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Anisotropic flow in Xe–Xe collisions
Anisotropic flow coefficients in Xe–Xe collisions at centre of mass energy per-nucleon of 5.44 TeV and Pb–Pb collisions at 5.02 TeV, shown with comparisons to predictions from hydrodynamic models. One...
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Jefferson Lab inaugurates upgraded CEBAF
Left to right: US Department of Energy undersecretary for science Paul Dabbar, Jefferson Lab director Stuart Henderson and congressman Bobby Scott in the new experimental hall D. Credit: Jefferson Lab...
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LHCP reports from Bologna
The LHCP participants in the San Domenico Centre. Credit: R Serra/FotoBouque Some 450 researchers from around the world headed to historic Bologna, Italy, on 4–9 June to attend the sixth Large Hadron...
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Probing quark–gluon plasma with charmed mesons
The ALICE collaboration has released a new measurement of the production of D0, D+, D*+ and Ds+ mesons, which contain a charm quark, in lead–lead (PbPb) collisions at a centre-of-mass energy per...
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Electron–ion collider on the horizon
Image credit: Jefferson Lab. Protons and neutrons, the building blocks of nuclear matter, constitute about 99.9% of the mass of all visible matter in the universe. In contrast to more familiar atomic...
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Fixed-target physics in collider mode at LHCb
The J/ψ cross-section, measured with the 4 TeV LHC proton beam hitting gaseous helium (red point) compared to previous experimental results (black) and a fit based on theoretical calculations (yellow)....
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First low-mass dielectron results ahead of LHC Run 3
Dielectron cross section as a function of invariant mass measured in pp collisions at a centre-of-mass energy of 7 TeV (red) and 13 TeV (blue), as well as Pb–Pb collisions at a centre-of-mass energy of...
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Suppression of the Λ(1520) resonance in Pb–Pb collisions
The pT-integrated ratio of Λ(1520)/Λ production as a function of charged-particle multiplicity, also showing predictions from several models. The ALICE collaboration has recently reported the first...
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Λc+-baryon probes charm-quark hadronisation
The Λc+/D0 baryon-to-meson ratio as a function of pT in the 0–80% most central Pb–Pb collisions, compared with the measurements in pp and p–Pb collisions and predictions from models (S Plumari et al....
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New measurements shine a light on the proton
A report from the ALICE experiment The electromagnetic field of the highly charged lead ions in the LHC beams provides a very intense flux of high-energy quasi-real photons that can be used to probe...
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CASTOR calorimetry delves into gluon saturation
A report from the CMS experiment The fundamental structure of nucleons is described by the properties and dynamics of their constituent quarks and gluons, as described by QCD. The gluon’s...
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Bottomonium suppression in lead–lead collisions
A report from the ALICE experiment The study of the production of quarkonia, the bound states of heavy quark–antiquark pairs, is an important goal of the ALICE physics programme. The quarkonium yield...
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New pentaquarks resolved by LHCb
Fig. 1. The LHCb collaboration has discovered a new pentaquark, and resolved a previously discovered peak into two. The Λb0 → J/ψpK− data sample was fitted with three narrow resonances (blue, purple...
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ALICE sheds new light on high-pT suppression
Fig. 1. Left: nuclear-modification factor versus pT for 5% wide centrality classes, showing the suppression of high-pT particle production in Pb–Pb collisions. The most peripheral 25% of ion collisions...
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The proton laid bare
Every student of physics learns that the nucleus was discovered by firing alpha particles at atoms. The results of this famous experiment by Rutherford in 1911 indicated the existence of a...
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Studying neutron stars in the laboratory
A report from the ALICE experiment Fig. 1. p-Ξ– correlation as a function of the relative momentum of the proton and Ξ–, and the expected background contribution. The models show theoretical...
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New constraints on charm–quark hadronisation
Fig. 1. The Λ+c/D0 production cross-section ratio versus transverse momentum for pp and PbPb collisions, with predictions from various pp-collision models. One of the most useful ways to understand the...
View ArticleHeavy ions and hidden sectors
The first dedicated workshop on searches for new physics in heavy-ion collisions took place at the Université Catholique de Louvain, Belgium, on 4–5 December 2018. The meeting was inspired by several...
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Bottomonium elliptic-flow no-show
Fig. 1. ϒ(1S) elliptic flow versus pT for the 5–60% centrality interval. (Centrality estimates the degree of overlap between the two colliding nuclei, with 0% corresponding to head-on collisions.) The...
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Quark-matter mysteries on the run in Bari
Golden age SQM 2019 highlighted the fast pace of developments in heavy-ion research. Credit: D Elia The XVIII International Conference on Strangeness in Quark Matter (SQM 2019) was held from 10 to 15...
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