☆ 4.7 Article

Radiative transitions of heavy quarkonium states

PHYSICAL REVIEW D (2009)

Journal

PHYSICAL REVIEW D

Volume 79, Issue 5, Pages -

Publisher

AMER PHYSICAL SOC

DOI: 10.1103/PhysRevD.79.054015

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Categories

Astronomy & Astrophysics Physics, Particles & Fields

Funding

EU [MRTN-CT-2006-035482]
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Abstract

We study radiative decays of heavy Q (Q) over bar states, both for Q = c and Q = b, using an effective Lagrangian approach which exploits spin symmetry for such states. We use existing data on radiative quarkonium transitions to predict some unmeasured decay rates. We also discuss how these modes can be useful to understand the structure of X(3872).

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Xu-Chang Zheng, Chao-Hsi Chang, Xing-Gang Wu, Xu-Dong Huang, Guang-Yu Wang

Summary: The paper investigates the inclusive production of heavy quarkonium eta(Q) (Q = b or c) via Z boson decays in the framework of nonrelativistic QCD effective theory. It analyzes the contributions from color-singlet and color-octet Fock states, and presents total and differential decay widths for Z -> eta(Q) + X decays. Numerical results suggest that a large number of eta(c) and eta(b) meson events can be produced at a high luminosity e(+)e(-) collider, potentially aiding in clarifying issues related to heavy quarkonium eta(Q) and nonrelativistic QCD.

PHYSICAL REVIEW D (2021)

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Article Computer Science, Interdisciplinary Applications

BEEC2.0: An upgraded version for the production of heavy quarkonium at electron-positron collider

Zhi Yang, Xu-Chang Zheng, Xing -Gang Wu

Summary: The upgraded version of the BEEC event generator allows for the simulation of quarkonium production with polarized electron and positron beams, including the production of color-singlet 2S-wave states. It provides a useful tool for studying the feasibility of quarkonium production from an experimental perspective.

COMPUTER PHYSICS COMMUNICATIONS (2022)

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Review Mathematics

Anisotropic Flows of Charmonium in the Relativistic Heavy-Ion Collisions

Chenyu Li, Baoyi Chen

Summary: This article reviews recent studies on the anisotropic flows (v(1), v(2), v(3)) of charmonium in the quark-gluon plasma formed in relativistic heavy-ion collisions. It is found that the collective flows of the bulk medium are developed due to the anisotropic pressure gradient of the medium. Charm quarks, strongly coupled with the medium, carry the collective flows from the expanding medium, which are then inherited by the regenerated charmonium through the coalescence process. The initial energy density of the medium exhibits triangularity in event-by-event collisions where nucleon positions fluctuate. As a result, triangular flows of the bulk medium and heavy flavor particles can be developed. Furthermore, the rotation of the medium in non-central heavy-ion collisions induces a rapidity-odd distribution of the initial energy density in the longitudinal direction. This leads to biased dissociation of charmonium in the forward (backward) rapidity along positive and negative x-directions, resulting in non-zero directed flow of charmonium. The directed, elliptic, and triangular flows (v(1), v(2), v(3)) of charmonium arise from the anisotropic initial distributions of the medium energy density in both the transverse and longitudinal directions.

MATHEMATICS (2022)

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Article Multidisciplinary Sciences

Observation of Rydberg moire excitons

Qianying Hu, Zhen Zhan, Huiying Cui, Yalei Zhang, Feng Jin, Xuan Zhao, Mingjie Zhang, Zhichuan Wang, Qingming Zhang, Kenji Watanabe, Takashi Taniguchi, Xuewei Cao, Wu-Ming Liu, Fengcheng Wu, Shengjun Yuan, Yang Xu

Summary: Researchers demonstrate the spatial confinement and manipulation of Rydberg moire excitons through two-dimensional moire superlattices, indicating their potential for quantum technologies.

SCIENCE (2023)

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Article Astronomy & Astrophysics

Magnetic field induced hair structure in the charmonium gluon dissociation

Jin Hu, Shuzhe Shi, Zhe Xu, Jiaxing Zhao, Pengfei Zhuang

Summary: This study investigates the impact of the electromagnetic field on the dissociation of charmonium gluons in quark-gluon plasma. The findings suggest that the magnetic field strength significantly affects the gluon dissociation, particularly for certain wave states.

PHYSICAL REVIEW D (2022)

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Article Astronomy & Astrophysics

fρ/mρ and fπ/mρ ratios and the conformal window

Hee Sok Chung, Daniel Nogradi

Summary: The f(rho)/m(rho) ratio is calculated within perturbative NRQCD at NLO-L3 order, providing reliable predictions close to the upper end of the conformal window. The comparison of NNLO and NLO-L3 results indicates the validity of the Banks-Zaks expansion down to twelve flavors. Previous lattice calculations combined with KSRF relations give us the ratio for 2 <= N-f <= 10, and assuming a monotonic dependence on N-f, an estimate for the lower end of the conformal window, N-f* ~ 12, is obtained. The f(pi)/m(rho) ratio is also considered, but the current NNLO level perturbative calculation is insufficient for reliable matching, leading to an estimate of N-f* ~ 13.

PHYSICAL REVIEW D (2023)

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Article Multidisciplinary Sciences

Unraveling gluon jet quenching through J=ik production in heavy-ion collisions

Shan-Liang Zhang, Jinfeng Liao, Guang-You Qin, Enke Wang, Hongxi Xing

Summary: The study shows that J=ik in the high transverse momentum region can serve as a sensitive indicator of gluon energy loss in the medium, further confirming the significant role of gluons in the suppression of high pT J=ik.

SCIENCE BULLETIN (2023)

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Article Physics, Particles & Fields

Exclusive b → sv(v)over-bar induced transitions in the RSc model

P. Biancofiore, P. Colangelo, F. De Fazio, E. Scrimieri

EUROPEAN PHYSICAL JOURNAL C (2015)

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Article Physics, Particles & Fields

On thermalization of a boost-invariant non-Abelian plasma

L. Bellantuono, P. Colangelo, F. De Fazio, F. Giannuzzi

JOURNAL OF HIGH ENERGY PHYSICS (2015)

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Article Astronomy & Astrophysics

On exclusive h → Vl+l- decays

Pietro Colangelo, Fulvia De Fazio, Pietro Santorelli

PHYSICS LETTERS B (2016)

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Article Physics, Particles & Fields

331 Models Facing the Tensions in ΔF=2 Processes with the Impact on ε′/ε, Bs → μ+μ- and B → K*μ+μ-

Andrzej J. Buras, Fulvia De Fazio

JOURNAL OF HIGH ENERGY PHYSICS (2016)

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Article Physics, Particles & Fields

Scrutinizing (B)over-bar → D(Dπ)l-(ν)over-barl and (B)over-bar → D (Dγ)l-(ν)over-barl in search of new physics footprints

P. Colangelo, F. De Fazio

JOURNAL OF HIGH ENERGY PHYSICS (2018)

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Article Astronomy & Astrophysics

Rare semileptonic B → K*l+l- decays in the RSc model

P. Biancofiore, P. Colangelo, F. De Fazio

PHYSICAL REVIEW D (2014)

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Article Physics, Nuclear

Quarkonium dissociation in strongly coupled far-from-equilibrium matter: holographic description

L. Bellantuono, P. Colangelo, F. De Fazio, F. Giannuzzi, S. Nicotri

NUCLEAR PHYSICS A (2019)

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Article Physics, Particles & Fields

Quark-lepton connections in Z′ mediated FCNC processes: gauge anomaly cancellations at work

Jason Aebischer, Andrzej J. Buras, Maria Cerda-Sevilla, Fulvia De Fazio

JOURNAL OF HIGH ENERGY PHYSICS (2020)

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Article Physics, Particles & Fields

The charm of 331

Andrzej J. Buras, Pietro Colangelo, Fulvia De Fazio, Francesco Loparco

Summary: In the context of 331 models, a detailed analysis of flavour changing neutral current processes in the charm sector reveals that new Physics effects in certain observables can be much larger than those predicted by the Standard Model. Particularly, the branching ratio of the D-0 -> mu(+)mu(-) mode can be enhanced by 6 orders of magnitude relative to the SM.

JOURNAL OF HIGH ENERGY PHYSICS (2021)

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Article Physics, Particles & Fields

Relations among Bc → J/ψ, ηc form factors

P. Colangelo, F. De Fazio, F. Loparco, N. Losacco, M. Novoa-Brunet

Summary: In this study, we analyze the form factors of the B-c -> J/psi, eta(c) matrix elements. We use a nonrelativistic QCD expansion and lattice QCD results as input to obtain information on these form factors.

JOURNAL OF HIGH ENERGY PHYSICS (2022)

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Article Physics, Particles & Fields

331 model predictions for rare B and K decays, and increment ΔF=2 processes: an update

Andrzej J. Buras, Fulvia De Fazio

Summary: Motivated by recent advancements in experimental results and lattice calculations, we update our analysis on various flavor observables in four 331 models. Based on their consistency with electroweak precision tests and new experimental data on Bs -> mu(+)mu(-), we explore the dependence of observables on the |V-cb| parameter. We also investigate the impact of new physics contributions on Wilson coefficients and branching ratios of B and K decays.

JOURNAL OF HIGH ENERGY PHYSICS (2023)

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Article Physics, Particles & Fields

Inclusive semileptonic Λb decays in the Standard Model and beyond

P. Colangelo, F. De Fazio, F. Loparco

JOURNAL OF HIGH ENERGY PHYSICS (2020)

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Article Astronomy & Astrophysics

Excited heavy meson decays to light vector mesons: Implications for spectroscopy

S. Campanella, P. Colangelo, F. De Fazio

PHYSICAL REVIEW D (2018)

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Article Astronomy & Astrophysics

Tension in the inclusive versus exclusive determinations of |Vcb|: A possible role of new physics

P. Colangelo, F. De Fazio

PHYSICAL REVIEW D (2017)

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Article Astronomy & Astrophysics

Probes of Lepton Flavor Universality in b -> u Transitions

Pietro Colangelo, Fulvia De Fazio, Francesco Loparco

PARTICLES (2020)

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