Light isovector resonances in ${\pi }^{-}p\to {\pi }^{-}{\pi }^{-}{\pi }^{+}p$ at 190 GeV/$c$

Abstract

We have performed the most comprehensive resonance-model fit of ${\pi }^{-}{\pi }^{-}{\pi }^{+}$ states using the results of our previously published partial-wave analysis (PWA) of a large data set of diffractive-dissociation events from the reaction ${\pi }^{-}+p\to {\pi }^{-}{\pi }^{-}{\pi }^{+}+p_{\text{recoil}}$ with a 190 GeV/$c$ pion beam. The PWA results, which were obtained in 100 bins of three-pion mass, $0.5<m_{3\pi }<2.5$ GeV/$c^2$, and simultaneously in 11 bins of the reduced four-momentum transfer squared, $0.1<t^{\prime }<1.0$ $($GeV$/c{)}^2$, are subjected to a resonance-model fit using Breit-Wigner amplitudes to simultaneously describe a subset of 14 selected waves using 11 isovector light-meson states with $J^{PC}=0^{-+}$, $1^{++}$, $2^{++}$, $2^{-+}$, $4^{++}$, and spin-exotic $1^{-+}$ quantum numbers. The model contains the well-known resonances $\pi (1800)$, $a_1(1260)$, $a_2(1320)$, ${\pi }_2(1670)$, ${\pi }_2(1880)$, and $a_4(2040)$. In addition, it includes the disputed ${\pi }_1(1600)$, the excited states $a_1(1640)$, $a_2(1700)$, and ${\pi }_2(2005)$, as well as the resonancelike $a_1(1420)$. We measure the resonance parameters mass and width of these objects by combining the information from the PWA results obtained in the 11 $t^{\prime }$ bins. We extract the relative branching fractions of the $\rho (770)\pi$ and $f_2(1270)\pi$ decays of $a_2(1320)$ and $a_4(2040)$, where the former one is measured for the first time. In a novel approach, we extract the $t^{\prime }$ dependence of the intensity of the resonances and of their phases. The $t^{\prime }$ dependence of the intensities of most resonances differs distinctly from the $t^{\prime }$ dependence of the nonresonant components. For the first time, we determine the $t^{\prime }$ dependence of the phases of the production amplitudes and confirm that the production mechanism of the Pomeron exchange is common to all resonances.

arXiv comment224 pages, 172 figures

References in corpus (59)

• Hadronic molecules
• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• QCD and strongly coupled gauge theories: challenges and perspectives
• The COMPASS Experiment at CERN
• The Physics of the B Factories
• UNDERSTANDING THE SCALAR MESON $q\bar{q}$ NONET
• Higher Quarkonia
• The Status of Glueballs
• Inclusive Measurement of Diffractive Deep-inelastic ep Scattering
• Coupled $\pi \pi ,K\overline{K}$ scattering in $P$-wave and the $\rho$ resonance from lattice QCD
• Hybrid Mesons
• Evidence for Exotic Meson Production in the Reaction ${\pi }^{-}p\to \eta {\pi }^{-}p$ at 18 GeV/c
• The Experimental Status of Glueballs
• Resonance Parameters of the rho-Meson from Lattice QCD
• Resonances in coupled $\pi K,\eta K$ scattering from lattice QCD
• Hybrid Meson Decay Phenomenology
• Observation of a J^PC = 1-+ exotic resonance in diffractive dissociation of 190 GeV/c pi- into pi- pi- pi+
• Searching for observable effects induced by anomalous triangle singularities
• Hadronic Structure in the Decay ${\tau }^{-}\to {\nu }_{\tau }{\pi }^{-}{\pi }^0{\pi }^0$ and the Sign of the Tau Neutrino Helicity
• Observation of exotic meson production in the reaction ${\pi }^{-}p\to {\eta }^{\prime }{\pi }^{-}p$ at 18 GeV/c
• Exotic Meson Production in the $f_1(1285){\pi }^{-}$ System observed in the Reaction ${\pi }^{-}p\to \eta {\pi }^{+}{\pi }^{-}{\pi }^{-}p$ at 18 GeV/c
• On the nature of $a_1(1420)$
• Exotic Meson Decay to $\omega {\pi }^0{\pi }^{-}$
• The COMPASS Setup for Physics with Hadron Beams
• Odd and Even Partial Waves of $\eta {\pi }^{-}$ and ${\eta }^{\prime }{\pi }^{-}$ in ${\pi }^{-}p\to {\eta }^{(\prime )}{\pi }^{-}p$ at $191\text{GeV}/c$
• Evidence for Exotic J^{PC}=1^{-+} Meson Production in the Reaction pi- p --> eta pi- p at 18 GeV/c
• The Status of Exotic-quantum-number Mesons
• Observation of a new narrow axial-vector meson $a_1(1420)$
• K pi scattering and the K* decay width from lattice QCD
• Nature of the light scalar mesons
• The "$a_1(1420)$" peak as the $\pi f_0(980)$ decay mode of the $a_1(1260)$
• Partial wave analysis of pbar-p annihilation channels in flight with I=1, C=+1
• POMWIG : HERWIG for diffractive interactions
• Measurement of K^+K^- production in two-photon collisions in the resonant-mass region
• Resonance Production and $\pi \pi$ S-wave in ${\pi }^{-}+p\to {\pi }^{-}{\pi }^{-}{\pi }^{+}+p_{recoil}$ at 190 GeV/c
• Confirmation of a pi_1^0 Exotic Meson in the ηπ^0 System
• First Results from The GlueX Experiment
• A partial wave analysis of the ${\pi }^{-}{\pi }^{-}{\pi }^{+}$ and ${\pi }^{-}{\pi }^0{\pi }^0$ systems and the search for a $J^{PC}=1^{-+}$ meson
• A search for J^{PC}=1^{-+} exotic mesons in the pi- pi- pi+ and pi- pi0 pi0 systems
• A partial wave analysis of the ${\pi }^0{\pi }^0$ system produced in ${\pi }^{-}p$ charge exchange collisions
• Amplitude analyses of the decays chi_c1 -> eta pi+ pi- and chi_c1 -> eta' pi+ pi-
• Search for the photo-excitation of exotic mesons in the pi+pi+pi- system
• The JPC=1-+ hunting season at VES
• A partial wave analysis of pbar-p -> eta-eta-pizero
• On the nature of the $π_2(1880)
• $a_1(1420)$ resonance as a tetraquark state and its isospin partner
• Test of the multiquark structure of $a_1(1420)$ in strong two-body decays
• Tetraquarks in holographic QCD
• Peak locations and relative phase of different decay modes of the $a_1$ axial vector resonance in diffractive production
• New analysis of $\eta \pi$ tensor resonances measured at the COMPASS experiment
• $a_1(1260),a_1(1420)$ and the production in heavy meson decays
• Measurement of radiative widths of $a_2(1320)$ and ${\pi }_2(1670)$
• On the Partial-Wave Analysis of Mesonic Resonances Decaying to Multiparticle Final States Produced by Polarized Photons
• A fresh look at eta2(1645), eta2(1870), eta2(2030) and f2(1910) in pbar-p -> eta + 3pizero
• Study of reaction pi- A --> pi+pi-pi- A at VES setup
• Amplitude analysis of resonant production in three pions
• The twofold emergence of the $a_1$ axial vector meson in high energy hadronic production
• Light axial-vector tetraquark state candidate: $a_1(1420)$
• Study of pbar-p -> eta-eta-pizero-pizero in flight

Cited by in corpus (39)

• An updated review of the new hadron states
• 50 Years of Quantum Chromodynamics
• Determination of the pole position of the lightest hybrid meson candidate
• Masses of ground-state mesons and baryons, including those with heavy quarks
• PANDA Phase One
• Light-Meson Spectroscopy with COMPASS
• Novel approaches in Hadron Spectroscopy
• Axial-vector transition form factors and $e^{+}{e}^{-}\to f_1{\pi }^{+}{\pi }^{-}$
• Pole position of the $a_1(1260)$ resonance in a three-body unitary framework
• Pole position of the $a_1(1260)$ from $\tau$-decay
• Towards the establishment of the light $J^{P(C)}=1^{-(+)}$ hybrid nonet
• Triangle Singularity as the Origin of the $a_1(1420)$
• The phenomenology of the exotic hybrid nonet with ${\pi }_1(1600)$ and ${\eta }_1(1855)$
• Dalitz plots and lineshape of $a_1(1260)$ from a relativistic three-body unitary approach
• QCD axial anomaly enhances the $\eta {\eta }^{\prime }$ decay of the hybrid candidate ${\eta }_1(1855)$
• $1^{-+}$ Hybrid in $J/\psi$ Radiative Decays from Lattice QCD
• The exotic meson ${\pi }_1(1600)$ with $J^{PC}=1^{-+}$ and its decay into $\rho (770)\pi$
• Bound states in the B-matrix formalism for the three-body scattering
• Spectral functions of nucleon form factors: Three-pion continua at low energies
• Constructing the $J^{P(C)}=1^{-(+)}$ light flavor hybrid nonet with the newly observed ${\eta }_1(1855)$
• Analysis of rescattering effects in $3\pi$ final states
• Investigation of Mass and Decay Characteristics of the All-light Tetraquark
• Radiative production and decays of the exotic ${\eta }_1^{\prime }(1855)$ and its siblings
• Light double-gluon hybrid states from QCD sum rules
• Role of the triangle mechanism in the ${\Lambda }_b\to {\Lambda }_c{\pi }^{-}{f}_0(980)$ reaction
• Ordinary and exotic mesons in the extended Linear Sigma Model
• Kinematical higher-twist corrections in ${\gamma }^{\ast }\to M_1{M}_2\gamma$: Neutral meson production
• Fully-strange tetraquark states with the exotic quantum numbers $J^{PC}=0^{+-}$ and $2^{+-}$
• Light double-gluon hybrid states with the exotic quantum numbers $J^{PC}=1^{-+}$ and $3^{-+}$
• The decay $\tau \to K^{\ast 0}(892)K^{-}{\nu }_{\tau }$ in the extended NJL model
• Partial wave analysis of ${\tau }^{-}\to {\pi }^{-}{\pi }^{+}{\pi }^{-}{\nu }_{\tau }$ at Belle
• Decay properties of light $1^{-+}$ hybrids
• Gravitational form factors in the perturbative limit
• $\tau \to {\nu }_{\tau }{\rho }^0{\pi }^{-}$ decay in the Nambu - Jona-Lasinio model
• Recent progress in the partial-wave analysis of the diffractively produced ${\pi }^{-}{\pi }^{+}{\pi }^{-}$ final state at COMPASS
• Freed-Isobar Analysis of Light Mesons at COMPASS
• Charge asymmetry in the process $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\pi }^0\gamma$
• Measurement of the presence of ${\mathrm{a}}_1(1420)$ and $\omega (782)$ in ${\tau }^{-}\to {\pi }^{-}{\pi }^{-}{\pi }^{+}{\nu }_{\tau }$ at Belle
• Investigation of the Lightest Hybrid Meson Candidate with a Coupled-Channel Analysis of $\bar{p}p$-, ${\pi }^{-}p$- and $\pi \pi$-Data