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The resonance production in proton$-$proton collisions at $\sqrt{s}$ = 7 TeV and 13 TeV have been investigated using Pythia 8 event generator within the framework of microscopic processes like color reconnection and rope hadronization.…

High Energy Physics - Phenomenology · Physics 2019-11-05 Ankita Goswami , Ranjit Nayak , Basanta Kumar Nandi , Sadhana Dash

Strange hadron production in pp collisions at $\sqrt{s}~=~7$ TeV is studied in jets and underlying events using the PYTHIA8 event generator. Matching strange hadrons to the jet area and the underlying event area is expected to help us…

High Energy Physics - Phenomenology · Physics 2022-03-28 Pengyao Cui , Zhongbao Yin , Liang Zheng

In relativistic heavy-ion collisions, the formation of a deconfined and thermalized state of partons, known as quark-gluon plasma (QGP), leads to enhanced production of strange hadrons in contrast to proton-proton (pp) collisions, which are…

High Energy Physics - Phenomenology · Physics 2025-04-08 Suraj Prasad , Bhagyarathi Sahoo , Sushanta Tripathy , Neelkamal Mallick , Raghunath Sahoo

Data from the LHC show a rise in strange-hadron production with charged-particle multiplicity in pp collisions. The Monte-Carlo event generator PYTHIA, using its default Monash tune, instead predicts constant strangeness. We investigate a…

High Energy Physics - Phenomenology · Physics 2026-03-02 Javira Altmann , Lorenzo Bernardinis , Peter Skands , Valentina Zaccolo

We present a systematic study on the strange particle production at the Large Hadron Collider (LHC) in proton-proton (pp) collisions at $\sqrt{s}=$ 7 TeV based on PACIAE simulations. Two different mechanisms accounting for single string…

High Energy Physics - Phenomenology · Physics 2018-10-02 Liang Zheng , Dai-Mei Zhou , Zhong-Bao Yin , Yu-Liang Yan , Gang Chen , Xu Cai , Ben-Hao Sa

We revisit our rope model for string fragmentation that has been shown to give a reasonable description of strangeness and baryon enhancement in high-multiplicity pp events at the LHC. A key feature of the model is that the enhancement is…

High Energy Physics - Phenomenology · Physics 2022-08-17 Christian Bierlich , Smita Chakraborty , Gösta Gustafson , Leif Lönnblad

It has been proposed to search for thermal and collective properties arising from parton-fragmentation processes by examining high jet charged-constituent multiplicities ($N_{\rm j,ch}$) in proton-proton (pp) collisions. This proposal was…

High Energy Physics - Phenomenology · Physics 2025-08-27 Robert Vertesi , Antonio Ortiz

In the colour string picture with fusion and percolation it is shown that long range azimuthal-rapidity correlations (ridge) can arise from the superposition of many events with exchange of clusters of different number of strings and not…

High Energy Physics - Phenomenology · Physics 2015-06-22 M. A. Braun , C. Pajares , V. V. Vechernin

String Fusion Model Code results for Pb--Pb central collisions at SPS energies including the string fusion interaction mechanism are compared to the last experimental data. Predictions for RHIC energies are also presented. On the other…

High Energy Physics - Phenomenology · Physics 2008-11-26 E. G. Ferreiro , C. Pajares

Enhanced production of hadrons with $s$-quark content has been observed in $pp$ collisions at LHC, and earlier in collisions of heavy nuclei. We review the string hadronisation formalism and correc- tions from rope hadronisation and colour…

High Energy Physics - Phenomenology · Physics 2016-07-01 Christian Bierlich

We present a comparison between two recently developed colour reconnection models, the new colour reconnection model in PYTHIA and the DIPSY rope hadronization model. Specifically we investigate ratios of identified hadron yields as a…

High Energy Physics - Phenomenology · Physics 2016-10-31 Christian Bierlich , Jesper Roy Christiansen

Stimulated by the keen interest of possible collective behavior in high-energy proton-proton and proton-nucleus collisions, we study two-particle angular correlations in pseudorapidity and azimuthal differences in simulated p + p…

Nuclear Theory · Physics 2025-02-28 Manuel Sebastian Torres , Yicheng Feng , Fuqiang Wang

We give a reminder on the major inputs of microscopic hadronic transport models and on the physics aims when describing various aspects of relativistic heavy ion collisions at SPS energies. We then first stress that the situation of…

Nuclear Theory · Physics 2009-11-07 Carsten Greiner

We present a systematic study on the strange and multi-strange particles production in Pb+Pb collisions at $\sqrt{S_{NN}} = 2.76$ TeV based on the PACIAE model simulations. Two different mechanisms, namely the single string structure…

Nuclear Theory · Physics 2020-10-21 Dai-Mei Zhou , Liang Zheng , Zhi-Hong Song , Yu-Liang Yan , Gang Chen , Xiao-Mei Li , Xu Cai , Ben-Hao Sa

Correlations between particles separated by several units of pseudorapidity were discovered in high-multiplicity pp and p-Pb collisions at the LHC. These long-range structures observed in two-particle correlation functions are reminiscent…

Nuclear Experiment · Physics 2019-01-04 Alice Ohlson

These proceedings summarise recent measurements of angular correlations between the $\Xi$ baryon and identified hadrons in pp collisions at $\sqrt{s}=13\,\mathrm{TeV}$ using the ALICE detector. The results are compared with both…

High Energy Physics - Experiment · Physics 2022-02-16 Jonatan Adolfsson

QCD strings originate from high-energy scattering in the form of Reggeons and Pomerons, and have been studied in some detail in lattice numerical simulations. Production of multiple strings, with their subsequent breaking, is now a…

High Energy Physics - Phenomenology · Physics 2015-08-05 Ioannis Iatrakis , Adith Ramamurti , Edward Shuryak

We define a new set of observables to probe the structure of the underlying event in hadron collisions. We use the conventional definition of the `transverse region' in jet events and, for a fixed window in jet $p_\perp$, propose to measure…

High Energy Physics - Phenomenology · Physics 2016-06-01 Tim Martin , Peter Skands , Sinead Farrington

Strangeness enhancement is considered as a potential signature for QGP phase transition. Here we claim the observation of strangeness enhancement in proton-proton (pp) collisions at RHIC energy saying the de-confinement phase is reached.…

High Energy Physics - Experiment · Physics 2025-12-24 Fatma. H. Sawy

Multi-Parton Interactions (MPI) in pp collisions have attracted the attention of the heavy-ion community since they can help to elucidate the origin of collective-like effects discovered in small collision systems at the LHC. In this work,…

High Energy Physics - Phenomenology · Physics 2020-10-28 Antonio Ortiz , Antonio Paz , Jose D. Romo , Sushanta Tripathy , Erik A. Zepeda , Irais Bautista