Lattice continuum-limit study of nucleon parton quasidistribution functions
The parton quasidistribution functions approach provides a path to computing parton distribution functions (PDFs) using lattice QCD. This approach requires matrix elements of a power-divergent operator in a nucleon at high momentum and one generically expects discretization effects starting at first...
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| Veröffentlicht in: | Physical review. D 2021-05, Vol.103 (9), p.1, Article 094512 |
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| container_title | Physical review. D |
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| creator | Alexandrou, Constantia Cichy, Krzysztof Constantinou, Martha Green, Jeremy R. Hadjiyiannakou, Kyriakos Jansen, Karl Manigrasso, Floriano Scapellato, Aurora Steffens, Fernanda |
| description | The parton quasidistribution functions approach provides a path to computing parton distribution functions (PDFs) using lattice QCD. This approach requires matrix elements of a power-divergent operator in a nucleon at high momentum and one generically expects discretization effects starting at first order in the lattice spacing a . Therefore, it is important to demonstrate that the continuum limit can be reliably taken and to understand the size and shape of lattice artifacts. In this work, we report a calculation of isovector unpolarized and helicity PDFs using lattice ensembles with Nf = 2 + 1 + 1 Wilson twisted mass fermions, a pion mass of approximately 370 MeV, and three different lattice spacings. Our results show a significant dependence on a , and the continuum extrapolation produces a better agreement with phenomenology. The latter is particularly true for the antiquark distribution at small momentum fraction x , where the extrapolation changes its sign. |
| doi_str_mv | 10.1103/PhysRevD.103.094512 |
| format | Article |
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This approach requires matrix elements of a power-divergent operator in a nucleon at high momentum and one generically expects discretization effects starting at first order in the lattice spacing a . Therefore, it is important to demonstrate that the continuum limit can be reliably taken and to understand the size and shape of lattice artifacts. In this work, we report a calculation of isovector unpolarized and helicity PDFs using lattice ensembles with Nf = 2 + 1 + 1 Wilson twisted mass fermions, a pion mass of approximately 370 MeV, and three different lattice spacings. Our results show a significant dependence on a , and the continuum extrapolation produces a better agreement with phenomenology. 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D</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Alexandrou, Constantia</au><au>Cichy, Krzysztof</au><au>Constantinou, Martha</au><au>Green, Jeremy R.</au><au>Hadjiyiannakou, Kyriakos</au><au>Jansen, Karl</au><au>Manigrasso, Floriano</au><au>Scapellato, Aurora</au><au>Steffens, Fernanda</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Lattice continuum-limit study of nucleon parton quasidistribution functions</atitle><jtitle>Physical review. D</jtitle><date>2021-05-18</date><risdate>2021</risdate><volume>103</volume><issue>9</issue><spage>1</spage><pages>1-</pages><artnum>094512</artnum><issn>2470-0010</issn><eissn>2470-0029</eissn><abstract>The parton quasidistribution functions approach provides a path to computing parton distribution functions (PDFs) using lattice QCD. 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| source | American Physical Society Journals |
| subjects | Distribution functions Extrapolation Fermions Helicity Mathematical analysis Momentum Nucleons Operators (mathematics) Partons Phenomenology Pions Quantum chromodynamics |
| title | Lattice continuum-limit study of nucleon parton quasidistribution functions |
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