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Title: Recent developments in Monte Carlo simulations, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Thompson, Jennifer M.
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: This talk outlines the current status of Monte Carlo simulations in particle physics. It demonstrates the implementation of automated NLO...
Show moreThis talk outlines the current status of Monte Carlo simulations in particle physics. It demonstrates the implementation of automated NLO contributions to matrix elements. The matching methods MC@NLO and POWHEG are outlined and results using various NLO tools are presented. The first plots from POWHEG showing the matching of NNLO matrix elements to the parton shower are also presented.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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$Diffraction at the LHC$

Title: Diffraction at the LHC, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Csanád, M.
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: Proton-proton collisions at the LHC can be classified as elastic, non-diffractive, and diffractive. In this paper we discuss various...
Show moreProton-proton collisions at the LHC can be classified as elastic, non-diffractive, and diffractive. In this paper we discuss various measurements of these above processes at various LHC experiments. We report about the total proton-proton cross-section measurements, about the analysis of diffractive events and also about the pseudorapidity distribution in inelastic events.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: Low-energy exclusive cross sections and inclusive production of identified charged hadrons with Babar, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Gary, J. William
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: Recent measurements of exclusive hadronic cross sections from the Babar Collaboration at SLAC are presented. Specifically, we present results...
Show moreRecent measurements of exclusive hadronic cross sections from the Babar Collaboration at SLAC are presented. Specifically, we present results on the e⁺e⁻ → K⁺K⁻(γ), p̅p, KₛKₗ, KₛKₗπ⁺π⁻ , KₛKₛπ⁺π⁻, and KₛKₛK⁺K⁻ cross sections performed using events with initial-state photon radiation, which allows the cross sections to be measured at low energy and over an extended energy range. In addition, we present results on the inclusive momentum spectra of identified charged pions, kaons, and protons at the fixed center-of-mass energy of 10.54 GeV, allowing new tests of QCD.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: Particle production at large momentum transfer, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Gonçalves, V.p., Sauter, Werner K.
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: Diffractive particle production in ep collisions and coherent pp interactions is studied assuming that the color singlet t channel exchange...
Show moreDiffractive particle production in ep collisions and coherent pp interactions is studied assuming that the color singlet t channel exchange carries large momentum transfer. The differential and total cross sections for vector meson and photon production are calculated using the non-forward solution of the LO and NLO BFKL equation at high energy and large momentum transfer and the predictions are compared with the DESY HERA data. Moreover, we estimate the rapidity distributions and total cross section for the J/Ψ and ρ production in coherent pp interactions at LHC energies. We predict large rates, which implies that the experimental identification can be feasible at the LHC.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: Large x physics: recent results and future plans, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Holt, Roy J.
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: The valence region is exceedingly important in hadron physics since this region not only defines a hadron but also is an excellent...
Show moreThe valence region is exceedingly important in hadron physics since this region not only defines a hadron but also is an excellent discriminator of nucleon structure models. Present uncertainties in light quark distribution functions at high x could also impact high energy physics. Here we will describe a new generation of experiments at Jefferson Lab that is aimed at the high x region of the nucleon. It is noted that the proposed Electron Ion Collider could explore the high x regime.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: Study of the helix model, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Todorova-nová, Ŝárka
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: The quantum properties of a helix-like shaped QCD string are studied in the context of the semi-classical Lund fragmentation model. It is...
Show moreThe quantum properties of a helix-like shaped QCD string are studied in the context of the semi-classical Lund fragmentation model. It is shown how simple quantization rules combined with the causality considerations in the string fragmentation process describe the mass hierarchy of light pseudoscalar mesons. The quantized helix string model predicts observable quantum effects related to the threshold behaviour of the intrinsic transverse momentum of hadrons, and of the minimal transverse momentum difference between adjacent hadrons.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: Measurement of the charged kaon correlations at small relative momentum in the SELEX experiment, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Nigmatkulov, Grigory
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: We report the first measurement of charged kaon Bose–Einstein correlations produced by 600 GeV/c Σ−, π− and 540 GeV/c p beams in the SELEX...
Show moreWe report the first measurement of charged kaon Bose–Einstein correlations produced by 600 GeV/c Σ−, π− and 540 GeV/c p beams in the SELEX experiment. The SELEX (E781) experiment at Fermilab is a fixed target three–stage magnetic spectrometer designed for study hadroproduction at high acceptance for forward interactions (xF ≥ 0.1). One–dimensional charged kaon correlation functions were obtained for all three beams and three pair transverse momentum ranges. The femtoscopic parameters for the radii and correlation strength of the kaon source were extracted. The fit results show the decrease of the emission source radii with the increase of the pair transverse momentum.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: Future physics: A personal view, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Bjorken, James
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: A personal view of the future of particle physics is presented.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne...
Show moreA personal view of the future of particle physics is presented.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: Kaon Freeze-out Dynamics in √sNN=200 GeV Au+Au Collisions at RHIC, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Šumbera, Michal
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: Measurements of three-dimensional correlation functions of like-sign low transverse momentum kaon pairs from Au+Au collisions at top RHIC...
Show moreMeasurements of three-dimensional correlation functions of like-sign low transverse momentum kaon pairs from Au+Au collisions at top RHIC energy √sNN =200 GeV are presented. The extracted kaon source function is narrower than the pion one and does not have the long tail along the pair transverse momentum direction. This indicates a much smaller role of long-lived resonance decays and/or of the emission duration on kaon emission. Three-dimensional Gaussian shape of the kaon source function can be adequately reproduced by Therminator simulations with resonance contributions taken into account. Comparison to pion data at the same energy reveals that the kaon Gaussian radii in the outward and sideward directions scale with the transverse mass mT. In the longitudinal direction, unlike at lower SPS energies, the Gaussian radii do not seem to follow the exact mT scaling between kaons and pions.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: Measurement of the strong coupling αS from the 3-jet rate in e⁺ e⁻ annihilation using JADE data, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Kluth, S.
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: We describe a measurement of the strong coupling αS(MZ₀ ) from the 3-jet rate in hadronic final states of e⁺ e⁻ annihilation recorded with the...
Show moreWe describe a measurement of the strong coupling αS(MZ₀ ) from the 3-jet rate in hadronic final states of e⁺ e⁻ annihilation recorded with the JADE detector at centre-of-mass energies of 14 to 44 GeV. The jets are reconstructed with the Durham jet clustering algorithm. The JADE 3-jet rate data are compared with QCD predictions in NNLO combined with resummed calculations. We find good agreement between the data and the prediction and extract αS(MZ₀ ) = 0.1199±0.0010(stat.)±0.0021(exp.)±0.0054(had.)±0.0007(theo.) .
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: Parton distributions and event generators, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Carrazza, Stefano, Forte, Stefano, Rojo, Juan
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: We present the implementation within the Pythia8 event generator of a set of parton distributions based on NNPDF methodology. We construct a...
Show moreWe present the implementation within the Pythia8 event generator of a set of parton distributions based on NNPDF methodology. We construct a set of leading-order parton distributions with QED corrections, NNPDF2.3QED LO set, based on the same data as the previous NNPDF2.3 NLO and NNLO PDF sets. We compare this PDF set to its higher-order counterparts, we discuss its implementation as an internal set in Pythia8, and we use it to study some of the phenomenological implications of photon-initiated contributions for dilepton production at hadron colliders.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: Overview of Higgs results from CMS, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Merkel, Petra
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
In this article we present an overview of...
Show moreSponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
In this article we present an overview of Higgs boson results from the CMS Collaboration as presented at the ISMD13 conference.
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Title: Measurement of hadron production in Deep Inelastic Scattering, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Jung, H.
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: Measurements of charged particle densities and K⁰s and Λ production in deep inelastic scattering at HERA are presented and compared to Monte...
Show moreMeasurements of charged particle densities and K⁰s and Λ production in deep inelastic scattering at HERA are presented and compared to Monte Carlo event generator predictions. The measurements provide sensitive tests for the initial state parton radiation process as well as for the hadronization process.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: Recent results from the search for the critical point of strongly interacting matter at the CERN SPS, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Seyboth, Peter
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: Recent searches at the CERN SPS for evidence of the critical point of strongly interacting matter are discussed. Experimental results on...
Show moreRecent searches at the CERN SPS for evidence of the critical point of strongly interacting matter are discussed. Experimental results on theroretically expected signatures, such as event-to-event fluctuations of the particle multiplicity and the average transverse momentum as well as intermittency in particle production are presented.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: Color reconnection and its effects on precise measurements at the LHC, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Sjöstrand, Torbjörn
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: There is experimental evidence for the occurrence of color reconnection, but the mechanisms involved are far from understood. Previous...
Show moreThere is experimental evidence for the occurrence of color reconnection, but the mechanisms involved are far from understood. Previous reconnection studies are briefly summarized, and some potential implications for LHC physics are outlined.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: Hadronic final states in high-pT QCD at CDF, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Matera, Keith
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: The heavy quark content associated with gauge boson production is of great interest to studies of QCD. These events probe the gluon and heavy...
Show moreThe heavy quark content associated with gauge boson production is of great interest to studies of QCD. These events probe the gluon and heavy-quark parton distribution functions of the proton, and also provide a measurement of the rate of final state gluon splitting to heavy favor. In addition, gauge boson plus heavy quark events are representative of backgrounds to Higgs, single top, and supersymmetric particle searches. Recent work with the CDF II detector at the Fermilab Tevatron has measured the cross-section of several gauge boson plus heavy flavor production processes, including the first Tevatron observation of specific charm process p͞p → W + c. Results are found to be in agreement with NLO predictions that include an enhanced rate of g → c͞c =b͞b splitting. Lastly, a new analysis promises to probe a lower pT (c) region than has yet been explored, by fully reconstructing D* → D^0 (Kπ)π decays in the full CDF dataset (9:7 fb^1).
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: Recent results on vector boson production in association with jets with the CMS detector, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Cornelis, Tom
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: The production of weak vector bosons in association with jets and their properties are intensively studied using proton-proton collision data...
Show moreThe production of weak vector bosons in association with jets and their properties are intensively studied using proton-proton collision data collected with the CMS detector. In this proceedings, we will show the cross section measurement of the electroweak production of a Z boson in association with 2 jets at √s = 8 TeV, including a new data-driven approach and studies on the hadronic activity in the region between the two tagging jets. The azimuthal correlations and event shapes in Z + jets events at √s= 7 TeV are also presented.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: Stochastic mechanism of color confinement, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Kuvshinov, V.
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: It is shown that in stochastic QCD a vacuum color quark is confined due to the interaction with environment, chaotic dynamics of Yang-Mills...
Show moreIt is shown that in stochastic QCD a vacuum color quark is confined due to the interaction with environment, chaotic dynamics of Yang-Mills-Higgsfields, decoherence of pure color state into mixed white (colorless) state and also squeezed, and entangled states appearance. Critical energy of order-chaos transition is obtained which depends on Higgs boson mass. Stochasticity is the root of color confinement disappearing of color at confinement radius.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: The phase diagram of QCD from lattice simulations, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: D'elia, Massimo
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: Numerical simulations of Quantum Chromodynamics on a space-time lattice represent the best non-perturbative tool to explore the QCD phase...
Show moreNumerical simulations of Quantum Chromodynamics on a space-time lattice represent the best non-perturbative tool to explore the QCD phase diagram and the behavior of strong interactions under extreme conditions. We review the present status of the field and discuss some recent results.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: The Tevatron energy scan: Findings & surprises, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Field, Rick
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: At CDF we study charged particle production (pT > 0.5 GeV/c, |η|
Show moreAt CDF we study charged particle production (pT > 0.5 GeV/c, |η| < 0.8) in proton-antiproton collisions at 300 GeV, 900 GeV, and 1.96 TeV. The 300 GeV and 900 GeV data are a result of the “Tevatron Energy Scan” which was performed just before the Tevatron was shut down. We use the direction of the leading charged particle in each event, PTmax, to define three regions of η-φ space; “toward,” “away,” and “transverse.” The “trans- verse” region is further divided into the “transMAX” and “transMIN” con- tributions. The “transMIN” region is very sensitive to the multiple parton interaction component (MPI) of the “underlying event,” while the “trans-DIF” (“transMAX” minus “transMIN”) is very sensitive to the initial and final-state radiation. This CDF analysis together with LHC data provides a detailed study the energy dependence of the various components of the “underlying event” in hadronic collisions.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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