Scaled momentum distributions for the strange hadrons K-S(0) and Lambda/(Lambda) over bar were measured in deep inelastic ep scattering with the ZEUS detector at HERA using an integrated luminosity of 330 pb(-1). The evolution of these distributions with h the photon virtuality, Q(2), was studied in the kinematic region 10 < Q(2) < 40000 CeV2 and 0.001 < x < 0.75, where x is the Bjorken scaling variable. Clear scaling violations are observed. Predictions based on different approaches to fragmentation were compared to the measurements. Leading-logarithm parton-shower Monte Carlo calculations interfaced to the Lund string fragmentation model describe the data reasonably well in the whole range measured. Next-to-leading-order QC[) calculations based on fragmentation functions, FFs, extracted front e(+)e(-) data alone, fail to describe the measurements. The calculations based on FFs extracted from a global analysis including e(+)e(-), ep and pp data give an improved description. The measurements presented in this paper have the potential to further constrain the FFs of quarks, anti-quarks and gluons yielding K-S(0) and Lambda/(Lambda) over bar strange hadrons.

Scaled momentum distributions for K-S(0) and Lambda/(Lambda)over-bar in DIS at HERA

BRUGNERA, RICCARDO;CARLIN, ROBERTO;GARFAGNINI, ALBERTO;A. Longhin;
2012

Abstract

Scaled momentum distributions for the strange hadrons K-S(0) and Lambda/(Lambda) over bar were measured in deep inelastic ep scattering with the ZEUS detector at HERA using an integrated luminosity of 330 pb(-1). The evolution of these distributions with h the photon virtuality, Q(2), was studied in the kinematic region 10 < Q(2) < 40000 CeV2 and 0.001 < x < 0.75, where x is the Bjorken scaling variable. Clear scaling violations are observed. Predictions based on different approaches to fragmentation were compared to the measurements. Leading-logarithm parton-shower Monte Carlo calculations interfaced to the Lund string fragmentation model describe the data reasonably well in the whole range measured. Next-to-leading-order QC[) calculations based on fragmentation functions, FFs, extracted front e(+)e(-) data alone, fail to describe the measurements. The calculations based on FFs extracted from a global analysis including e(+)e(-), ep and pp data give an improved description. The measurements presented in this paper have the potential to further constrain the FFs of quarks, anti-quarks and gluons yielding K-S(0) and Lambda/(Lambda) over bar strange hadrons.
2012
File in questo prodotto:
File Dimensione Formato  
unpaywall-bitstream-2125373186.pdf

accesso aperto

Tipologia: Published (Publisher's Version of Record)
Licenza: Creative commons
Dimensione 633.03 kB
Formato Adobe PDF
633.03 kB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2499879
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 4
  • ???jsp.display-item.citation.isi??? 1
  • OpenAlex 4
social impact