Speaker
Description
The multipomeron exchange model was considered earlier in papers [1 – 5]. Within the framework of this model, it was possible to successfully describe the charged multiplicity (Nch), mean transverse momentum (pt) and pt-Nch correlations in pp and pp¯ collisions over a wide energy range (from ISR to LHC). It allowed also to reproduce the growth of the yields of strange, multi-strange and charm particles as a function of multiplicity for pp, p-Pb and Pb-Pb collisions at the LHC energy. For this, in particular, the general idea of the Schwinger mechanism of particle production from a string [6] was used, where the transverse momentum distribution of charged particles from a string has a Gaussian form, and in case of string overlap the effective string tension was related to the number of strings. However, experimental data show that the pt-spectra of particles produced in pp collisions are better described by the thermal model. To solve this problem, we introduced the thermal-like pt distribution function which can be considered as averaging out over string tension fluctuations [7]. We calculated pt-spectra and pt-Nch correlations functions for pp-collisions at the LHC energy in extended multipomeron exchange model and compared the results with the experimental data.
The research was supported by the SPbSU project, No 93025435.
- Armesto N., Derkach D.A., Feofilov G.A. p(t)-multiplicity correlations in a multi-Pomeron-exchange model with string collective effects. Phys. Atom. Nucl. 2008, 71, 2087–2095.
- Bodnia E., Derkach D., Feofilov G., Kovalenko V., Puchkov A. Multi-pomeron exchange model for pp and pp¯ collisions at ultra-high energy. PoS QFTHEP2013 2013, 60.
- Kovalenko V.N., Puchkov A.M., Feofilov G.A. Production of strange particles in a multi-pomeron exchange model. Bull. Russ. Acad. Sci. Phys. 2016, 80, 966–969.
- Feofilov G., Kovalenko V., Puchkov A. Correlation between heavy flavour production and multiplicity in pp and p-Pb collisions at high energy in the multi-pomeron exchange model. EPJ Web Conf. 2018, 171, 18003.
- Kovalenko V., Feofilov G., Puchkov A., Valiev F. Multipomeron Model with Collective Effects for High-Energy Hadron Collisions. Universe 2022, 8, 246. https://doi.org/10.3390/universe8040246
- Schwinger J.S. On gauge invariance and vacuum polarization. Phys. Rev. 1951, 82, 664–679.
- Bialas A. Fluctuations of the string tension and transverse mass distribution. Phys. Lett. B 1999, 466, 301–304.
