Production of f0(980) meson at the LHC: Color evaporation versus color-singlet gluon-gluon fusion
The production of the f0(980) meson at high energies is not well understood. We investigate two different potential mechanisms for inclusive scalar meson production in the kt-factorization approach: color-singlet gluon-gluon fusion and color evaporation model. The γ⁎γ⁎→f0(980) form factor(s) can be...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020-07-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269320302793 |
| _version_ | 1818151358934548480 |
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| author | Piotr Lebiedowicz Rafał Maciuła Antoni Szczurek |
| author_facet | Piotr Lebiedowicz Rafał Maciuła Antoni Szczurek |
| author_sort | Piotr Lebiedowicz |
| collection | DOAJ |
| description | The production of the f0(980) meson at high energies is not well understood. We investigate two different potential mechanisms for inclusive scalar meson production in the kt-factorization approach: color-singlet gluon-gluon fusion and color evaporation model. The γ⁎γ⁎→f0(980) form factor(s) can be constraint from the f0(980) radiative decay width. The g⁎g⁎→f0(980) form factors are obtained by a replacement of αem electromagnetic coupling constant by αs strong coupling constant and appropriate color factors. The form factors for the two couplings are parametrized with a function motivated by recent results for scalar quarkonia. The differential cross sections are calculated in the kt-factorization approach with modern unintegrated gluon distributions. Unlike for quarkonia it seems rather difficult to describe a preliminary ALICE data for inclusive production of f0(980) exclusively by the color singlet gluon-gluon fusion mechanism. Two different scenarios for flavor structure of f0(980) are considered in this context. We consider also mechanism of fusion of quark-antiquark associated with soft gluon emission in a phenomenological color evaporation model (CEM) used sometimes for quarkonium production. Here we use kt-factorization version of CEM to include higher-order contributions. In addition, for comparison we consider also NLO collinear approach with qq¯q and qq¯g color octet partonic final states. Both approaches lead to a similar result. However, very large probabilities are required to describe the preliminary ALICE data. The pomeron-pomeron fusion mechanism is also discussed and results are quantified. |
| first_indexed | 2024-12-11T13:37:34Z |
| format | Article |
| id | doaj.art-ec8257177b254ef6bde257c1f637b7c8 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-12-11T13:37:34Z |
| publishDate | 2020-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-ec8257177b254ef6bde257c1f637b7c82022-12-22T01:04:57ZengElsevierPhysics Letters B0370-26932020-07-01806135475Production of f0(980) meson at the LHC: Color evaporation versus color-singlet gluon-gluon fusionPiotr Lebiedowicz0Rafał Maciuła1Antoni Szczurek2Corresponding author.; Institute of Nuclear Physics Polish Academy of Sciences, ul. Radzikowskiego 152, PL-31342 Kraków, PolandInstitute of Nuclear Physics Polish Academy of Sciences, ul. Radzikowskiego 152, PL-31342 Kraków, PolandInstitute of Nuclear Physics Polish Academy of Sciences, ul. Radzikowskiego 152, PL-31342 Kraków, PolandThe production of the f0(980) meson at high energies is not well understood. We investigate two different potential mechanisms for inclusive scalar meson production in the kt-factorization approach: color-singlet gluon-gluon fusion and color evaporation model. The γ⁎γ⁎→f0(980) form factor(s) can be constraint from the f0(980) radiative decay width. The g⁎g⁎→f0(980) form factors are obtained by a replacement of αem electromagnetic coupling constant by αs strong coupling constant and appropriate color factors. The form factors for the two couplings are parametrized with a function motivated by recent results for scalar quarkonia. The differential cross sections are calculated in the kt-factorization approach with modern unintegrated gluon distributions. Unlike for quarkonia it seems rather difficult to describe a preliminary ALICE data for inclusive production of f0(980) exclusively by the color singlet gluon-gluon fusion mechanism. Two different scenarios for flavor structure of f0(980) are considered in this context. We consider also mechanism of fusion of quark-antiquark associated with soft gluon emission in a phenomenological color evaporation model (CEM) used sometimes for quarkonium production. Here we use kt-factorization version of CEM to include higher-order contributions. In addition, for comparison we consider also NLO collinear approach with qq¯q and qq¯g color octet partonic final states. Both approaches lead to a similar result. However, very large probabilities are required to describe the preliminary ALICE data. The pomeron-pomeron fusion mechanism is also discussed and results are quantified.http://www.sciencedirect.com/science/article/pii/S0370269320302793 |
| spellingShingle | Piotr Lebiedowicz Rafał Maciuła Antoni Szczurek Production of f0(980) meson at the LHC: Color evaporation versus color-singlet gluon-gluon fusion Physics Letters B |
| title | Production of f0(980) meson at the LHC: Color evaporation versus color-singlet gluon-gluon fusion |
| title_full | Production of f0(980) meson at the LHC: Color evaporation versus color-singlet gluon-gluon fusion |
| title_fullStr | Production of f0(980) meson at the LHC: Color evaporation versus color-singlet gluon-gluon fusion |
| title_full_unstemmed | Production of f0(980) meson at the LHC: Color evaporation versus color-singlet gluon-gluon fusion |
| title_short | Production of f0(980) meson at the LHC: Color evaporation versus color-singlet gluon-gluon fusion |
| title_sort | production of f0 980 meson at the lhc color evaporation versus color singlet gluon gluon fusion |
| url | http://www.sciencedirect.com/science/article/pii/S0370269320302793 |
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