Light-flavor sea-quark distributions in the nucleon in the SU(3) chiral quark soliton model. I. Phenomenological predictions

Wakamatsu, M.

doi:10.1103/physrevd.67.034005

Cited by 55 publications

(14 citation statements)

References 77 publications

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“…A compilation of theoretical predictions is given in Peng (2003). Meson cloud models predict small negative isospin asymmetries in the polarized sea (Cao and Signal, 2001;Kumano and Miyama, 2002) whereas statistical (Bourrely et al, 2002) and chiral quark soliton models (Wakamatsu, 2003) predict positive values. The COM-PASS and HERMES results are consistent with these predictions within uncertainties.…”

Section: A Valence and Sea Polarizationmentioning

confidence: 99%

The Spin Structure of the Nucleon

Aidala,

Bass,

Hasch

et al. 2012

Preprint

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Section: A Valence and Sea Polarizationmentioning

confidence: 99%

The Spin Structure of the Nucleon

Aidala,

Bass,

Hasch

et al. 2012

Preprint

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“…The Nambu-JonaLasinio (NJL) model [99,100], based on a local four-fermion interaction with U(1)×SU(2) L ×SU(2) R chiral symmetry, is a popular choice for studies of nucleon structure functions [101,102,103] [101,102]; the blue solid line is a prediction from an SU(3)-based model [104,105]. We have made use of parameterizations compiled by X. Zheng [71].…”

Section: Chiral Soliton Modelmentioning

confidence: 99%

“…This approach has the advantage that the model preserves the original SU L (N f )× SU R (N f ) symmetry of the QCD Lagrangian (although it does explicitly break the axial U A (1) symmetry). This second approach has recently been extended to three quark flavors and used to make predictions about nucleon structure functions [104,105]. Figure 2.15 shows the ratio g n 1 /F n 1 as predicted by these two approaches to the chiral soliton model.…”

Section: Chiral Soliton Modelmentioning

confidence: 99%

Measurements of the Double-Spin Asymmetry A<sub>1</sub> on Helium-3: Toward a Precise Measurement of the Neutron A<sub>1</sub>

Parno

2011

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The spin structure of protons and neutrons has been an open question for nearly twenty-five years, after surprising experimental results disproved the simple model in which valence quarks were responsible for nearly 100% of the nucleon spin. Diverse theoretical approaches have been brought to bear on the problem, but a shortage of precise data -especially on neutron spin structure -has prevented a thorough understanding.Experiment E06-014, conducted in Hall A of Jefferson Laboratory in 2009, presented an opportunity to add to the world data set for the neutron in the poorly covered valence-quark region. Jefferson Laboratory's highly polarized electron beam, combined with Hall A's facilities for a high-density, highly polarized 3 He target, allowed a high-luminosity double-polarized experiment, while the large acceptance of the BigBite spectrometer gave coverage over a wide kinematic range: 0.15 < x < 0.95. In this work, we present the analysis of a portion of the E06-014 data, measured with an incident beam energy of 4.74 GeV and spanning 1.5 < Q 2 < 5.5 (GeV/c) 2 . From these data, we extract the longitudinal asymmetry in virtual photon-nucleon scattering, A 1 , on the 3 He nucleus. Combined with the remaining E06-014 data, this will form the basis of a measurement of the neutron asymmetry A n 1 that will extend the kinematic range of the data available to test models of spin-dependent parton distributions in the nucleon. AcknowledgmentsNo one in this age can earn a physics PhD based solely on her own work and study; the making of a doctor, like the making of a modern particle-physics experiment, requires the goodwill and support of many. In my own life and studies, I have been profoundly blessed by the presence of my family, friends, and colleagues. It is traditional to thank these wonderful people in these pages, as though words were enough. They aren't, but they are a start.My parents, Christine Marwick and Richard Seymour, brought me up to have both a deep curiosity about the world and the work ethic I needed to answer my own questions. The love of language my mother gave me made writing this dissertation far less painful than it might have been; my father urged me to take my first voluntary science course and then kindly refrained from saying "I told you so" at the sudden fascination with physics that resulted. My not-so-little brother, Matthew, kept me honest with everything I did.The love and support of my extended family has been invaluable. My grandparents, Bob and Dolores Marwick, generously funded my undergraduate education. They and my aunts, uncles, and assorted cousins, scattered around the continent, taught me that I could find something of home wherever I am. To Rob and Ann Marwick, Mike and Monica Marwick, Lorrie Marwick and Guy Marsh, Nancy and Don DeMuth, and Josephine Marwick, thank you for the delicious meals, the fascinating conversations and your willingness to talk physics. To my beloved cousins, thank you for everything. Growing up, I was also lucky to enjoy the love of many peo...

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“…Another way to calculate the s − s asymmetry in the nucleon is using the chiral quark model (CQM) [57,58]. Actually, this model has been many successes so far both for describing the flavor asymmetry and quark-antiquark asymmetry in the nucleon [60,61,62,63,64,65,66,67,68,69,70,71]. In addition to these models, there is also a model called the scalar five-quark model suggested by Pumplin [59] which can give us the intrinsic components of the quark sea.…”

Section: Introductionmentioning

confidence: 99%

Study of the s−s¯ asymmetry in the proton

Goharipour

2018

Nuclear Physics A

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The study of s −s asymmetry is essential to better understand of the structure of nucleon and also the perturbative and nonperturbative mechanisms for sea quark generation. Actually, the nature and dynamical origins of this asymmetry have always been an interesting subject to research both experimentally and theoretically. One of the most powerful models can lead to s−s asymmetry is the meson-baryon model (MBM). In this work, using a simplified configuration of this model suggested by Pumplin, we calculate the s −s asymmetry for different values of cutoff parameter Λ, to study the dependence of model to this parameter and also to estimate the theoretical uncertainty imposed on the results due to its uncertainty. Then, we study the evolution of distributions obtained both at next-to-leading order (NLO) and next-to-next-to-leading order (NNLO) using different evolution schemes. It is shown that the evolution of the intrinsic quark distributions from a low initial scale, as suggested by Chang and Pang, is not a good choice at NNLO using variable flavor number scheme (VFNS).

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Light-flavor sea-quark distributions in the nucleon in the SU(3) chiral quark soliton model. I. Phenomenological predictions

Cited by 55 publications

References 77 publications

The Spin Structure of the Nucleon

The Spin Structure of the Nucleon

Measurements of the Double-Spin Asymmetry A<sub>1</sub> on Helium-3: Toward a Precise Measurement of the Neutron A<sub>1</sub>

Study of the s−s¯ asymmetry in the proton

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