Sea quark and gluon contents of light mesons at low Q2 scale

H. Nematollahi; M. M. Yazdanpanah

doi:10.1140/epjp/i2019-12844-2

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2024 Impact factor 2.9

EPJ PLUS - Condensed Matter and Complex Systems

Eur. Phys. J. Plus (2019) 134: 382
https://doi.org/10.1140/epjp/i2019-12844-2

Regular Article

Sea quark and gluon contents of light mesons at low Q² scale

H. Nematollahi¹^,2^* and M. M. Yazdanpanah¹^,2

¹ Faculty of physics, Shahid Bahonar University of Kerman, Kerman, Iran
² Mahani Mathematical Research Center, Shahid Bahonar University of Kerman, Kerman, Iran

^* e-mail: hnematollahi@uk.ac.ir

Received: 19 February 2019
Accepted: 5 June 2019
Published online: 8 August 2019

Abstract

We investigate the contributions of sea quarks and gluon to the structure of pion and kaon at low Q² scale. To this end, we calculate the sea quark and gluon distribution functions of these mesons applying the modified chiral quark model ( $\chi QM$ . We also compute the total momentum fraction which is carried by sea quarks and gluon in $\pi^{+}_{}$ and K⁺ mesons. It is found that sea quarks and gluon carry about 30% of total momentum of the light mesons at $ Q^2=0.25$ GeV^2. Furthermore, it is shown that the gluon contents of pion and kaon are different. On the other hand, we obtain the quark-anti quark asymmetry of the strange sea and down sea in $\pi^{+}_{}$ and K⁺, respectively. These asymmetries are determined based on the modified $\chi$ QM due to the chiral symmetry breaking.