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meson decay constants and distribution amplitudes in a self-consistent light-front quark modelArifi, A. J.; Choi, H.-M.*; Ji, C.-R.*
Physical Review D, 112(3), p.033009_1 - 033009_15, 2025/08
被引用回数：0 パーセンタイル：0.00In this study, we present a comprehensive analysis of decay constants and chiral-even and chiral-odd distribution amplitudes (DAs) up to twist 4 for the meson in the standard light-front quark model (LFQM) based on the Bakamjian-Thomas (BT) construction. For the meson, which possesses both longitudinal and transverse polarizations, two types of decay constants arises accordingly. We demonstrate that these decay constants can be self-consistently extracted from both local and nonlocal matrix elements in a manner independent of current components, polarizations, and reference frames. In particular, we emphasize the role of nonlocal matrix elements involving axial-vector and scalar currents, where mixing between two different decay constants; occurs. We show that this mixing is consistently resolved through the BT construction, ensuring the proper extraction of these decay constants. Additionally, we investigate the structure of chiral-even DAs and chiral-odd DAs beyond leading twists, and present their corresponding 
-moments and Gegenbauer moments. These results provide deeper insight into the nonperturbative structure of vector mesons and demonstrate the robustness and self-consistency of the LFQM based on the BT framework.
Arifi, A. J.*; 末永 大輝*; 保坂 淳; Oh, Y. S.*
Physical Review D, 105(9), p.094006_1 - 094006_17, 2022/05
被引用回数：21 パーセンタイル：83.57(Astronomy & Astrophysics)Decay properties of multistrangeness 
and 
baryon resonances are investigated within the constituent quark model by including relativistic corrections. The strong decay widths of various and resonances are computed and tested for internal quark configurations to pin down their spin-parity (
) quantum numbers and internal structures. We found that the Roper-like resonances in the multistrangeness sector have large decay widths bearing resemblances to their siblings in light and heavy baryon sectors. In addition, we obtained the decay ratio for the (2012) as 
( 
)/( ) = 4.5%, which is consistent with the experimental data when = 3/2
is assigned. This observation holds the possibility that the (2012) could naturally be explained as a three-quark state in the quark model. The decays of other low-lying and resonances are systematically analyzed, which would be useful to unveil the structure of these resonances in future experiments.
Arifi, A. J.*; 永廣 秀子*; 保坂 淳; 谷田 聖
Few-Body Systems, 62(2), p.36_1 - 36_5, 2021/06
被引用回数：3 パーセンタイル：28.11(Physics, Multidisciplinary)The Roper resonance 
has been a mysterious state in hadron physics for almost 60 years because of its incompatibility with the conventional quark model. In recent years, the candidates of Roper-like state in heavy baryon sectors, e.g., 
and 
, have been observed in experiments although their spin and parity are not directly measured. Interestingly, they share not only similar excitation energies but also decay properties, that may provide a new aspect of the Roper resonance. In this work, we focus on investigating the decay properties of Roper-like heavy baryons. In particular, we show how their two-pion emission decay can be helpful to determine their spin and parity. The experimental confirmation is required to further establish the existence of the Roper-like states. Such measurements can be principally done in the current experimental facilities such as LHC and B-factory experiments.
Arifi, A. J.*; 末永 大輝*; 保坂 淳
Physical Review D, 103(9), p.094003_1 - 094003_6, 2021/05
被引用回数：24 パーセンタイル：77.90(Astronomy & Astrophysics)We investigate relativistic corrections of an order 1/m
, where m is the constituent quark mass, to heavy baryon decays by emitting one pseudoscalar meson in the quark model. This work is motivated by shortcomings in the previous studies in the nonrelativistic quark model for decays of the Roper-like states, such as 
(2765). We find that the relativistic corrections due to the internal motion of quarks are essential ingredients in improving their decay properties, such that the decay widths are significantly increased. In addition, such corrections can explain a phenomenological suppression of the quark axial-vector coupling constant 
for the 
(2455) and (2520) decays.
Arifi, A. J.*; 永廣 秀子*; 保坂 淳; 谷田 聖
Physical Review D, 101(11), p.111502_1 - 111502_5, 2020/06
被引用回数：15 パーセンタイル：60.73(Astronomy & Astrophysics)We study the three-body decay of the newly observed bottom baryon 
by LHCb; 
. Its mass about 500 MeV above the ground state 
and a broad width imply that the state could be an analogue of the Roper resonance of the nucleon . In terms of sequential processes going through 
and 
, we find that the observed invariant mass distribution is reproduced assuming its spin and parity 
. We discuss that the ratio of the two sequential processes and angular correlation of two pions are useful for the determination of spin and parity. We suggest further studies for the Roper resonance analogue in various flavor contents, raising an interesting and important question in baryon spectroscopy.
and determination of its spin-parityArifi, A. J.*; 永廣 秀子*; 保坂 淳; 谷田 聖
Physical Review D, 101(9), p.094023_1 - 094023_17, 2020/05
被引用回数：13 パーセンタイル：55.88(Astronomy & Astrophysics)We study three-body decays of 
by using effective Lagrangians in a non-relativistic framework. We consider the sequential decays through 
and 
in intermediate states which are dominant contributions. The coupling constants in the effective Lagrangians are computed in the quark model. We demonstrate that the ratio 
and angular correlations are sensitive to the spin and parity of 
. Thus, the measurement of these observables in experimental facilities such as Belle and LHCb can provide useful constraints to determine the spin and parity of .
Arifi, A. J.
no journal, ,
光フロントダイナミクスは、ブースト不変性と単純な真空構造により、ハドロンをパートン自由度で記述するための自然な枠組みを提供する。この枠組みに基づいて、光フロントアプローチは、崩壊定数や形状因子といったハドロンの特性を研究するのに有効であることが証明されている。しかしながら、共変性と電流保存則に関する課題は依然として残っており、これは慎重に扱わなければならない微妙な寄与が一因となっている。最近の進歩により、これらの問題は明らかになり、光フロントクォーク模型は高次ツイスト分布振幅を含むように拡張された。これらの進歩は、非摂動的なハドロン構造とハードプロセスにおけるQCD因数分解との橋渡しとして、光フロントダイナミクスを強化している。
Arifi, A. J.
no journal, ,
In this talk, I present past works conducted in collaboration with Prof. Atsushi Hosaka on the structure of heavy baryons within the framework of the quark model. Our study explores the role of heavy quarks and internal quark dynamics in determining the spectroscopy and properties of these baryons. In addition, I will briefly discuss ongoing investigations into meson structures using light-front dynamics, emphasizing how this relativistically consistent approach enables detailed analysis of meson wavefunctions and form factors. These studies contribute to a deeper understanding of hadron phenomenology and its connection to the underlying theory of quantum chromodynamics.
Arifi, A. J.
no journal, ,
光波面クォーク模型(LFQM)は、中間子の内部構造をそのパートン自由度の観点から研究するための強力な枠組みを提供する。その明白なブースト不変性と単純な真空構造は、非摂動的なハドロン特性と実験的に測定可能な観測量を結び付けるのに特に適している。本講演では、LFQMを用いた中間子構造に関する最近の研究成果を、(1)ハドロンダイナミクスを正確に捉える現実的な光波面波動関数の構築に向けた進展、(2)光波面アプローチに固有の共変性と電流保存則の課題への対処、(3)原子核物質などの極限環境における中間子特性の変化の理解という3つの中心的問題に焦点を当てて紹介する。これらの進展は、LFQMが中間子とQCDの非摂動領域におけるその役割についての理解を深めるための効果的かつ多用途なツールであることを浮き彫りにする。
