Featured
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News & Views |
It’s all about symmetry
Ten years after the discovery of the Higgs boson, the ATLAS Collaboration probes its underlying mechanism, the electroweak symmetry breaking, by measuring the scattering of Z bosons, one of the mediators of the weak interactions.
- Pietro Govoni
- & Andrea Massironi
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Article
| Open Access
Observation of electroweak production of two jets and a Z-boson pair
The ATLAS Collaboration reports the observation of the electroweak production of two jets and a Z-boson pair. This process is related to vector-boson scattering and allows the nature of electroweak symmetry breaking to be probed.
- G. Aad
- , B. Abbott
- & L. Zwalinski
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News & Views |
Three’s the charm
In proton–proton collisions, the CMS Collaboration measures the simultaneous production of three particles, each consisting of a charm quark and a charm antiquark, which yields insights into how the proton’s constituents interact.
- Jonathan Gaunt
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News & Views |
Higgs bosons off the shell
The CMS Collaboration finds evidence for the contribution from off-shell Higgs bosons to the production of events with two Z bosons. This provides a measurement of the Higgs boson’s width.
- Thomas R. Junk
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Editorial |
Higgs Higgs hooray
We celebrate the ten-year anniversary of the discovery of the Higgs boson — a whopping 48 years after its prediction.
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Comment |
I knew we had it
As we celebrate the ten-year anniversary of the discovery of the Higgs boson, CERN’s Director-General at that time reminisces about the years leading up to this milestone.
- Rolf-Dieter Heuer
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News & Views |
A tetraquark trophy
The hunt for new particles helps to complete our understanding of hadronic matter. The LHCb Collaboration now reports the surprising observation of a doubly charmed tetraquark.
- Zhiqing Liu
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Letter
| Open Access
Observation of an exotic narrow doubly charmed tetraquark
The LHCb Collaboration reports the observation of an exotic, narrow, tetraquark state that contains two charm quarks, an up antiquark and a down antiquark.
- R. Aaij
- , A. S. W. Abdelmotteleb
- & G. Zunica
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Article
| Open Access
Precise determination of the \(B_{\mathrm{s}}^0\)–\(\overline B_{\mathrm{s}}^0\) oscillation frequency
The LHCb collaboration reports an improved measurement of the oscillation frequency of mesons consisting of a bottom quark and strange quark, which is then combined with previous results.
- R. Aaij
- , C. Abellán Beteta
- & G. Zunica
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Article
| Open Access
Test of the universality of τ and μ lepton couplings in W-boson decays with the ATLAS detector
The ATLAS Collaboration reports a measurement of the ratio of the decay rates of W bosons to τ leptons and muons, in agreement with universal lepton couplings as postulated in the standard model of particle physics.
- G. Aad
- , B. Abbott
- & L. Zwalinski
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Article |
Deeply virtual Compton scattering off the neutron
The internal structure of the neutron has now been probed by highly energetic photons scattering off it. Combined with previous results for protons, these measurements reveal the contributions of quark flavours to the nucleon structure.
- M. Benali
- , C. Desnault
- & P. Zhu
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News & Views |
Nearly perfect quark–gluon fluid
A statistical analysis of data from ultra-relativistic heavy-ion collisions has uncovered the specific viscosities of the quark–gluon plasma — suggesting that the hottest matter in the current Universe behaves like a near-perfect fluid.
- Kari J. Eskola
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Letter |
Neutrino tomography of Earth
Geophysical properties of the Earth’s interior have been inferred by looking at the absorption of neutrinos as they pass through our planet.
- Andrea Donini
- , Sergio Palomares-Ruiz
- & Jordi Salvado
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Measure for Measure |
Deviations from 2
Alberto Moscatelli surveys a series of experiments on the electron g-factor that marked the departure from the Dirac equation and contributed to the development of quantum electrodynamics.
- Alberto Moscatelli
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News & Views |
From generation to generation
A new measurement from the LHCb experiment at CERN's Large Hadron Collider impinges on a puzzle that has been troubling physicists for decades — namely the breaking of the symmetry between matter and antimatter.
- Robert Kowalewski
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Article
| Open Access
Determination of the quark coupling strength |Vub| using baryonic decays
The accurate determination of quark mixing parameters is essential for the understanding of the Standard Model. The LHCb collaboration now reports the coupling strength of the b quark to the u quark through the measurement of a baryonic decay mode.
- R. Aaij
- , B. Adeva
- & L. Zhong
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Consequences of the renormalization group for perturbative quantum chromodynamics
Watch out for the W