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Charmonium spectrum from quenched anisotropic lattice QCD.

https://hiroshima.repo.nii.ac.jp/records/2008364
https://hiroshima.repo.nii.ac.jp/records/2008364
bca4b49d-8056-40ea-99e6-2d07131effc5
名前 / ファイル ライセンス アクション
e094508.pdf e094508.pdf (471.5 KB)
Item type デフォルトアイテムタイプ_(フル)(1)
公開日 2006-04-10
タイトル
タイトル Charmonium spectrum from quenched anisotropic lattice QCD.
言語 en
作成者 CP-PACS, Collaboration

× CP-PACS, Collaboration

en CP-PACS, Collaboration

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Okamoto, M

× Okamoto, M

en Okamoto, M

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Aoki, S

× Aoki, S

en Aoki, S

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Burkhalter, R

× Burkhalter, R

en Burkhalter, R

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Ejiri, S

× Ejiri, S

en Ejiri, S

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Fukugita, M

× Fukugita, M

en Fukugita, M

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Hashimoto, S

× Hashimoto, S

en Hashimoto, S

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Ishikawa, Kenichi

× Ishikawa, Kenichi

en Ishikawa, Kenichi

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Ishizuka, N

× Ishizuka, N

en Ishizuka, N

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Iwasaki, Y

× Iwasaki, Y

en Iwasaki, Y

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Kanaya, K

× Kanaya, K

en Kanaya, K

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Kaneko, T

× Kaneko, T

en Kaneko, T

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Kuramashi, Y

× Kuramashi, Y

en Kuramashi, Y

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Lesk, V

× Lesk, V

en Lesk, V

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Nagai, K

× Nagai, K

en Nagai, K

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Okawa, Masanori

× Okawa, Masanori

en Okawa, Masanori

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Taniguchi, Y

× Taniguchi, Y

en Taniguchi, Y

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Ukawa, A

× Ukawa, A

en Ukawa, A

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Yoshié, T

× Yoshié, T

en Yoshié, T

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利情報
権利情報 Copyright (c) 2002 The American Physical Society
主題
主題Scheme NDC
主題 420
内容記述
内容記述 We present a detailed study of the charmonium spectrum using anisotropic lattice QCD. We first derive a tree-level improved clover quark action on the anisotropic lattice for arbitrary quark mass by matching the Hamiltonian on the lattice and in the continuum. The heavy quark mass dependence of the improvement coefficients, i.e., the ratio of the hopping parameters ζ=Kt/Ks and the clover coefficients cs,t, is examined at the tree level, and effects of the choice of the spatial Wilson parameter rs are discussed. We then compute the charmonium spectrum in the quenched approximation employing ξ=as/at=3 anisotropic lattices. Simulations are made with the standard anisotropic gauge action and the anisotropic clover quark action with rs=1 at four lattice spacings in the range as=0.07–0.2 fm. The clover coefficients cs,t are estimated from tree-level tadpole improvement. On the other hand, for the ratio of the hopping parameters ζ, we adopt both the tree-level tadpole-improved value and a non-perturbative one. The latter employs the condition that the speed of light calculated from the meson energy-momentum relation be unity. We calculate the spectrum of S and P states and their excitations using both the pole and kinetic masses. We find that the combination of the pole mass and the tadpole-improved value of ζ to yield the smoothest approach to the continuum limit, which we then adopt for the continuum extrapolation of the spectrum. The results largely depend on the scale input even in the continuum limit, showing a quenching effect. When the lattice spacing is determined from the 1P-1S splitting, the deviation from the experimental value is estimated to be ∼30-1.968704or the S-state hyperfine splitting and ∼20-1.962292or the P-state fine structure. Our results are consistent with previous results at ξ=2 obtained by Chen when the lattice spacing is determined from the Sommer scale r0. We also address the problem with the hyperfine splitting that different choices of the clover coefficients lead to disagreeing results in the continuum limit. Making a leading order analysis based on potential models we show that a large hyperfine splitting ∼95 MeV obtained by Klassen with a different choice of the clover coefficients is likely an overestimate.
言語 en
出版者
出版者 The American Physical Society
日付
日付 2006-04-10
日付タイプ Created
言語
言語 eng
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
資源タイプ journal article
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
関連情報
識別子タイプ DOI
関連識別子 10.1103/PhysRevD.65.094508
関連情報
識別子タイプ DOI
関連識別子 http://dx.doi.org/10.1103/PhysRevD.65.094508
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 0556-2821
開始ページ
開始ページ 094508
書誌情報 Physical Review D
Physical Review D

巻 65, 号 9, p. 094508, 発行日 2002
旧ID 14483
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