Estimating the Production Rate of Loosely-bound Hadronic Molecules using Event Generators

Abstract

We examine the use of hadronic event generators, such as Pythia or Herwig, to estimate the production rate of loosely-bound hadronic molecules, such as the deuteron and the X(3872). In the case of the deuteron, we point out that there are large uncertainties in the normalization of the predictions using event generators, because baryon pair distributions are not among the inputs used to tune the event generators. Predictions using Pythia for anti-deuteron production in Upsilon decay are compared to measurements by the CLEO Collaboration. They suggest that Pythia overpredicts the probability of producing pairs of baryons, at least in Upsilon decay into three gluons, and that the standard value of the coalescence parameter underpredicts the probability for formation of a deuteron from a neutron and proton with small relative momentum. In the case of the X(3872), we discuss a proposed upper bound on the prompt cross section at the Tevatron that has been used as an argument against the X(3872) being a loosely-bound charm meson molecule. We demonstrate that this proposed upper bound is invalid by showing that the analogous upper bound for the anti-deuteron would be smaller than the observed anti-deuteron cross section.

22 pages, 3 figures, corrected typos

References in corpus (22)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• Observation and Properties of the X(3872) Decaying to J/psi pi+ pi- in p-p(bar) Collisions at sqrt(s) = 1.96 TeV
• The Exotic XYZ Charmonium-like Mesons
• Analysis of the Quantum Numbers $J^{PC}$ of the X(3872) Particle
• Is the X(3872) Production Cross Section at Tevatron Compatible with a Hadron Molecule Interpretation?
• Evidence for the decay X(3872) --> J/psi omega
• Observation of a Near-threshold $D^0{\bar{D}}^0{\pi }^0$ Enhancement in $B\to D^0{\bar{D}}^0{\pi }^{0}K$ Decay
• Production of the X(3872) at the Tevatron and the LHC
• A study of B->X(3872) K, with X(3872)->J/Psi pi+ pi-
• Precision Measurement of the X(3872) Mass in J/psi pi+ pi- Decays
• Flux of light antimatter nuclei near earth, induced by Cosmic Rays in the Galaxy and in the atmosphere
• Antideuteron and antihelion production in root(s) = 130 GeV Au+Au collisions
• Deuteron and antideuteron production in Au+Au collisions at sqrt(s_NN)=200 GeV
• Deuteron and Anti-deuteron Production in e+e- Collisions at the Z Resonance
• Enhanced anti-deuteron Dark Matter signal and the implications of PAMELA
• General Analysis of Antideuteron Searches for Dark Matter
• Anti-Deuteron Production in Upsilon(nS) Decays and the Nearby Continuum
• The X(3872) at CDF II
• More loosely bound hadron molecules at CDF?
• Inclusive Production of the X(3872)
• Measurement of (anti)deuteron and (anti)proton production in DIS at HERA

Cited by in corpus (44)

• Hadronic molecules
• The $XYZ$ states: experimental and theoretical status and perspectives
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• Electron-Ion Collider in China
• Four-Quark Hadrons: an Updated Review
• Diquark Correlations in Hadron Physics: Origin, Impact and Evidence
• Testing coalescence and statistical-thermal production scenarios for (anti-)(hyper-)nuclei and exotic QCD objects at energies available at the CERN Large Hadron Collider
• Selected Science Opportunities for the EicC
• The observation of light nuclei at ALICE and the X(3872) conundrum
• The nature of $X(3872)$ from high-multiplicity $pp$ collisions
• A Mechanism for Hadron Molecule Production in p pbar(p) Collisions
• Deciphering the nature of X(3872) in heavy ion collisions
• On $X(3872)$ production in high energy heavy ion collisions
• Production of Tetraquarks at the LHC
• The QCD Dynamics of Tetraquark Production
• $X(3872)$ production and absorption in a hot hadron gas
• Production of the bottom analogues and the spin partner of the X(3872) at hadron colliders
• Novel approaches in Hadron Spectroscopy
• Note on X(3872) production at hadron colliders and its molecular structure
• Production of charged heavy quarkonium-like states at the LHC and the Tevatron
• Production of exotic hadrons in $pp$ and nuclear collisions
• Hunting for the X_b via Radiative Decays
• Tetraquark Cusp Effects from Diquark Pair Production
• Hunting for the $X_b$ via hidden bottomonium decays
• Prompt production of the hidden charm pentaquarks in the LHC
• Constraints from precision measurements on the hadron-molecule interpretation of X,Y,Z resonances
• Semi-inclusive lepto-production of hidden-charm exotic hadrons
• Flavor Physics at the CEPC: a General Perspective
• XYZ spectroscopy at electron-hadron facilities II: Semi-inclusive processes with pion exchange
• Are the XYZ states unconventional states or conventional states with unconventional properties?
• Antideuterons from Decaying Gravitino Dark Matter
• Semi-inclusive electroproduction of hidden-charm and double-charm hadronic molecules
• Exotic Hadron Bound State Production at Hadronic Colliders
• Production and absorption of exotic bottomonium-like states in high energy heavy ion collisions
• Production of $X_b$ via ${\rm Y}(5S,6S)$ radiative decays
• Search for $C=+$ charmonium and XYZ states in $e^{+}{e}^{-}\to \gamma +H$ at BESIII
• A New Dynamical Picture for the Production and Decay of the $XYZ$ Mesons
• Hunting for $X_b$ via hidden bottomonium decays $X_b\to \pi \pi {\chi }_{bJ}$
• $Z_b(10610)$ in a hadronic medium
• XYZ spectroscopy at electron-hadron facilities III: Semi-inclusive processes with vector exchanges
• The Delta-Statistics of Uncoventional Quarkonium-like Resonances
• Production of loosely-bound hadron molecules from bottomonium decays
• Production of hidden-heavy and double-heavy hadronic molecules at the $Z$ factory of CEPC
• Production of exotic hadrons at hadron colliders