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Search for a common baryon source in high-multiplicity pp collisions at the LHC
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abstract
We report on the measurement of the size of the particle-emitting source from two-baryon correlations with ALICE in high-multiplicity pp collisions at $\sqrt{s}$ = 13 TeV. The source radius is studied with low relative momentum p-p, $\bar{\rm{p}}$-$\bar{\rm{p}}$, p-$\Lambda$ and $\bar{\rm{p}}$-$\bar{\Lambda}$ pairs as a function of the pair transverse mass $m_{\rm{T}}$ considering for the first time in a quantitative way the effect of strong resonance decays. After correcting for this effect, the radii extracted for pairs of different particle species agree. This indicates that protons, antiprotons, $\Lambda$, and $\bar{\Lambda}$ originate from the same source. Within the measured $m_{\rm{T}}$ range (1.1-2.2) GeV/$c^{2}$ the invariant radius of this common source varies between 0.85 and 1.3 fm. These results provide a precise reference for studies of the strong hadron-hadron interactions and for the investigation of collective properties in small colliding systems.
Forward citations
Cited by 11 Pith papers
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A femtoscopic tale of two $C$-parities: the $Z_c(3900)$ and the isovector partner of the $X(3872)$
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Quantum interference effects enhanced in $\pi^+p$ femtoscopic correlation functions
The π⁺p correlation peak near 140 MeV/c arises from quantum interference of incident and scattered waves, while the Δ decay peaks near 220 MeV/c; their m_T-dependent mix explains the ALICE peak shift.
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Proton-proton Femtoscopy as a Probe of Short-range Structure in High-Energy O+O Collisions
In simulated 16O+16O collisions at 200 GeV, proton-proton correlations shift the extracted source radius by about 5 percent when the oxygen input contains short-range nucleon correlations, while pion-pion correlations...
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Probing (Hyper)Nuclei Wave Functions and Production Mechanisms in $\sqrt{s_{\rm{NN}}}=200$ GeV Isobar Collisions at RHIC
Isobar collision yields of ³_ΛH and light nuclei favor coalescence with non-Gaussian hypertriton wave functions that carry enhanced short-distance d–Λ probability, inconsistent with a Gaussian ansatz tied to the measu...
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Light Antinuclei Coalescence: Femtoscopic Constraints via Neural-Flow Surrogates
A neural-flow emulator of the CECA femtoscopic source, fit to 49 ALICE pp correlation functions, reduces claimed uncertainties on antinuclei coalescence parameters B2 and B3 to a few percent and ~10% respectively.
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Signatures of Odd-Parity $s$-wave $\Xi^*$ States in Femtoscopic Correlation Functions
Using a unitarized hidden-gauge model, the authors dynamically generate Xi(1950)-like and Xi(2120)-like poles and predict femtoscopic correlation functions for six vector-baryon channels.
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Spectroscopic and femtoscopic insights into vector-baryon interactions in the strangeness $-1$ sector
The authors predict three Lambda* and two Sigma* resonances from vector-baryon interactions and provide femtoscopy correlation functions for six channels in the S=-1 sector.
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Femtoscopic study of the $S=-1$ meson-baryon interaction: $K^-p$, $\pi^-\Lambda$ and $K^+\Xi^-$ correlations
Chiral unitary models reproduce the measured kaon-proton correlation and give first predictions for pion-Lambda and kaon-Xi-minus correlations using new production-weight methods.
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Learning Hadron Emitting Sources with Deep Neural Networks
A neural-network source function fitted to ALICE proton-proton correlation data gives a lower chi-squared than a Gaussian and reveals a long-tailed emitting source.
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Toward universal coalescence models for antideuteron production
Event-by-event coalescence models with a shared scale p_coal ≃ 0.2 GeV (or δ ≃ 1.7 fm) simultaneously fit ALICE pp (anti)deuteron spectra and ALEPH Z-decay antideuteron yields.
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Production of exotic hadrons in $pp$ and nuclear collisions
A review of exotic-hadron production in pp, pbar-p, and nuclear collisions, arguing that such measurements can discriminate between hadronic-molecule and compact-tetraquark interpretations of states like the X(3872).
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