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.

H. ABRAMOWICZ, I. ABT, L. ADAMCZYK, M. ADAMUS, R. AGGARWA, S. ANTONELLI, et al. (2012). Scaled momentum distributions for K0_s and Lambda/Anti-Lambda in DIS at HERA. JOURNAL OF HIGH ENERGY PHYSICS, 1203, 020-1-020-31 [10.1007/JHEP03(2012)020].

Scaled momentum distributions for K0_s and Lambda/Anti-Lambda in DIS at HERA.

BASILE, MAURIZIO;CIFARELLI, LUISA;CONTIN, ANDREA;SARTORELLI, GABRIELLA;
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
H. ABRAMOWICZ, I. ABT, L. ADAMCZYK, M. ADAMUS, R. AGGARWA, S. ANTONELLI, et al. (2012). Scaled momentum distributions for K0_s and Lambda/Anti-Lambda in DIS at HERA. JOURNAL OF HIGH ENERGY PHYSICS, 1203, 020-1-020-31 [10.1007/JHEP03(2012)020].
H. ABRAMOWICZ; I. ABT; L. ADAMCZYK; M. ADAMUS; R. AGGARWA; S. ANTONELLI; P. ANTONIOLI; A. ANTONOV; M. ARNEODO; V. AUSHEV; Y. AUSHEV; O. BACHYNSKA; A. ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/118585
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