Triangle singularity in $$B^-\rightarrow K^-X(3872);X\rightarrow \pi ^0\pi ^+\pi ^-$$ and the X(3872) mass

Molina, R.; Oset, E.

doi:10.1140/epjc/s10052-020-8014-7

Cited by 22 publications

(11 citation statements)

References 39 publications

(56 reference statements)

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“…[21,[26][27][28][29][30][31][32][33][34][35][36][37][38]; for other EFT analyses of the χ c1 (3872) see Refs. [39][40][41][42][43][44][45][46][47][48][49][50][51][52]. The main difference here is that there are two nearly degenerate channels so we will have to solve the coupled channel problem for D 0 D * + and D + D * 0 .…”

mentioning

confidence: 99%

$T_{cc}^+$ decays: Differential spectra and two-body final states

Fleming,

Hodges,

Mehen

2021

Preprint

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The recently discovered tetraquark, T + cc , has quark content ccū d and a mass that lies just below open charm thresholds. Hence it is reasonable to expect the state to have a significant molecular component. We calculate the decay of the T + cc in a molecular interpretation using effective field theory. In addition we calculate differential spectra as a function of the invariant mass of the final state charm meson pair. These are in good agreement with spectra measured by LHCb. We also point out that if shallow bound states of two pseudoscalar charm mesons exist, then two-body decays to those bound states and a single pion or photon can significantly enhance the width of the T + cc .

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confidence: 99%

$T_{cc}^+$ decays: Differential spectra and two-body final states

Fleming,

Hodges,

Mehen

2021

Preprint

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“…: V,-vol Fig. 1 Triangle diagram for the reaction A → BC, possibly yielding a triangle singularity [13]…”

Section: Formalism: Triangle Loop At Finite Tmentioning

confidence: 99%

“…Now we examine another triangle singularity that appears in the decay X (3872) → π 0 π + π − due to the intermediate [13] D * D D triangle. The interest in this singularity is the possibility to use it to precisely determine the mass of the [36,37] on radiative decays of the X that would be less germane to heavy ion collisions.…”

Section: A Triangle Singularity In X (3872) → πππmentioning

confidence: 99%

“…Serve as example the recent claim [5] that the a 1 (1420) is no axial-vector meson resonance but such triangle singularity instead [6,7]. There are several works that explain the mechanism [4,[8][9][10][11][12][13]: in brief, the triangle singularity, that receives its name from the Feynman diagram in Fig. 1 happens when the three intermediate particles become on shell and two have parallel momenta, if such kinematics is allowed.…”

Section: Introductionmentioning

confidence: 99%

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Heating triangle singularities in heavy ion collisions

Abreu

Llanes-Estrada

2021

Eur. Phys. J. C

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We predict that triangle singularities of hadron spectroscopy can be strongly affected in heavy ion collisions. To do it we examine various effects on the singularity-inducing triangle loop of finite temperature in the terminal hadron phase. It appears that peaks seen in central heavy ion collisions are more likely to be hadrons than rescattering effects under two conditions. First, the flight-time of the intermediate hadron state must be comparable to the lifetime of the equilibrated fireball (else, the reaction mostly happens in vacuo after freeze out). Second, the medium effect over the triangle-loop particle mass or width must be sizeable. When these (easily checked) conditions are met, the medium quickly reduces the singularity: at T about 150 MeV, even by two orders of magnitude, acting then as a spectroscopic filter.

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“…[12][13][14][15]. Some other recent examples can be seen in [16][17][18] and a rather complete list of reactions studied along TS is given in Ref. [5].…”

Section: Introductionmentioning

confidence: 99%

$Λ(1405)$ mediated triangle singularity in the $K^-d\to pΣ^-$ reaction

Feijoo¹,

Molina²,

Dai³

et al. 2021

Preprint

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We study for the first time the pΣ − → K − d and K − d → pΣ − reactions close to threshold and show that they are driven by a triangle mechanism, with the Λ(1405), a proton and a neutron as intermediate states, which develops a triangle singularity close to the Kd threshold. We find that a mechanism involving virtual pion exchange and the K − p → π + Σ − amplitude dominates over another one involving kaon exchange and the K − p → K − p amplitude. Moreover, of the two Λ( 1405) states, the one with higher mass around 1420 MeV, gives the largest contribution to the process. We show that the cross section, well within measurable range, is very sensitive to different models that, while reproducing KN observables above threshold, provide different extrapolations of the KN amplitudes below threshold. The observables of this reaction will provide new constraints on the theoretical models, leading to more reliable extrapolations of the KN amplitudes below threshold and to more accurate predictions of the Λ(1405) state of lower mass. A 2 3 1 B C FIG. 1. Feynman diagram from where a triangle singularity can emerge. Particle A decays into 1 and 2, 1 decays into B and 3, and 2 and 3 merge to form particle C.

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Triangle singularity in $$B^-\rightarrow K^-X(3872);X\rightarrow \pi ^0\pi ^+\pi ^-$$ and the X(3872) mass

Cited by 22 publications

References 39 publications

$T_{cc}^+$ decays: Differential spectra and two-body final states

$T_{cc}^+$ decays: Differential spectra and two-body final states

Heating triangle singularities in heavy ion collisions

$Λ(1405)$ mediated triangle singularity in the $K^-d\to pΣ^-$ reaction

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