Is the X(3872) a bound state ?

Abstract

All existing experimental evidence of the bound state nature of the $X(3872)$ relies on considering its decay products with a finite experimental spectral mass resolution which is typically $\Delta m\ge 2$MeV and much larger than its alleged binding energy, $B_X=0.00(18)$MeV. On the other hand, we have found recently that there is a neat cancellation in the $1^{++}$ channel for the invariant $D{\bar{D}}^{\ast }$ mass around the threshold between the continuum and bound state contribution. This is very much alike a similar cancellation in the proton-neutron continuum with the deuteron in the $1^{++}$ channel. Based on comparative fits of experimental cross section deuteron and $X(3872)$ prompt production in pp collisions data with a finite $p_T$ to a common Tsallis distribution we find a strong argument questioning the bound state nature of the state but also explaining the large observed production rate likely consistent with a half-bound state.

arXiv comment6 pages, 4 figures, 1 table

References in corpus (31)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Brief Introduction to PYTHIA 8.1
• Observation of a New Narrow Charmonium State in Exclusive B+-->K+ pi+pi- J/psi Decays
• Observation of a narrow charmonium-like state in exclusive B+ -> K+ pi+pi- J/psi decays
• Hadronic molecules
• Multiquark Resonances
• Decoding the phase structure of QCD via particle production at high energy
• From the Deuteron to Deusons, an Analysis of Deuteronlike Meson-Meson Bound States
• Determination of the X(3872) meson quantum numbers
• The D*0 D0bar threshold resonance
• Couplings in coupled channels versus wave functions: application to the X(3872) resonance
• Low-energy Universality and the New Charmonium Resonance at 3870 MeV
• Relativistic Thermodynamics: Transverse Momentum Distributions in High-Energy Physics
• A nonextensive thermodynamical equilibrium approach in $e^{+}{e}^{-}\to hadrons$
• Cluster Formation and The Virial Equation of State of Low-Density Nuclear Matter
• Bounds on the width, mass difference and other properties of X(3872) --> pi+pi-J/psi decays
• Coarse grained Potential analysis of neutron-proton and proton-proton scattering below pion production threshold
• Loosely-bound objects produced in nuclear collisions at the LHC
• Non-extensive statistics, fluctuations and correlations in high energy nuclear collisions
• Production of deuterons, tritons, ${}^3$He nuclei and their anti-nuclei in pp collisions at $\sqrt{\text{s}}$ = 0.9, 2.76 and 7 TeV
• Search for a Charged Partner of the X(3872) in the B Meson Decay B --> X- K, X- --> J/psi pi- pi0
• Different pole structures in line shapes of the $X(3872)$
• The observation of light nuclei at ALICE and the X(3872) conundrum
• Novel Method for Precisely Measuring the $X(3872)$ Mass
• Measurements of the absolute branching fractions of $B^{+}\to X_{c\bar{c}}{K}^{+}$ and $B^{+}\to {\bar{D}}^{(\ast )0}{\pi }^{+}$ at Belle
• Quark Hadron Duality at Finite Temperature
• Implicit vs Explicit Renormalization and Effective Interactions
• Counting states and the Hadron Resonance Gas: Does X(3872) count?
• Non-extensivity of the QCD pT spectra
• Quark properties from the Hadron Resonance Gas

Cited by in corpus (4)

• Measurements of the Absolute Branching Fractions of $B^{\pm }\to K^{\pm }{X}_{c\bar{c}}$
• Status and Prospects of Exotic Hadrons at Belle II
• QFT treatment of a bound state in a thermal gas
• On the precise measurement of the $X(3872)$ mass and its counting rate