Measurement of the Antiquark Flavor Asymmetry in the Nucleon Sea - INSPIRE

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Measurement of the Antiquark Flavor Asymmetry in the Nucleon Sea

Rusty Shane Towell
(
- Texas U.
)

May, 2001

127 pages

Supervisors:

L. Donald Isenhower
(
- Texas U.
)
,
Peter J. Riley
(
- Texas U.
)

Thesis: PhD

Texas U.

(2001)

e-Print:

nucl-ex/0102012 [nucl-ex]

DOI:

Report number:

FERMILAB-THESIS-1999-26,
UMI-99-47415

Experiments:

FNAL-E-0866

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Abstract:

A precise measurement of the ratio of Drell-Yan yields from an 800 GeV/c pro- ton beam incident on liquid hydrogen and deuterium targets is reported. Over 370,000 Drell-Yan muon pairs were recorded. From these data, the ratio of anti- down (

\bar{d}

) to anti-up (

\bar{u}

) quark distributions in the proton sea is determined over a wide range in Bjorken -

x

. A strong

x

dependence is observed in the ratio

\bar{d}

=

\bar{u}

. From this result, the integral of (

\bar{d} - \bar{u}

) is evaluated for 0.015 <

x

< 0.35 and compared with deep inelastic scattering results. The origin of this asymmetry is probably due to non-perturbative effects such as those contained in pion cloud models. This measurement has instigated new global fits since previous parameterizations of the proton could not accommodate this large asymmetry

physics of elementary particles and fields
thesis
p p: inclusive reaction
p deuteron: inclusive reaction
muon: pair production
Drell-Yan process
channel cross section: ratio
nucleon: structure function
antiquark: sea
flavor: asymmetry

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