Featured
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Letter |
Testing sub-gravitational forces on atoms from a miniature in-vacuum source mass
Atomic interferometry measurements of the gravitational force on free-falling atoms provide improved constraints on certain scalar field theories trying to explain dark energy.
- Matt Jaffe
- , Philipp Haslinger
- & Holger Müller
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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 |
Exciting times
While axions remain elusive, the CERN Axion Solar Telescope has now reached the interesting region where physics beyond the standard model could be glimpsed.
- Maurizio Giannotti
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News & Views |
Alice in strangeland
An enhanced production of particles with strange quarks has been observed in high-multiplicity proton–proton collisions — an important clue to understand how strange quarks form, and perhaps a hint of the quark–gluon plasma.
- Francesco Becattini
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Article
| Open AccessNew CAST limit on the axion–photon interaction
Axions are hypothetical light particles that could explain the dark matter. They could be produced in the interior of the Sun and the CERN Axion Solar Telescope sets the best limit on how strongly axions can interact with light.
- V. Anastassopoulos
- , S. Aune
- & K. Zioutas
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Letter
| Open AccessEnhanced production of multi-strange hadrons in high-multiplicity proton–proton collisions
Quark–gluon plasma is an exotic state of matter that can emerge in heavy nuclei high-energy collisions. The ALICE collaboration reports the first observation of strangeness enhancement in proton–proton collisions, a possible signature of this state.
- J. Adam
- , D. Adamová
- & M. Zyzak
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News & Views |
Another piece of the puzzle
A study of Λb baryon decays has provided the first direct experimental evidence that spinning matter and antimatter differ. This result may help us understand the puzzling matter–antimatter imbalance in the Universe.
- Gauthier Durieux
- & Yuval Grossman
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Progress Article |
Current status of direct dark matter detection experiments
Direct dark matter searches are pushing the limits on the scattering of weakly interacting massive particles on normal matter so WIMPs are running out of places to hide.
- Jianglai Liu
- , Xun Chen
- & Xiangdong Ji
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Review Article |
Indirect dark matter searches in gamma and cosmic rays
Dark matter could decay into conventional particles leaving behind specific signatures in the gamma rays and cosmic rays. Astronomical observations are used to search for these elusive dark matter footprints.
- Jan Conrad
- & Olaf Reimer
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Progress Article |
Search for dark matter at colliders
Beyond the standard model, the weakly interacting massive particle (WIMP) hypothesis for dark matter is one of the most compelling, and the one being tested at the Large Hadron Collider.
- Oliver Buchmueller
- , Caterina Doglioni
- & Lian-Tao Wang
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Article
| Open AccessMeasurement of matter–antimatter differences in beauty baryon decays
CP violation has deep implications for particle physics and cosmology. Previously observed only in meson decays, signs of CP violation have now been spotted in baryon decays by analysing the proton–proton collision data from the LHCb detector.
- R. Aaij
- , B. Adeva
- & S. Zucchelli
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Editorial |
To boldly go
China is investing in big astronomy and astrophysics projects, but is still debating the way forward in experimental particle physics.
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Editorial |
Fantastic beasts
Elementary particles are the building blocks of matter, but there is also a zoo of quasiparticles that are crucial for understanding how this matter behaves.
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Feature |
The quasiparticle zoo
Quasiparticles are an extremely useful concept that provides a more intuitive understanding of complex phenomena in many-body physics. As such, they appear in various contexts, linking ideas across different fields and supplying a common language.
- Liesbeth Venema
- , Bart Verberck
- & Luke Fleet
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Measure for Measure |
The nature of natural units
Nick van Remortel demystifies natural unit systems — and advises what to do when you see a mass expressed in GeV.
- Nick van Remortel
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Measure for Measure |
A tale of two masses
The most precise measurements of the atomic masses of the proton and the electron make use of Penning traps, and for the latter, a hydrogen-like ion, as Edmund Myers explains.
- Edmund G. Myers
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Editorial |
Nullius in verba
A flurry of 'null results' have hit the physics headlines recently. They are only 'null' if you place no value in the information they provide.
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Progress Article |
The conformal bootstrap
A renaissance of interest in a numerical technique known as the conformal bootstrap is surveyed, and its implications for the determination of critical exponents in a range of spin models is discussed.
- David Poland
- & David Simmons-Duffin
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News & Views |
On the path to precision
The first results from the NOvA experiment confirm what we already know about neutrino oscillations. As data collection continues we are getting closer to finding the remaining unknown parameters.
- Ben Still
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News & Views |
Rogue waves caught in 3D
Three-dimensional rogue waves have been observed in a dusty-plasma system, which provides a wave–particle interaction view on their formation.
- Jeremiah Williams
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Letter |
Chiral magnetic effect in ZrTe5
A magnetotransport study of zirconium pentatelluride now reveals evidence for a chiral magnetic effect, a striking macroscopic manifestation of the quantum and relativistic nature of Weyl semimetals.
- Qiang Li
- , Dmitri E. Kharzeev
- & T. Valla
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Editorial |
Searching the invisible
After two Nobel prizes, the quest to uncover new physics continues at the Kamioka site in Japan.
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Research Highlights |
Nobel Prize 2015: Kajita and McDonald
The 2015 Nobel Prize in Physics has been awarded to Takaaki Kajita and Arthur B. McDonald "for the discovery of neutrino oscillations, which shows that neutrinos have mass".
- Andrea Taroni
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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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Letter
| Open AccessPrecision measurement of the mass difference between light nuclei and anti-nuclei
The abundant production of (anti-)nuclei in relativistic heavy-ion collisions provides a platform to test the CPT invariance of nucleon–nucleon interactions—offering the highest precision measurement to date in the light-nuclei sector.
- J. Adam
- , D. Adamová
- & M. Zyzak
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Article
| Open AccessDetermination 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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Commentary |
Look to the clouds and beyond
Research in high-energy physics produces masses of data, demanding extensive computational resources. The scientists responsible for managing these resources are now turning to cloud and high-performance computing.
- Sergey Panitkin
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News & Views |
Spacetime fuzziness in focus
Photons emitted by extragalactic sources provide an opportunity to test quantum gravity effects that modify the speed of light in vacuum. Studying the arrival times of these cosmic messengers further constrains the energy scales involved.
- Agnieszka Jacholkowska
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News & Views |
Higgs, Anderson and all that
The Higgs mechanism is normally associated with high energy physics, but its roots lie in superconductivity. And now there is evidence for a Higgs mode in disordered superconductors near the superconductor–insulator transition.
- Philip W. Anderson
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News & Views |
Time for detection
Dark matter remains experimentally elusive. But what if it is more classical than expected, resembling a spatially varying field? A network of atomic clocks would be able to detect its variations.
- Rana Adhikari
- , Paul Hamiton
- & Holger Müller
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Letter |
Hunting for topological dark matter with atomic clocks
A proposal for detecting dark matter originating from light fields rather than particles makes use of existing networks of atomic clocks to measure time discrepancies between clocks that are spatially separated.
- A. Derevianko
- & M. Pospelov
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Research Highlights |
Nobel Prize 2014: Akasaki, Amano & Nakamura
The 2014 Nobel Prize in Physics has been awarded to Isamu Akasaki, Hiroshi Amano and Shuji Nakamura "for the invention of efficient blue light-emitting diodes which has enabled bright and energy-saving white light sources."
- Joerg Heber
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News & Views |
Out of the darkness
The ALPHA collaboration has provided the clearest evidence yet that antihydrogen is charge neutral. Attention now turns to research that could replace a universe dominated by dark matter and dark energy with one containing both matter and antimatter.
- Thomas J. Phillips
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Letter
| Open AccessEvidence for the direct decay of the 125 GeV Higgs boson to fermions
From the manner of its discovery in 2012, it was apparent that the 125 GeV Higgs boson couples to bosons, but does it couple to fermions too? Yes, says the CMS Collaboration at CERN, who present combined evidence of Higgs decay to pairs of bottom quarks and pairs of tau leptons.
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News & Views |
Back to reality?
Holographic dualities discovered in string theory may provide methods for extracting the real-time response of quantum systems from numerical simulations performed in imaginary time.
- Joe Bhaseen