same theoretical model, which targets redundancy found in individual images. However, this model ignores an additional type of redundancy that exists in sets of similar images, the "set redundancy". The source of set redundancy is the common information existing in more than one image in a set of similar images. Set redundancy can be recognized by …
The Performance Effects Of Strategy, Top-Management Characteristics, And Environment: An Integrative Study Of Firm Decline And Turnaround., Franz Theodore Lohrke
The Performance Effects Of Strategy, Top-Management Characteristics, And Environment: An Integrative Study Of Firm Decline And Turnaround., Franz Theodore Lohrke
LSU Historical Dissertations and Theses
Despite accumulating evidence, unresolved issues remain as to how the components of strategy, top-management characteristics, and environment, as independent variables, combine to affect a firm's success or failure in turning around declining performance. To address such issues, this dissertation developed and tested a series of hypotheses that investigates the effects of strategy, top-management characteristics, and environment on performance. Findings show that turnaround strategy alone is insufficient to explain differences in performance among firms. They also provide some support for the importance of TMG-strategy interaction and show a limited role for the environment in a firm's turnaround. Additionally, the findings show …
An Integrated Network Architecture For A High Speed Distributed Multimedia System., Nitin Subrao Naik
An Integrated Network Architecture For A High Speed Distributed Multimedia System., Nitin Subrao Naik
LSU Historical Dissertations and Theses
Computer communication demands for higher bandwidth and smaller delays are increasing rapidly as the march into the twenty-first century gains momentum. These demands are generated by visualization applications which model complex real time phenomena in visual form, electronic document imaging and manipulation, concurrent engineering, on-line databases and multimedia applications which integrate audio, video and data. The convergence of the computer and video worlds is leading to the emergence of a distributed multimedia environment. This research investigates an integrated approach in the design of a high speed computer-video local area network for a distributed multimedia environment. The initial step in providing …
Experimental Investigation Of Wall And Inertial Effects On A Disk Sedimenting At Low Reynolds Number., Joe Wade Pulley
Experimental Investigation Of Wall And Inertial Effects On A Disk Sedimenting At Low Reynolds Number., Joe Wade Pulley
LSU Historical Dissertations and Theses
Measurements have been made of the drag on a thin disk of diameter d moving broadside through a liquid of viscosity $\mu$ and density $\rho$. The liquid is bounded on the outside by a cylindrical tube, diameter D, which is coaxial with the disk. The geometrical parameter $\xi$ = d/D ranges from 0.0189 to 0.112. The Reynolds number Re = $\rho$Ud/$\mu$ ranges from 0.0167 to 6.89. When the measured values are extrapolated to Re = 0, the results agree with the calculations of Shail and Norton. When extrapolated to $\xi$ = 0, the results agree with the matched-asymptotic series solution …
Evaluating The Impact Of Agricultural Exports On The Louisiana Economy, David Wheeler Hughes
Evaluating The Impact Of Agricultural Exports On The Louisiana Economy, David Wheeler Hughes
LSU Agricultural Experiment Station Reports
No abstract provided.
Measuring Rural-Urban Economic Linkages In The Monroe Louisiana Trading Area Through A Multiregional Input-Output Model, David W. Hughes
Measuring Rural-Urban Economic Linkages In The Monroe Louisiana Trading Area Through A Multiregional Input-Output Model, David W. Hughes
LSU Agricultural Experiment Station Reports
No abstract provided.
Impacts Of Fire And Vertebrate Herbivores On Plant Community Characteristics And Soil Processes In A Coastal Marsh Of Eastern Louisiana, United States Of America., Mark Alan Ford
LSU Historical Dissertations and Theses
Both vertebrate herbivores and fire have long been known to have dramatic and important effects on wetlands. In the first part of this study, conducted in the Pearl River Basin coastal marshes of Louisiana, the interaction between the effects of mammalian herbivores, especially nutria and wild boar, and fire was examined in three marsh community types: those dominated by Sagittaria lancifolia, Panicum virgatum, or Spartina patens/Scirpus americanus. Overall, above-ground biomass was reduced by burning but increased by fencing. Richness only increased in plots that were both burned and fenced. In the three communities, only Scirpus americanus cover was enhanced by …
Measurement Of The Diffractive Structure Function In Deep Inelastic Scattering At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Measurement Of The Diffractive Structure Function In Deep Inelastic Scattering At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Faculty Publications
This paper presents an analysis of the inclusive properties of diffractive deep inelastic scattering events produced in ep interactions at HERA. The events are characterised by a rapidity gap between the outgoing proton system and the remaining hadronic system. Inclusive distributions are presented and compared with Monte Carlo models for diffractive processes. The data are consistent with models where the pomeron structure function has a hard and a soft contribution. The diffractive structure function is measured as a function of xℙ, the momentum fraction lost by the proton, of β, the momentum fraction of the struck quark with respect to …
Measurement Of The Proton Structure Function F 2 At Low X And Low Q 2 At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz, F. Palmonari
Measurement Of The Proton Structure Function F 2 At Low X And Low Q 2 At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz, F. Palmonari
Faculty Publications
We report on a measurement of the proton structure function F 2 in the range 3.5×10-5≤x≤4×10-3 and 1.5 GeV2≤Q 2≤15GeV2 at the ep collider HERA operating at a centre-of-mass energy of √s=300GeV. The rise of F 2 with decreasing x observed in the previous HERA measurements persists in this lower x and Q 2 range. The Q 2 evolution of F 2, even at the lowest Q 2 and x measured, is consistent with perturbative QCD. © 1996 Springer-Verlag.
A Feasibility Study Of Using Air-Lift Pumps For Aeration, Degasification, And Water Movement In A Recirculating Aquaculture System, John Clay Loyless
A Feasibility Study Of Using Air-Lift Pumps For Aeration, Degasification, And Water Movement In A Recirculating Aquaculture System, John Clay Loyless
LSU Historical Dissertations and Theses
A feasibility study of using air-lift pumps for water movement, aeration, and degasification in a recirculating aquaculture system was conducted. Fluid delivery tests of various air-lift configurations indicated that water flow is a function of the submergence depth, lift height, and air injection rate. The air-lift units were found to transfer 02 at only 1/5 to 1/2 the rate of comparably operated open-water aeration systems. The standard oxygen transfer rate (SOTR) increased with air injection from 1-7 scftn, however, the energy usage also increased, yielding a reduction in the standard aeration efficiency (SAE) from over 2 to less than 0.5 …
Measurement Of Αsfrom Jet Rates In Deep Inelastic Scattering At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Measurement Of Αsfrom Jet Rates In Deep Inelastic Scattering At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Faculty Publications
Jet production in deep inelastic scattering for 120 < Q2< 3600 GeV2has been studied using data from an integrated luminosity of 3.2 pb-1collected with the ZEUS detector at HERA. Jets are identified with the JADE algorithm. A cut on the angular distribution of parton emission in the γ*-parton centre-of-mass system minimises the experimental and theoretical uncertainties in the determination of the jet rates. The jet rates, when compared to O(αs2) perturbative QCD calculations, allow a precise determination of αs(Q) in three Q2-intervals. The values are consistent with a running of ifαs(Q), as expected from QCD. Extrapolating to Q = MZ0αs(MZ0) = 0.117 ± 0.005 (stat)-0.005+0.004(systexp) ± 0.007 (systtheory). © 1995.
Louisiana Agriculture Magazine, Fall 1995, Lsu Agricultural Experiment Station
Louisiana Agriculture Magazine, Fall 1995, Lsu Agricultural Experiment Station
Louisiana Agriculture
No abstract provided.
Exclusive Ρ0 Production In Deep Inelastic Electron-Proton Scattering At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Exclusive Ρ0 Production In Deep Inelastic Electron-Proton Scattering At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Faculty Publications
The exclusive production of ρ{variant}0mesons in deep inelastic electron-proton scattering has been studied using the ZEUS detector. Cross sections have been measured in the range 7 < Q2< 25 GeV2for λ*p centre of mass (c.m.) energies 40 to 130 GeV. The λ*p → ρ{variant}0p cross section exhibits a Q-(4.2±0.8-0.5+1.4)dependence and both longitudinally and transversely polarised ρ{variant}0's are observed. The λ*p → ρ{variant}0p cross section rises strongly with increasing c.m. energy, when compared with NMC data at lower energy, which cannot be explained by production through soft pomeron exchange. The data are compared with perturbative QCD calculations where the rise in the cross section reflects the increase in the gluon density at low x. © 1995.
Diffractive Hard Photoproduction At Hera And Evidence For The Gluon Content Of The Pomeron, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Diffractive Hard Photoproduction At Hera And Evidence For The Gluon Content Of The Pomeron, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Faculty Publications
Inclusive jet cross sections for events with a large rapidity gap with respect to the proton direction from the reaction ep → jet + X with quasi-real photons have been measured with the ZEUS detector. The cross sections refer to jets with transverse energies ETjet> 8 GeV. The data show the characteristics of a diffractive process mediated by pomeron exchange. Assuming that the events are due to the exchange of a pomeron with partonic structure, the quark and gluon content of the pomeron is probed at a scale ∼ (ETjet)2. A comparison of the measurements with model predictions based on …
The Archaeological Site Of Port Dauphin (1mb61): Its Role In The French Colony On Mobile Bay, George W. Shorter
The Archaeological Site Of Port Dauphin (1mb61): Its Role In The French Colony On Mobile Bay, George W. Shorter
LSU Historical Dissertations and Theses
The French colony in Louisiana resulted from the competition between France, Spain, and England for control of the region. France's interest, that began with the expedition of La Salle in 1682, resulted in the founding of the first French permanent colony on the Gulf coast by Iberville in 1699, Fort Maurepas. The colony was moved in 1702 to Mobile Bay. Mobile, the capital, was located 39 miles upriver for access to the Indian nations of the interior. Dauphin Island served as port. After two decades the colony was refocused on the Mississippi River, but the first 20 years of French …
Study Of The Photon Remnant In Resolved Photoproduction At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Study Of The Photon Remnant In Resolved Photoproduction At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Faculty Publications
Photoproduction at HERA is studied in ep collisions, with the ZEUS detector, for γp centre-of-mass energies ranging from 130-270 GeV. A sample of events with two high-pT jets (pT > 6 GeV, η < 1.6) and a third cluster in the approximate direction of the electron beam is isolated using a clustering algorithm. These events are mostly due to resolved photoproduction. The third cluster is identified as the photon remnant. Its properties, such as the transverse and longitudinal energy flows around the axis of the cluster, are consistent with those commonly attributed to jets, and in particular with those found for the two jets in these events. The mean value of the photon remnant pT with respect to the beam axis is measured to be 2.1 ± 0.2 GeV, which demonstrates substantial mean transverse momenta for the photon remnant. © 1995.
Louisiana Agriculture Magazine, Summer 1995, Lsu Agricultural Experiment Station
Louisiana Agriculture Magazine, Summer 1995, Lsu Agricultural Experiment Station
Louisiana Agriculture
No abstract provided.
Inclusive Transverse Momentum Distributions Of Charged Particles In Diffractive And Non-Diffractive Photoproduction At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Inclusive Transverse Momentum Distributions Of Charged Particles In Diffractive And Non-Diffractive Photoproduction At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Faculty Publications
Inclusive transverse momentum spectra of charged particles in photoproduction events in the laboratory pseudorapidity range -1.2<η<1.4 have been measured up to pT=8 GeV usign the ZEUS detector. Diffractive and non-diffractive reactions have been selected with an average γp centre of mass (c.m.) energy of 〈W〉=180 GeV. For diffractive reactions, the pT spectra of the photon dissociation events have been measured in two intervals of the dissociated photon mass with mean values 〈MX〉=5 GeV and 10 GeV. The inclusive transverse momentum spectra fall exponentially in the low pT region. The non-diffractive data show a pronounced high pT tail departing from the exponential shape. The pT distributions are compared to lower energy photoproduction data and to hadron-hadron collisions at a similar c.m. energy. The data are also compared to the results of a next-to-leading order QCD calculation. © 1995 Springer-Verlag.
Measurement Of The Cross Section For The Reaction Γp → J/Ψ P With The Zeus Detector At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Measurement Of The Cross Section For The Reaction Γp → J/Ψ P With The Zeus Detector At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Faculty Publications
This paper reports the cross section measurements for the process ep → e J/ψ p for Q2 < 4 GeV2 at s = 296 GeV, based on an integrated luminosity of about 0.5 pb-1, using the ZEUS detector. The J/ψ was detected in its e+e- and μ+μ- decay modes. The photoproduction cross section was measured to be 52-12+7 ± 10 nb at an average γp centre of mass energy of 67 GeV and 71-20+13±12 nb at 114 GeV. The significant rise of the cross section compared to lower energy measurements is not in agreement with VDM models, but can be described by QCD inspired models if a rise in the gluon momentum density at low x in the proton is assumed. © 1995.
Study Of D* (2010)± Production In Ep Collisions At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Study Of D* (2010)± Production In Ep Collisions At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Faculty Publications
We report the first observation of charmed mesons with the ZEUS detector at HERA using the decay channel D*+ → (D0 → K-π+)π+ (+c.c.). Clear signals in the mass difference ΔM=M(D*)-M(D0) as well as in the M(Kπ) distribution at the D0 mass are found. The ep cross section for inclusive D*± production with Q2 < 4 GeV2 in the γp centre-of-mass energy range 115 < W < 275 GeV has been determined to be (32±7-7+4) nb in the kinematic region pt(D*) ≥ 1.7 GeV, |η(D*)| < 1.5. Extrapolating outside this region, assuming a mass of the charm quark of 1.5 GeV, we estimate the ep charm cross section to be σ(ep → ccX) = (0.45 ± 0.11-0.22+0.37) μb at s=296 GeV and 〈W〉 = 198 GeV. The average γp charm cross section σ(γp → ccX) is found to be (6.3 ± 2.2-3.0+6.3) μb at 〈W〉 = 163 GeV and (16.9 ± 5.2-8.5+13.9) μb at 〈W〉 = 243 GeV. The increase of the total charm photoproduction cross section by one order of magnitude with respect to low energy data experiments is well described by QCD NLO calculations using singular gluon distributions in the proton. © 1995.
Dijet Cross Sections In Photoproduction At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Dijet Cross Sections In Photoproduction At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz
Faculty Publications
Dijet production by almost real photons has been studied at HERA with the ZEUS detector. Jets have been identified using the cone algorithm. A cut on xγOBS, the fraction of the photon energy participating in the production of the two jets of highest transverse energy, is used to define cross sections sensitive to the parton distributions in the proton and in the photon. The dependence of the dijet cross sections on pseudorapidity has been measured for xγOBS ≥ 0.75 and xγOBS < 0.75. The former is sensitive to the gluon momentum density in the proton. The latter is sensitive to the ginon in the photon. The cross sections are corrected for detector acceptance and compared to leading order QCD calculations. © 1995.
Louisiana Agriculture Magazine, Spring 1995, Lsu Agricultural Experiment Station
Louisiana Agriculture Magazine, Spring 1995, Lsu Agricultural Experiment Station
Louisiana Agriculture
No abstract provided.