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Mid-rapidity Pion Cross Sections

Mid-rapidity Pion Cross Sections
Author:
Publisher:
Total Pages:
Release: 1981
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ISBN:

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Pion production by collisions of relativistic heavy ions has been studied recently by Wolf et al. For the reaction 1.05 GeV/A 4°Ar + Ca .-->. .pi./sup +/, they discovered a peak in the invariant cross section at mid-rapidity at P/sub perpendicular/ approx. 0.5 m/sub .pi./c. This peak is not apparent in the 730 MeV p/sup +/p data of Cochran et al. and was attributed to possible hydrodynamic flow effects. Several authors have suggested that the .pi./sup +/ peak is a Coulomb effect. These models predict the .pi.− would be drawn in towards the fireball, leaving an essentially flat distribution in the mid-rapidity region. Mid-rapidity .pi./sup +/ and .pi.− cross sections were measured using a 1.05 GeV/A argon beam with a calcium target. The pions were measured with a magnetic spectrometer set at 15° to the beam and were stopped in a scintillator range telescope. Results are presented and discussed. (WHK).


Charged-pion Cross Sections and Double-helicity Asymmetries in Polarized P+p Collisions at S

Charged-pion Cross Sections and Double-helicity Asymmetries in Polarized P+p Collisions at S
Author:
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Total Pages:
Release: 2015
Genre:
ISBN:

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In this paper, we present midrapidity charged-pion invariant cross sections, the ratio of the ?- to ?+ cross sections and the charge-separated double-spin asymmetries in polarized p+p collisions at s=200 GeV. While the cross section measurements are consistent within the errors of next-to-leading-order (NLO) perturbative quantum chromodynamics predictions (pQCD), the same calculations overestimate the ratio of the charged-pion cross sections. This discrepancy arises from the cancellation of the substantial systematic errors associated with the NLO-pQCD predictions in the ratio and highlights the constraints these data will place on flavor-dependent pion fragmentation functions. Lastly, the charge-separated pion asymmetries presented here sample an x range of 0̃.03–0.16 and provide unique information on the sign of the gluon-helicity distribution.


Parameterized Cross Sections for Pion Production in Proton-Proton Collisions

Parameterized Cross Sections for Pion Production in Proton-Proton Collisions
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
Total Pages: 86
Release: 2018-06-03
Genre:
ISBN: 9781720657910

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An accurate knowledge of cross sections for pion production in proton-proton collisions finds wide application in particle physics, astrophysics, cosmic ray physics, and space radiation problems, especially in situations where an incident proton is transported through some medium and knowledge of the output particle spectrum is required when given the input spectrum. In these cases, accurate parameterizations of the cross sections are desired. In this paper much of the experimental data are reviewed and compared with a wide variety of different cross section parameterizations. Therefore, parameterizations of neutral and charged pion cross sections are provided that give a very accurate description of the experimental data. Lorentz invariant differential cross sections, spectral distributions, and total cross section parameterizations are presented.Blattnig, Steve R. and Swaminathan, Sudha R. and Kruger, Adam T. and Ngom, Moussa and Norbury, John W. and Tripathi, R. K.Langley Research CenterPIONS; SCATTERING CROSS SECTIONS; PARTICLE PRODUCTION; PROTONS; PARTICLE COLLISIONS; PROTON-PROTON REACTIONS; SPECTRA; PARAMETERIZATION; EXTRATERRESTRIAL RADIATION; COSMIC RAYS; ASTROPHYSICS


Charged-pion Cross Sections and Double-helicity Asymmetries in Polarized [math Display

Charged-pion Cross Sections and Double-helicity Asymmetries in Polarized [math Display
Author:
Publisher:
Total Pages:
Release: 2015
Genre:
ISBN:

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In this paper, we present midrapidity charged-pion invariant cross sections, the ratio of the [pi]- to [pi]+ cross sections and the charge-separated double-spin asymmetries in polarized p+p collisions at s=200 GeV. While the cross section measurements are consistent within the errors of next-to-leading-order (NLO) perturbative quantum chromodynamics predictions (pQCD), the same calculations overestimate the ratio of the charged-pion cross sections. This discrepancy arises from the cancellation of the substantial systematic errors associated with the NLO-pQCD predictions in the ratio and highlights the constraints these data will place on flavor-dependent pion fragmentation functions. Lastly, the charge-separated pion asymmetries presented here sample an x range of ~0.03-0.16 and provide unique information on the sign of the gluon-helicity distribution.


Transversity 2008

Transversity 2008
Author: Ciullo Giuseppe
Publisher: World Scientific
Total Pages: 313
Release: 2009
Genre: Science
ISBN: 9814277789

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Transversity 2008, the second workshop on OC Transverse polarization phenomena in hard processesOCO follows the first one held in Como after three years. As in that case, the event comes at the end of a two-years project financed by the Italian Ministry of Education. In the time between the two Workshops, decisive steps towards the revealing of the transverse spin structure of the proton were taken on both the theoretical and experimental sides. The milestone of the first extraction of Transversity and the Sivers function for the u- and d-quarks deserves a special mention. In the same period, historic experiments that in the last decade contributed to the first pioneering measurements in the SIDIS sector, have concluded their data taking, and their place is being taken by upgrades of existing or new facilities. These are the result of the new interesting phenomena which are appearing and call for additional experimental information and novel experimental techniques. Over 80 physicists took part in the Workshop. Equally involved were experimentalists and theoreticians engaged in investigating the nature of transverse spin. The heterogeneous public favoured vivid discussions and fruitful exchange of up-to-date theoretical and experimental ideas on this constantly evolving subject."


Transversity 2005

Transversity 2005
Author: Dr. Vincenzo Barone
Publisher: World Scientific
Total Pages: 354
Release: 2006
Genre: Science
ISBN: 9812568468

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The notion of transversity in hadronic physics has been with us for over 25 years. Intriguing though it might have been, for much of that time transversity remained an intangible and remote object, of interest principally to a few theoreticians. In recent years transversity and transverse-spin effects in general have grown as both theoretical and experimental areas of active research. This increasing attention has now matured into a thriving field with a driving force of its own. The ever-growing bulk of data on asymmetries in collisions involving transversely polarised hadrons demands a more solid and coherent theoretical basis for its description. Indeed, it now appears rather clear that transversity and other closely related properties play a significant role in such phenomena.As part of a Ministry-funded inter-university Research Project, this workshop was organised to gather together experimentalists and theoreticians engaged in investigating the nature of transverse spin in hadronic physics, with the intent of favouring the exchange of up-to-date theoretical and experimental ideas and news on the subject. Over 70 physicists took part and very nearly all the major experiments involved in transverse-spin studies were officially represented, as too were the main theory groups working in the field. New results and new analyses sparked many interesting and lively discussions.


Pion and Kaon Lab Frame Differential Cross Sections for Intermediate Energy Nucleus-Nucleus Collisions

Pion and Kaon Lab Frame Differential Cross Sections for Intermediate Energy Nucleus-Nucleus Collisions
Author: National Aeronaut Administration (Nasa)
Publisher:
Total Pages: 28
Release: 2020-07-28
Genre:
ISBN:

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Space radiation transport codes require accurate models for hadron production in intermediate energy nucleus-nucleus collisions. Codes require cross sections to be written in terms of lab frame variables and it is important to be able to verify models against experimental data in the lab frame. Several models are compared to lab frame data. It is found that models based on algebraic parameterizations are unable to describe intermediate energy differential cross section data. However, simple thermal model parameterizations, when appropriately transformed from the center of momentum to the lab frame, are able to account for the data. Norbury, John W. and Blattnig, Steve R. Langley Research Center NASA/TP-2008-215544, L-19385 WBS 651549.02.07.01 MESONS; EXTRATERRESTRIAL RADIATION; SCATTERING CROSS SECTIONS; RADIATION TRANSPORT; NUCLEAR INTERACTIONS; PARAMETERIZATION; PIONS; HADRONS


Pion-proton Integral Cross Sections

Pion-proton Integral Cross Sections
Author: Brian Jeffrey Kriss
Publisher:
Total Pages: 476
Release: 1997
Genre: Cross sections (Nuclear physics)
ISBN:

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