Inclusive meson production in 3.5 GeV pp collisions studied with the HADES spectrometer

Rustamov, Anar

doi:10.1063/1.3483432

Title: Inclusive meson production in 3.5 GeV pp collisions studied with the HADES spectrometer

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Abstract

We present the inclusive di-electron invariant-mass spectrum from p+p interactions at 3.5 GeV kinetic beam energy. It is a very important reference for the study of vector meson production off the nucleus, recently investigated by HADES in p+{sup 93}Nb reactions at the same beam energy. Up to invariant masses of 0.6 GeV/c{sup 2} the main contributions to the e{sup +}e{sup -} spectrum are {pi}{sup 0},{eta}, {omega} and {Delta} Dalitz decays. In the vector-meson region a clear peak corresponding to the {omega} direct decay is reconstructed with {approx_equal}2% mass resolution. Subtracting this peak from the spectrum allows to investigate additional sources, in particular the {rho} meson. Indeed, the latest results from HSD and UrQMD calculations show different distributions for the shape of the {rho} meson at these energies. Therefore it is important to experimentally understand the production mechanism of the {rho} meson in elementary reactions. Besides the spectral shape of the mesons, their inclusive production cross sections are also not known at these energies. Due to the large and flat acceptance of the HADES spectrometer for e{sup +}e{sup -} masses above 0.2 GeV/c{sup 2} and for P{sub T}<1GeV/c, acceptance corrections are to a large extent model independent. This allows us tomore »« less

Authors:

Rustamov, Anar ^[1]

Helmholtzzentrum fuer Schwerionenforschung (GSI), Darmstadt (Germany)

Publication Date:: Thu Aug 05 00:00:00 EDT 2010

OSTI Identifier:: 21426491

Resource Type:: Journal Article

Journal Name:: AIP Conference Proceedings

Additional Journal Information:: Journal Volume: 1257; Journal Issue: 1; Conference: HADRON 2009: 13. international conference on hadron spectroscopy, Tallahassee, FL (United States), 29 Nov - 4 Dec 2009; Other Information: DOI: 10.1063/1.3483432; (c) 2010 American Institute of Physics; Journal ID: ISSN 0094-243X

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CHIRAL SYMMETRY; CROSS SECTIONS; ELECTRONS; ETA MESONS; GEV RANGE; MASS RESOLUTION; MASS SPECTRA; MULTIPARTICLE SPECTROMETERS; NIOBIUM 93 TARGET; OMEGA-782 MESONS; PARTICLE DECAY; PARTICLE PRODUCTION; PIONS NEUTRAL; POSITRONS; PROTON REACTIONS; PROTON-PROTON INTERACTIONS; QUANTUM CHROMODYNAMICS; REST MASS; RHO-770 MESONS; ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; BARYON REACTIONS; BARYON-BARYON INTERACTIONS; BOSONS; CHARGED-PARTICLE REACTIONS; DECAY; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; FIELD THEORIES; HADRON REACTIONS; HADRON-HADRON INTERACTIONS; HADRONS; INTERACTIONS; LEPTONS; MASS; MATTER; MEASURING INSTRUMENTS; MESONS; NUCLEAR REACTIONS; NUCLEON REACTIONS; NUCLEON-NUCLEON INTERACTIONS; PARTICLE INTERACTIONS; PIONS; PROTON-NUCLEON INTERACTIONS; PSEUDOSCALAR MESONS; QUANTUM FIELD THEORY; RESOLUTION; SPECTRA; SPECTROMETERS; SYMMETRY; TARGETS; VECTOR MESONS

Citation Formats


                    Rustamov, Anar. Inclusive meson production in 3.5 GeV pp collisions studied with the HADES spectrometer.  United States: N. p., 2010. 
        Web.  doi:10.1063/1.3483432.

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                    Rustamov, Anar. Inclusive meson production in 3.5 GeV pp collisions studied with the HADES spectrometer.  United States.  https://doi.org/10.1063/1.3483432

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                    Rustamov, Anar. 2010.  
        "Inclusive meson production in 3.5 GeV pp collisions studied with the HADES spectrometer".  United States.  https://doi.org/10.1063/1.3483432.

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@article{osti_21426491,

  title        = {Inclusive meson production in 3.5 GeV pp collisions studied with the HADES spectrometer},

  author       = {Rustamov, Anar},

  abstractNote = {We present the inclusive di-electron invariant-mass spectrum from p+p interactions at 3.5 GeV kinetic beam energy. It is a very important reference for the study of vector meson production off the nucleus, recently investigated by HADES in p+{sup 93}Nb reactions at the same beam energy. Up to invariant masses of 0.6 GeV/c{sup 2} the main contributions to the e{sup +}e{sup -} spectrum are {pi}{sup 0},{eta}, {omega} and {Delta} Dalitz decays. In the vector-meson region a clear peak corresponding to the {omega} direct decay is reconstructed with {approx_equal}2% mass resolution. Subtracting this peak from the spectrum allows to investigate additional sources, in particular the {rho} meson. Indeed, the latest results from HSD and UrQMD calculations show different distributions for the shape of the {rho} meson at these energies. Therefore it is important to experimentally understand the production mechanism of the {rho} meson in elementary reactions. Besides the spectral shape of the mesons, their inclusive production cross sections are also not known at these energies. Due to the large and flat acceptance of the HADES spectrometer for e{sup +}e{sup -} masses above 0.2 GeV/c{sup 2} and for P{sub T}<1GeV/c, acceptance corrections are to a large extent model independent. This allows us to extract the preliminary inclusive cross section values for the meson productions at these energies.},

  doi          = {10.1063/1.3483432},

  url          = {https://www.osti.gov/biblio/21426491},
  journal      = {AIP Conference Proceedings},

  issn         = {0094-243X},

  number       = 1,

  volume       = 1257,

  place        = {United States},

  year         = {Thu Aug 05 00:00:00 EDT 2010},

  month        = {Thu Aug 05 00:00:00 EDT 2010}

}

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