We present our final results of the charmonium spectrum in quenched QCD on anisotropic lattices. Simulations are made with the plaquette gauge action and a tadpole improved clover quark action employing $\xi = a_s/a_t = 3$. We calculate the spectrum of S- and P-states and their excitation, and study the scaling behavior of mass splittings. Comparison is made with the experiment and previous lattice results. The issue of hyperfine splitting for different choices of the clover coefficients obtained by Klassen is discussed.

Quenched approximation

Lattice (music)

10.48550/arxiv.hep-lat/0110129

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Eta meson mass and topology in QCD with two light flavors

Nuclear Physics B - Proceedings Supplements (2000)

A. Ali Khan Sinya Aoki R. Burkhalter Shinji Ejiri M. Fukugita

10.1016/s0920-5632(00)91611-6

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I = 2 pion scattering phase shift with Wilson fermions

Nuclear Physics B - Proceedings Supplements (2003)

Sinya Aoki M. Fukugita S. Hashimoto Ken-Ichi Ishikawa N. Ishizuka

Quenched approximation

10.1016/s0920-5632(03)01527-5

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Determination of the Chiral Condensate from (2+1)-Flavor Lattice QCD

Physical Review Letters (2010)

Hidenori Fukaya Sinya Aoki S. Hashimoto T. Kaneko J. Noaki

We perform a precise calculation of the chiral condensate in QCD using lattice QCD with 2+1 flavors of dynamical overlap quarks. Up and down quark masses cover a range between 3 and 100 MeV on a 16{3}x48 lattice at a lattice spacing approximately 0.11 fm. At the lightest sea quark mass, the finite volume system on the lattice is in the regime. By matching the low-lying eigenvalue spectrum of the Dirac operator with the prediction of chiral perturbation theory at the next-to-leading order, we determine the chiral condensate in (2+1)-flavor QCD with strange quark mass fixed at its physical value as Sigma;{MS[over ]}(2 GeV)=[242(04)(+19/-18) MeV]{3} where the errors are statistical and systematic, respectively.

Lattice (music)

Strange quark

10.1103/physrevlett.104.122002

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Non-trivial phase structure of N = 3 QCD with O(a)-improved Wilson fermion at zero temperature

Nuclear Physics B - Proceedings Supplements (2002)

Sinya Aoki R. Burkhalter M. Fukugita S. Hashimoto K-I. Ishikawa

Zero temperature

Zero (linguistics)

Lattice (music)

10.1016/s0920-5632(01)01683-8

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Hints and challenges in heavy flavor physics

Proceedings of The 36th Annual International Symposium on Lattice Field Theory — PoS(LATTICE2018) (2019)

S. Hashimoto

Heavy flavor physics entered a new era when the Belle II experiment observed its first collision. There are several hints found so far by BaBar, Belle, and LHCb in particular, that suggest the physics beyond the Standard Model appearing in the loop processes at short distances. They will be further tested by higher precision experiments in the coming years, while the role of lattice QCD is to understand the long-distance physics quantitatively so that one can unambiguously isolate the short-distance physics from the experimental data. I summarize the status towards this goal and then look at the challenges we are facing.

Lattice (music)

10.22323/1.334.0008

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The Discovery Potential of a Super B Factory

arXiv (Cornell University) (2005)

J.L. Hewett Dg Hitlin K. Abe Kaustubh Agashe J. Albert

The Proceedings of the 2003 SLAC Workshops on flavor physics with a high luminosity asymmetric e+e- collider. The sensitivity of flavor physics to physics beyond the Standard Model is addressed in detail, in the context of the improvement of experimental measurements and theoretical calculations.

Factory (object-oriented programming)

B-factory

10.48550/arxiv.hep-ph/0503261

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$B \rightarrow π\ell ν$ with Möbius Domain Wall Fermions

arXiv (Cornell University) (2017)

Brian Colquhoun S. Hashimoto T. Kaneko

We report on the status of our calculation of the exclusive semileptonic decay, $B\rightarrow π\ell ν$; a key process in the determination of the CKM matrix element $|V_{ub}|$. The Möbius domain wall action is used for both light and heavy quarks on gauge ensembles that include the effects of $2+1$ flavours of quarks in the sea at three values of the lattice spacing: $a\approx 0.08~\mathrm{fm}$, $a\approx0.055~\mathrm{fm}$, and $a\approx0.044~\mathrm{fm}$. Pion masses go down to $300~\mathrm{MeV}$ while heavy quarks masses are as large as $2.44m_c$. We present preliminary results of form factors from this process, showing dependence on momentum transfer, lattice spacing, and the heavy quark mass.

10.48550/arxiv.1710.07094

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Simulation with 2+1 flavors of dynamical overlap fermions

Proceedings of The XXVI International Symposium on Lattice Field Theory — PoS(LATTICE 2008) (2009)

Hideo Matsufuru Sinya Aoki Ting-Wai Chiu S. Hashimoto Tung‐Han Hsieh

We report the status of lattice QCD simulations with 2+1 flavors of dynamical overlap fermions by the JLQCD-TWQCD Collaboration.Numerical simulations are performed on a 16 3 × 48 lattice at u and d quark masses ranging (1/6 -1) physical strange quark mass, and at two values of strange quark mass around the physical value.We discuss the numerical algorithms and run statistics.

10.22323/1.066.0077

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Approaches to inclusive semileptonic B(s)-meson decays from Lattice QCD

Journal of High Energy Physics (2023)

Alessandro Barone S. Hashimoto Andreas Jüttner T. Kaneko Ryan Kellermann

We address the nonperturbative calculation of the inclusive decay rate of semileptonic $B_{(s)}$-meson decays from lattice QCD. Precise Standard-Model predictions are key ingredients in searches for new physics, and this type of computation may eventually provide new insight into the long-standing tension between the inclusive and exclusive determinations of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements $|V_{cb}|$ and $|V_{ub}|$. We present results from a pilot lattice computation for $B_s \rightarrow X_c\, l \nu_l$, where the initial $b$ quark described by the relativistic-heavy-quark (RHQ) formalism on the lattice and the other valence quarks discretised with domain-wall fermions are simulated approximately at their physical quark masses. We compare two different methods for computing the decay rate from lattice data of Euclidean $n$-point functions, namely Chebyshev and Backus-Gilbert approaches. We further study how much the ground-state meson dominates the inclusive decay rate and indicate our strategy towards a computation with a more comprehensive systematic error budget.

D meson

Lattice (music)

B meson

Cabibbo–Kobayashi–Maskawa matrix

Semileptonic decay

10.1007/jhep07(2023)145

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Citations (16)