Examination of coalescence as the origin of nuclei in hadronic collisions

Bellini, F.; Blum, Kfir; Kalweit, A.; Puccio, M.

doi:10.1103/physrevc.103.014907

Cited by 44 publications

(57 citation statements)

References 59 publications

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“…As remarked in Ref. [35], this may be justified for heavy ion collisions where the size of the produced nuclear clusters can be neglected compared to the size of the emitting source. However, a more careful treatment is warranted for small interacting systems.…”

Section: Relation To the Femtoscopy Frameworkmentioning

confidence: 98%

“…In a similar fashion, the emission volume can be related to the coalescence factor B A , as was done in Refs. [25,34,35]. However, in order to derive their analytic relationship, the so-called smoothness approximation [63] was applied on top of the sudden approximation used in the previous section.…”

Section: Relation To the Femtoscopy Frameworkmentioning

confidence: 99%

“…Following the authors of Refs. [34,35], we assume for simplicity E d /(E p E n ) = 2/m N in the deutron rest frame. Then the coalescence factor (1) becomes…”

Section: Relation To the Femtoscopy Frameworkmentioning

confidence: 99%

“…A key observation in all approaches relying on the phase space picture is that the coalescence probability depends on the size of the hadronic emission region, which can be measured in femtoscopy (often also called Hanburry-Twiss-Brown) correlation experiments [25]. This connection has recently been applied to pp collisions, both in cosmic ray [33] and LHC studies [34,35]. In particular, it was argued in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, it was argued in Ref. [35] that the success of the femtoscopy analysis is strong evidence that coalescence is the major production mechanism of light nuclei. Moreover, these authors suggested that the use of experimental data from femtoscopy correlation experiments allows one to reliably predict the yield of light antinuclei in cosmic ray interactions, thereby avoiding the need of additional theoretical inputs.…”

Section: Introductionmentioning

confidence: 99%

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On nuclear coalescence in small interacting systems

2021

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The formation of light nuclei can be described as the coalescence of clusters of nucleons into nuclei. In the case of small interacting systems, such as dark matter and $$e^+e^-$$ e + e - annihilations or pp collisions, the coalescence condition is often imposed only in momentum space and hence the size of the interaction region is neglected. On the other hand, in most coalescence models used for heavy ion collisions, the coalescence probability is controlled mainly by the size of the interaction region, while two-nucleon momentum correlations are either neglected or treated as collective flow. Recent experimental data from pp collisions at LHC have been interpreted as evidence for such collective behaviour, even in small interacting systems. We argue that these data are naturally explained in the framework of conventional QCD inspired event generators when both two-nucleon momentum correlations and the size of the hadronic emission volume are taken into account. To include both effects, we employ a per-event coalescence model based on the Wigner function representation of the produced nuclei states. This model reproduces well the source size for baryon emission and the coalescence factor $$B_2$$ B 2 measured recently by the ALICE collaboration in pp collisions.

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Section: Relation To the Femtoscopy Frameworkmentioning

confidence: 98%

Section: Relation To the Femtoscopy Frameworkmentioning

confidence: 99%

“…Following the authors of Refs. [34,35], we assume for simplicity E d /(E p E n ) = 2/m N in the deutron rest frame. Then the coalescence factor (1) becomes…”

Section: Relation To the Femtoscopy Frameworkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On nuclear coalescence in small interacting systems

2021

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Production of light (anti)nuclei in pp collisions at $$ \sqrt{s} $$ = 13 TeV

Acharya

Adamová²,

Adler³

et al. 2022

J. High Energ. Phys.

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Understanding the production mechanism of light (anti)nuclei is one of the key challenges of nuclear physics and has important consequences for astrophysics, since it provides an input for indirect dark-matter searches in space. In this paper, the latest results about the production of light (anti)nuclei in pp collisions at $$ \sqrt{s} $$ s = 13 TeV are presented, focusing on the comparison with the predictions of coalescence and thermal models. For the first time, the coalescence parameters B2 for deuterons and B3 for helions are compared with parameter-free theoretical predictions that are directly constrained by the femtoscopic measurement of the source radius in the same event class. A fair description of the data with a Gaussian wave function is observed for both deuteron and helion, supporting the coalescence mechanism for the production of light (anti)nuclei in pp collisions. This method paves the way for future investigations of the internal structure of more complex nuclear clusters, including the hypertriton.

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