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Nakamura, Satoshi; Tsushima, K.

doi:10.1103/physrevd.100.051502

Cited by 20 publications

(12 citation statements)

References 40 publications

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“…For instance, the triangle singularity mechanism have been constructed for producing resonance-like signals for the prominent multiquark candidates P c (4450) [216,217], Z c (3900) ± [218][219][220] (see also Refs. [221][222][223][224]), Z c (4200, 4430) ± [225] and X(4050, 4250) ± [226]. This means that it is essential to distinguish the signals from resonances from those from kinematical singularities.…”

Section: Exotic Hadrons At Eiccmentioning

confidence: 99%

Electron-ion collider in China

et al. 2021

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Lepton scattering is an established ideal tool for studying inner structure of small particles such as nucleons as well as nuclei. As a future high energy nuclear physics project, an Electron-ion collider in China (EicC) has been proposed. It will be constructed based on an upgraded heavy-ion accelerator, High Intensity heavy-ion Accelerator Facility (HIAF) which is currently under construction, together with a new electron ring. The proposed collider will provide highly polarized electrons (with a polarization of ∼80%) and protons (with a polarization of ∼70%) with variable center of mass energies from 15 to 20 GeV and the luminosity of (2–3) × 1033 cm−2 · s−1. Polarized deuterons and Helium-3, as well as unpolarized ion beams from Carbon to Uranium, will be also available at the EicC.The main foci of the EicC will be precision measurements of the structure of the nucleon in the sea quark region, including 3D tomography of nucleon; the partonic structure of nuclei and the parton interaction with the nuclear environment; the exotic states, especially those with heavy flavor quark contents. In addition, issues fundamental to understanding the origin of mass could be addressed by measurements of heavy quarkonia near-threshold production at the EicC. In order to achieve the above-mentioned physics goals, a hermetical detector system will be constructed with cutting-edge technologies.This document is the result of collective contributions and valuable inputs from experts across the globe. The EicC physics program complements the ongoing scientific programs at the Jefferson Laboratory and the future EIC project in the United States. The success of this project will also advance both nuclear and particle physics as well as accelerator and detector technology in China.

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Section: Exotic Hadrons At Eiccmentioning

confidence: 99%

Electron-ion collider in China

et al. 2021

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“…[34]. Attempts have been made to interpret some XYZ exotic candidates as bumps due to TSs [35][36][37][38][39][40][41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Triangle singularity appearing as an X(3872) -like peak in B→(J/ψπ
Nakamura
¹

2020
Phys. Rev. D
Self Cite
17
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8
0
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We consider a triangle diagram for B 0 → ðJ=ψπ þ π − ÞK þ π − where an Xð3872Þ peak has been observed experimentally. We demonstrate that a triangle singularity inherent in the triangle diagram creates a sharp peak in the J=ψπ þ π − invariant mass distribution when the final ðJ=ψπ þ π − Þπ invariant mass is at and around the D ÃDÃ threshold. The position and width of the peak are 3871.68 MeV (a few keV above the D Ã0D0 threshold) and ∼0.4 MeV, respectively, in perfect agreement with the precisely measured Xð3872Þ mass and width: 3871.69 AE 0.17 MeV and <1.2 MeV. This remarkable agreement is virtually parameterfree. The result indicates that the considered mechanism has to be understood in advance when separating an Xð3872Þ-pole contribution from B 0 → ðJ=ψπ þ π − ÞK þ π − data; the separation yields an Xð3872Þπ line shape that could be used to determine the Xð3872Þ mass. We suggest a method to set a constraint on the triangle mechanism by analyzing a charge analogous process B 0 → ðJ=ψπ 0 π − ÞK þ π 0 where a similar triangle singularity generates an X − ð3876Þ-like peak.

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“…( 4) of Ref. [45] for the parametrization. We use the cutoff Λ = 1 GeV in the form factors throughout unless otherwise stated.…”

Section: ]mentioning

confidence: 99%

Triangle singularity appearing as an $X(3872)$-like peak in $B\to (J/ψπ^+π^-) Kπ$

Nakamura

2019

Preprint

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X(3872) has been an outstanding candidate of exotic hadrons beyond the conventional quarkantiquark picture, and invited extensive studies. Yet, we still have not seen a clearcut explanation, which does not resort to fine-tuning uncertain hadron dynamics, of the well-established properties of X(3872) such as its mass and width. In this work, we consider a triangle diagram for B → (J/ψπ + π − )Kπ where a X(3872) peak has been observed experimentally. We demonstrate that a triangle singularity inherent in the triangle diagram creates a sharp peak in the J/ψπ + π − invariant mass distribution. The position and width of the peak is 3871.71 MeV (∼30 keV above the D * 0 D0 threshold) and ∼0.5 MeV, respectively, in perfect agreement with the precisely measured X(3872) mass and width: 3871.69 ± 0.17 MeV and < 1.2 MeV. This result is virtually parameter-free because the triangle singularity is a kinematical effect and does not depend on details of hadron dynamics. Although this work is limited to one of several processes where X(3872) has been observed, X(3872) as manifestations of triangle singularities is now a promising option.

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Zc(4430) and Zc
Satoshi Nakamura
¹
,
K. Tsushima
²

Cited by 20 publications

References 40 publications

Electron-ion collider in China

Electron-ion collider in China

Triangle singularity appearing as an X(3872) -like peak in B→(J/ψπ
Nakamura
¹

2020
Phys. Rev. D
Self Cite
17
1
8
0
View full text Add to dashboard Cite

Triangle singularity appearing as an $X(3872)$-like peak in $B\to (J/ψπ^+π^-) Kπ$

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Zc(4430) and ZcSatoshi Nakamura1, K. Tsushima2

Cited by 20 publications

References 40 publications

Electron-ion collider in China

Electron-ion collider in China

Triangle singularity appearing as an X(3872) -like peak in B→(J/ψπNakamura1 2020Phys. Rev. DSelf Cite17180View full textAdd to dashboardCite

Triangle singularity appearing as an $X(3872)$-like peak in $B\to (J/ψπ^+π^-) Kπ$

Contact Info

Product

Resources

About

Zc(4430) and Zc
Satoshi Nakamura
¹
,
K. Tsushima
²

Triangle singularity appearing as an X(3872) -like peak in B→(J/ψπ
Nakamura
¹

2020
Phys. Rev. D
Self Cite
17
1
8
0
View full text Add to dashboard Cite