Precision spectroscopy with COMPASS and the observation of a new iso-vector resonance

Stephan Paul

doi:10.1051/epjconf/20147303002

Precision spectroscopy with COMPASS and the observation of a new iso-vector resonance

Stephan Paul

Chair of Physics I

Cluster of Excellence E-conversion

Research output: Contribution to journal › Conference article › peer-review

3 Scopus citations

Abstract

We report on the results of a novel partial-wave analysis based on 50 ? 10⁶ events from the reaction π^- + p → π^-π^-π⁺ + p_recoil at 190? GeV/c incoming beam momentum using the COMPASS spectrometer. A separated analysis in bins of m_3π and four-momentum transfer t′ reveals the interference of resonant and non-resonant particle production and allows their spectral separation. Besides well known resonances we observe a new iso-vector meson a₁(1420) at a mass of 1420? MeV/c² in the f₀(980)π final state only, the origin of which is unclear. We have also examined the structure of the 0⁺⁺ππ-isobar in the J^PC = 0^-+, 1⁺⁺, 2^-+ three pion waves. This clearly reveals the various 0⁺⁺ππ-isobar components and its correlation to the decay of light mesons.

Original language	English
Article number	03002
Journal	EPJ Web of Conferences
Volume	73
DOIs	https://doi.org/10.1051/epjconf/20147303002
State	Published - 2014
Event	13th International Conference Meson-Nucleon Physics and the Structure of the Nucleon, MENU 2013 - Rome, Italy Duration: 30 Sep 2013 → 4 Oct 2013

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title = "Precision spectroscopy with COMPASS and the observation of a new iso-vector resonance",

abstract = "We report on the results of a novel partial-wave analysis based on 50 ? 106 events from the reaction π- + p → π-π-π+ + precoil at 190? GeV/c incoming beam momentum using the COMPASS spectrometer. A separated analysis in bins of m3π and four-momentum transfer t′ reveals the interference of resonant and non-resonant particle production and allows their spectral separation. Besides well known resonances we observe a new iso-vector meson a1(1420) at a mass of 1420? MeV/c2 in the f0(980)π final state only, the origin of which is unclear. We have also examined the structure of the 0++ππ-isobar in the JPC = 0-+, 1++, 2-+ three pion waves. This clearly reveals the various 0++ππ-isobar components and its correlation to the decay of light mesons.",

author = "Stephan Paul",

year = "2014",

doi = "10.1051/epjconf/20147303002",

language = "English",

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journal = "EPJ Web of Conferences",

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T1 - Precision spectroscopy with COMPASS and the observation of a new iso-vector resonance

AU - Paul, Stephan

PY - 2014

Y1 - 2014

N2 - We report on the results of a novel partial-wave analysis based on 50 ? 106 events from the reaction π- + p → π-π-π+ + precoil at 190? GeV/c incoming beam momentum using the COMPASS spectrometer. A separated analysis in bins of m3π and four-momentum transfer t′ reveals the interference of resonant and non-resonant particle production and allows their spectral separation. Besides well known resonances we observe a new iso-vector meson a1(1420) at a mass of 1420? MeV/c2 in the f0(980)π final state only, the origin of which is unclear. We have also examined the structure of the 0++ππ-isobar in the JPC = 0-+, 1++, 2-+ three pion waves. This clearly reveals the various 0++ππ-isobar components and its correlation to the decay of light mesons.

AB - We report on the results of a novel partial-wave analysis based on 50 ? 106 events from the reaction π- + p → π-π-π+ + precoil at 190? GeV/c incoming beam momentum using the COMPASS spectrometer. A separated analysis in bins of m3π and four-momentum transfer t′ reveals the interference of resonant and non-resonant particle production and allows their spectral separation. Besides well known resonances we observe a new iso-vector meson a1(1420) at a mass of 1420? MeV/c2 in the f0(980)π final state only, the origin of which is unclear. We have also examined the structure of the 0++ππ-isobar in the JPC = 0-+, 1++, 2-+ three pion waves. This clearly reveals the various 0++ππ-isobar components and its correlation to the decay of light mesons.

UR - https://www.scopus.com/pages/publications/84903455174

U2 - 10.1051/epjconf/20147303002

DO - 10.1051/epjconf/20147303002

M3 - Conference article

AN - SCOPUS:84903455174

SN - 2101-6275

VL - 73

JO - EPJ Web of Conferences

JF - EPJ Web of Conferences

M1 - 03002

T2 - 13th International Conference Meson-Nucleon Physics and the Structure of the Nucleon, MENU 2013

Y2 - 30 September 2013 through 4 October 2013

ER -

Precision spectroscopy with COMPASS and the observation of a new iso-vector resonance

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