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in subjects: "Scattering Experiment-Hep"

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Measurement of the differential cross section $d\sigma/dt$ in elastic $p\bar{p}$ scattering at $\sqrt{s}=1.96$ TeV

We present a measurement of the elastic differential cross section differential cross section d{sigma}(p{bar p}{yields}p{bar p})/dt as a function of the four-momentum-transfer squared t. The data sample corresponds to an integrated luminosity of {approx}31 nb{sup -1} collected with the D0 detector using dedicated Tevatron p{bar p} Collider operating conditions at {radical}s = 1.96 TeV and covers the range 0.26 < |t| < 1.2 GeV{sup 2}. For |t| < 0.6 GeV{sup 2}, d{sigma}/dt is described b… more

Date: June 1, 2012

Creator: Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Measurement of the Cross Section for Prompt Isolated Diphoton Production in $p\bar{p}$ Collisions at \sqrt s = 1.96 TeV

This article reports a measurement of the cross section of prompt isolated photon pair production in p{bar p} collisions at a total energy {radical}s = 1.96 TeV using data of 5.36 fb{sup -1} integrated luminosity collected with the CDF II detector at the Fermilab Tevatron. The measured cross section, differential in basic kinematic variables, is compared with three perturbative QCD predictions, a leading order (LO) parton shower calculation and two next-to-leading order (NLO) calculations. The … more

Date: September 1, 2011

Creator: Vellidis, Costas

Item Type: Article

Partner: UNT Libraries Government Documents Department

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D^* production in deep-inelastic scattering at low Q^2

Inclusive production of D* mesons in deep-inelastic scattering at HERA is studied in the range 5 < Q{sup 2} < 100 GeV{sup 2} of the photon virtuality and 0.02 < y < 0.70 of the inelasticity of the scattering process. The visible range for the D* meson is p{sub T} (D*) > 1.25 GeV and |{eta}(D*)| < 1.8. The data were taken with the H1 detector in the years 2004 to 2007 and correspond to an integrated luminosity of 347 pb{sup -1}. Single and double differential cross sections are… more

Date: July 1, 2011

Creator: Jung, Andreas W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The MINERvA Experiment

The MINERvA experiment is a dedicated cross-section experiment whose aim is to measure neutrino cross sections for inclusive and exclusive final states on several nuclei. The detector is fully commissioned and began running in March 2010. As a dedicated cross-section experiment, MINERvA has a particular need to know the incident neutrino flux: both the absolute level and the energy dependence. In these proceedings we describe the MINERvA detector, give an update on the experimental status, and … more

Date: March 18, 2011

Creator: Harris, Deborah A. & Kopp, Sacha

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Neutrino-nucleus interactions

The study of neutrino oscillations has necessitated a new generation of neutrino experiments that are exploring neutrino-nuclear scattering processes. We focus in particular on charged-current quasi-elastic scattering, a particularly important channel that has been extensively investigated both in the bubble-chamber era and by current experiments. Recent results have led to theoretical reexamination of this process. We review the standard picture of quasi-elastic scattering as developed in elec… more

Date: January 1, 2011

Creator: Gallagher, H.; Garvey, G. & Zeller, G. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

SciNOvA: A Measurement of Neutrino-Nucleus Scattering in a Narrow-Band Beam

We propose to construct and deploy a fine-grained detector in the Fermilab NOvA 2 GeV narrow-band neutrino beam. In this beam, the detector can make unique contributions to the measurement of quasi-elastic scattering, neutral-current elastic scattering, neutral-current {pi}{sup 0} production, and enhance the NOvA measurements of electron neutrino appearance. To minimize cost and risks, the proposed detector is a copy of the SciBar detector originally built for the K2K long baseline experiment a… more

Date: October 15, 2010

Creator: Paley, J.; Djurcic, Z.; Harris, D.; Tesarek, R.; Feldman, G.; Corwin, L. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Bigger, Better, Faster, More at the LHC

Multijet plus missing energy searches provide universal coverage for theories that have new colored particles that decay into a dark matter candidate and jets. These signals appear at the LHC further out on the missing energy tail than two-to-two scattering indicates. The simplicity of the searches at the LHC contrasts sharply with the Tevatron where more elaborate searches are necessary to separate signal from background. The searches presented in this article effectively distinguish signal fr… more

Date: August 26, 2010

Creator: Izaguirre, Eder; /SLAC; Manhart, Michael; /Rutgers U., Piscataway; Wacker, Jay G. & /SLAC

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Searches for New Neutral Gauge Bosons and Leptoquarks at the Tevatron

This contribution reports on some of the most recent searches for new heavy neutral bosons and leptoquarks performed at the Tevatron experiments.

Date: March 1, 2010

Creator: Safonov, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Experimental probes of axions

Experimental searches for axions or axion-like particles rely on semiclassical phenomena resulting from the postulated coupling of the axion to two photons. Sensitive probes of the extremely small coupling constant can be made by exploiting familiar, coherent electromagnetic laboratory techniques, including resonant enhancement of transitions using microwave and optical cavities, Bragg scattering, and coherent photon-axion oscillations. The axion beam may either be astrophysical in origin as in… more

Date: October 1, 2009

Creator: Chou, Aaron S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Exclusive High Mass Di-leptons in CDF

In the Collider Detector at Fermilab, CDF, we have measured central exclusive production, p + {bar p} {yields} p + X + {bar p}, where X is a pair of leptons or photons and nothing else. In this talk I focus on central masses M(X) > 8 GeV/c{sup 2}. We measured QED production {gamma}{gamma} {yields} e{sup +}e{sup -}, {mu}{sup +}{mu}{sup -} up to M(X) = 75 GeV/c{sup 2}, and candidates for photoproduction of Upsilons, {gamma} IP {yields} Y (1S), Y (2S), Y (3S). I report a search for exclusive ph… more

Date: September 1, 2009

Creator: Albrow, Michael

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Search for New Physics in the B(s) Sector at the Tevatron

While B{sup 0} and B{sup +} mesons are well studied at B-factories, large samples of B{sub s}{sup 0} mesons are only available at the Tevatron so far. Since the B{sub s}{sup 0} meson consists of quarks of the second and third generation it provides a complementary probe for searches for new physics effects. Results of the CDF and D0 experiments on the decays B{sub s}{sup 0} {yields} {mu}{sup +}{mu}{sup -} and B{sub s}{sup 0} {yields} {mu}{sup +}{mu}{sup -}{phi} as well as on CP violation in B{s… more

Date: July 1, 2009

Creator: Kuhr, Thomas

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Photon + jets at D0

Photon plus jet production has been studied by the D0 experiment in Run II of the Fermilab Tevatron Collider at a centre of mass energy of {radical}s = 1.96 TeV. Measurements of the inclusive photon, inclusive photon plus jet, photon plus heavy flavour jet cross sections and double parton interactions in photon plus three jet events are presented. They are based on integrated luminosities between 0.4 fb{sup -1} and 1.0 fb{sup -1}. The results are compared to perturbative QCD calculations in var… more

Date: June 1, 2009

Creator: Sonnenschein, Lars & U., /RWTH Aachen

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Properties of Exotic Charmonium-like States at CDF

We report the recent evidence for a new narrow structure, Y (4140), decaying to the J/{psi}{phi} final state, in exclusive B{sup +} {yields} J/{psi}{phi}K{sup +} decays in a data sample corresponding to an integrated luminosity of 2.7 fb{sup -1} collected at the CDF II detector. This narrow structure with its mass well above open charm pairs is unlikely to be a candidate for a conventional charmonium state. From a study of the X(3872) mass and width based on the world's largest sample of X(3872… more

Date: June 1, 2009

Creator: Yi, Kai

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Studying neutrino oscillations using quasi-elastic events in MINOS

MINOS (Main Injector Neutrino Oscillation Search), is a long baseline neutrino experiment designed to search for neutrino oscillations using two detectors at Fermi National Accelerator Laboratory, IL (Near Detector) and Soudan, MN (Far Detector). It will study {nu}{sub {mu}} {yields} {nu}{sub {tau}} oscillations and make a measurement on the oscillation parameters, {Delta}m{sub 23}{sup 2} and sin{sup 2} 2{theta}{sub 23}, via a {nu}{sub {mu}} beam made at Fermilab. Charge current neutrino intera… more

Date: February 1, 2008

Creator: Kumaratunga, Sujeewa Terasita

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

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Exclusive Hadronic Final States in E+ E- Interactions at BaBar

The first observation of e{sup +}e{sup -} annihilation into states of positive C parity, {rho}{sup 0}{rho}{sup 0} and {phi}{phi}{sup 0} is reported. It is shown that these final states are produced through two-virtual-photon annihilation. this is based on the distributions of cos{theta}*, where {theta}* is the center-of-mass polar angle of {phi} or {rho}{sup 0}. The cross sections for the |cos{theta}*| < 0.8 are measured. In addition, the observation of another channel, e{sup +}e{sup -} {yie… more

Date: December 5, 2007

Creator: Saremi, Sepehr

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Measurement of Muon Neutrino Quasi-Elastic Scattering on Carbon

Low energy (200 < E{sub v} < 2000 MeV) neutrino oscillation experiments, including MiniBooNE, require a model of charged current quasi-elastic (CCQE) neutrino interactions to predict signal samples. Using a high-statistics sample of muon neutrino CCQE events, MiniBooNE finds that a simple Fermi gas model, with appropriate adjustments, accurately characterizes the CCQE events observed in a carbon-based detector. The extracted parameters include an effective axial mass, M{sub A} = 1.23 {+-}… more

Date: June 1, 2007

Creator: Aguilar-Arevalo, A. A.; Bazarko, A. O.; Brice, S. J.; Brown, B. C.; Bugel, L.; Cao, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Study of the S-wave K(pi) --> Amplitude Using the Decay D+ --> K-pi+pi+

In this work the S-wave component of the K{pi} amplitude from decay of D{sup +} {yields} K{sup -}{pi}{sup +}{pi}{sup +} it is directly measured. The data come from the Fermilab E831/FOCUS experiment. The amplitude measurement is made using the partial wave analysis without any preliminary assumption about the nature of the S-wave component of the K{pi} system. The phase and magnitude of the S-wave amplitude are generic functions to be determined directly through the Dalitz plot fit. For the sak… more

Date: February 1, 2007

Creator: Machado, Ana Amelia Bergamini

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

open access

Neutrino scattering physics and experiments at super beams and neutrino factories

A careful study of neutrino scattering physics is an essential part of the program to answer many open questions being addressed by several different physics communities. A deeper understanding of nuclear effects induced by neutrinos and considerably more accurate measurements of neutrino exclusive cross sections is crucial for minimizing systematics of neutrino oscillation experiments. In addition, the knowledge gained by neutrino scattering experiments is important to the Nuclear Physics and … more

Date: January 1, 2006

Creator: Morfin, J.G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Model independent measurement of S-wave K- pi+ systems using D+ ---> K pi pi decays from Fermilab E791

A model-independent partial-wave analysis of the S-wave component of the K{pi} system from decays of D{sup +} mesons to the three-body K{sup -}{pi}{sup +}{pi}{sup +} final state is described. Data come from the Fermilab E791 experiment. Amplitude measurements are made independently for ranges of K{sup -}{pi}{sup +} invariant mass, and results are obtained below 825 MeV/c{sup 2}, where previous measurements exist only in two mass bins. This method of parametrizing a three-body decay amplitude re… more

Date: July 1, 2005

Creator: Aitala, E. M.; Amato, S.; Anjos, J. C.; Appel, J. A.; Ashery, D.; Banerjee, S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Amplitude Analysis of the Decay $D_s^+ \to \pi^+ \pi^- \pi^+$ in the Experiment E831/FOCUS

We present in this thesis the Dalitz Plot analysis of the D{sub s}{sup +} {yields} {pi}{sup +}{pi}{sup -}{pi}{sup +} decay, with the data of the E831/FOCUS, that took data in 1996 and 1997. The masses and widhts of f{sub 0}(980) and f{sub 0}(1370) are free parametres of the fit on Dalitz Plot, objectiving to study in detail these resonances. After this analysis we present the Spectator Model study on the S wave in this decay. For this study we used the formalism developed by M. Svec [2] for sca… more

Date: January 1, 2005

Creator: Schilithz, Anderson Correa

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Status of diffractive physics at D0 Run II

The Forward Proton Detector (FPD) is a new sub-system of the D0 detector implemented for Run II at the Fermilab Tevatron which gives access to a wide range of diffractive scattering physics processes. This new detector is described and preliminary results from the diffractive program are presented.

Date: January 1, 2005

Creator: Strang, M. & /Texas U., Arlington

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Measurements of bottom anti-bottom azimuthal production correlations in proton - anti-proton collisions at s**(1/2) = 1.8-TeV

The authors have measured the azimuthal angular correlation of b{bar b} production, using 86.5 pb{sup -1} of data collected by Collider Detector at Fermilab (CDF) in p{bar p} collisions at {radical}s = 1.8 TeV during 1994-1995. In high-energy p{bar p} collisions, such as at the Tevatron, b{bar b} production can be schematically categorized into three mechanisms. The leading-order (LO) process is ''flavor creation'', where both b and {bar b} quarks substantially participate in the hard scatterin… more

Date: December 1, 2004

Creator: Acosta, D.; Affolder, Anthony A.; Albrow, M. G.; Ambrose, D.; Amidei, D.; Anikeev, K. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Elastic and diffractive scattering at D0

The first search for diffractively produced Z bosons in the muon decay channel is presented, using a data set collected by the D0 detector at the Fermilab Tevatron at {radical}s = 1.96 TeV between April and September 2003, corresponding to an integrated luminosity of approximately 110 pb{sup -1}. The first dN/d|t| distribution for proton-antiproton elastic scattering at this c.o.m. energy is also presented, using data collected by the D0 Forward Proton Detector between January and May 2002. The… more

Date: April 1, 2004

Creator: Edwards, Tamsin

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Measurement of y-Distributions for High Energy Antineutrino Scattering in Hydrogen-Neon

Distributions in the scaling variable y are presented based on a study of approximately 700 antineutrino events in the energy range 10-200 GeV obtained using the Fermilab 15-ft bubble chamber filled with a light Hydrogen-Neon mixture. The distributions are inconsistent with a (1 -y){sup 2} form predicted by the simple quark parton model of the nucleon without antiquarks, but can be well fitted assuming a relative antiquark contribution of (10 {+-} 5)%. For small values of the Bjorken scaling va… more

Date: January 1, 1976

Creator: Berge, J. P.; DiBianca, F. A.; Hanft, R.; Nezrick, F. A.; Scott, W. G.; Smart, Wesley M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department