B→πℓ+ℓ− form factors reexamined in the whole kinematically accessible region
We reexamine the B→πℓ+ℓ−(ℓ=e,μ,τ) form factors, f+B→π(q2), f0B→π(q2) and fTB→π(q2), in the entire region of the momentum transfer squared q2, by taking advantage of the complementarity between lattice QCD (LQCD) simulation and light cone sum rule approach (LCSR), and analyticity of the form factors....
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2015-11-01
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| Series: | Nuclear Physics B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0550321315003168 |
| _version_ | 1828418899333349376 |
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| author | Zuo-Hong Li Zong-Guo Si Ying Wang Nan Zhu |
| author_facet | Zuo-Hong Li Zong-Guo Si Ying Wang Nan Zhu |
| author_sort | Zuo-Hong Li |
| collection | DOAJ |
| description | We reexamine the B→πℓ+ℓ−(ℓ=e,μ,τ) form factors, f+B→π(q2), f0B→π(q2) and fTB→π(q2), in the entire region of the momentum transfer squared q2, by taking advantage of the complementarity between lattice QCD (LQCD) simulation and light cone sum rule approach (LCSR), and analyticity of the form factors. A LCSR calculation with a chiral current correlator, which could avoid pollution by twist-3 components, is performed at twist-2 next-to-leading order (NLO) accuracy, to determinate the form factor shapes in the small and intermediate q2 region. Further, fitting simultaneously the LCSR results for these form factors and the related LQCD ones (available or based on a SUF(3) symmetry breaking ansatz) to a Bourrely–Caprini–Lellouch (BCL) parametrization, we get a global understanding of their q2 behaviors. Our findings turn out to be consistent with the recent study by Ali, Parkhomenko and Rusov, and the resulting observation for the vector form factor provides support for the existing LQCD as well as LCSR predictions extrapolated to the entire kinematically accessible region. |
| first_indexed | 2024-12-10T14:44:07Z |
| format | Article |
| id | doaj.art-ed5e34878adc40fcb48c6f3ea4e86a8b |
| institution | Directory Open Access Journal |
| issn | 0550-3213 1873-1562 |
| language | English |
| last_indexed | 2024-12-10T14:44:07Z |
| publishDate | 2015-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Physics B |
| spelling | doaj.art-ed5e34878adc40fcb48c6f3ea4e86a8b2022-12-22T01:44:36ZengElsevierNuclear Physics B0550-32131873-15622015-11-01900C19822110.1016/j.nuclphysb.2015.09.008B→πℓ+ℓ− form factors reexamined in the whole kinematically accessible regionZuo-Hong Li0Zong-Guo Si1Ying Wang2Nan Zhu3Department of Physics, Yantai University, Yantai, 264005, PR ChinaSchool of Physics, Shandong University, Jinan, 250100, PR ChinaSchool of Physics, Shandong University, Jinan, 250100, PR ChinaDepartment of Physics, Yantai University, Yantai, 264005, PR ChinaWe reexamine the B→πℓ+ℓ−(ℓ=e,μ,τ) form factors, f+B→π(q2), f0B→π(q2) and fTB→π(q2), in the entire region of the momentum transfer squared q2, by taking advantage of the complementarity between lattice QCD (LQCD) simulation and light cone sum rule approach (LCSR), and analyticity of the form factors. A LCSR calculation with a chiral current correlator, which could avoid pollution by twist-3 components, is performed at twist-2 next-to-leading order (NLO) accuracy, to determinate the form factor shapes in the small and intermediate q2 region. Further, fitting simultaneously the LCSR results for these form factors and the related LQCD ones (available or based on a SUF(3) symmetry breaking ansatz) to a Bourrely–Caprini–Lellouch (BCL) parametrization, we get a global understanding of their q2 behaviors. Our findings turn out to be consistent with the recent study by Ali, Parkhomenko and Rusov, and the resulting observation for the vector form factor provides support for the existing LQCD as well as LCSR predictions extrapolated to the entire kinematically accessible region.http://www.sciencedirect.com/science/article/pii/S0550321315003168 |
| spellingShingle | Zuo-Hong Li Zong-Guo Si Ying Wang Nan Zhu B→πℓ+ℓ− form factors reexamined in the whole kinematically accessible region Nuclear Physics B |
| title | B→πℓ+ℓ− form factors reexamined in the whole kinematically accessible region |
| title_full | B→πℓ+ℓ− form factors reexamined in the whole kinematically accessible region |
| title_fullStr | B→πℓ+ℓ− form factors reexamined in the whole kinematically accessible region |
| title_full_unstemmed | B→πℓ+ℓ− form factors reexamined in the whole kinematically accessible region |
| title_short | B→πℓ+ℓ− form factors reexamined in the whole kinematically accessible region |
| title_sort | b πl l form factors reexamined in the whole kinematically accessible region |
| url | http://www.sciencedirect.com/science/article/pii/S0550321315003168 |
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