Effects of Overlapping Strings in pp Collisions

Abstract

In models for hadron collisions based on string hadronization, the strings are usually treated as independent, allowing no interaction between the confined colour fields. In studies of nucleus collisions it has been suggested that strings close in space can fuse to form "colour ropes". Such ropes are expected to give more strange particles and baryons, which also has been suggested as a signal for plasma formation. Overlapping strings can also be expected in pp collisions, where usually no phase transition is expected. In particular at the high LHC energies the expected density of strings is quite high. To investigate possible effects of rope formation, we present a model in which strings are allowed to combine into higher multiplets, giving rise to increased production of baryons and strangeness, or recombine into singlet structures and vanish. Also a crude model for strings recombining into junction structures is considered, again giving rise to increased baryon production. The models are implemented in the DIPSY MC event generator, using PYTHIA 8 for hadronization, and comparison to pp minimum bias data, reveals improvement in the description of identified particle spectra.

48 pages, 22 figures

References in corpus (2)

• PYTHIA 6.4 Physics and Manual
• Herwig++ Physics and Manual

Cited by in corpus (7)

• Diffractive and non-diffractive wounded nucleons and final states in pA collisions
• Quark number scaling of hadronic $p_T$ spectra and constituent quark degree of freedom in $p$-Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV
• Hyperfine splitting effects in string hadronization
• Status and developments of event generators
• Colour Reconnection at Future ${\mathrm{e}}^{+}{\mathrm{e}}^{-}$ Colliders
• Total, inelastic and (quasi-)elastic cross sections of high energy pA and gamma-A reactions with the dipole formalism
• Multiparton interactions: From pp to pA