Read article 'Rare decay puts Standard Model on the spot'
The decay rate of the B0s meson to two muons is a flagship measurement in flavour physics. It is extremely rare and well predicted in the Standard Model (SM), with a branching fraction of (3.65±0.23)...
Read article 'BaBar casts further doubt on dark photons'
Dark photons, are hypothetical low-mass spin-1 particles that couple to dark matter but have vanishing couplings with normal matter. Such a boson, which may be associated with a U(1) gauge symmetry in...
Read article 'Gravitational lens challenges cosmic expansion'
An international group of astronomers has made an independent measurement of how fast the universe is expanding.
Read article 'BASE boosts precision of antiproton magnetic moment'
The measurement shows that the magnetic g-factors are identical within 0.8 parts per million.
Read article 'SESAME sees first beam'
Late in the evening of 12 January, a beam of electrons circulated for the first time in the SESAME light source in Jordan. Following the first single turn, the next steps will be to achieve multi-tur...
Read article 'Machine technical stop in full swing'
Following a record year of proton–proton operations at the LHC in 2016, which was followed by a successful proton–lead run, on 5 December 2016 the machine entered a longer than usual winter shutd...
Read article 'LHCb sees first hints of CP violation in baryons'
The LHCb experiment has uncovered tantalising evidence that baryons made of matter behave differently to those made of antimatter, violating fundamental charge-parity (CP) symmetry. Although CP-violat...
Read article 'ATLAS takes a new angle on the top quark'
The first analysis concerns the polarisation of W bosons produced in the decays of top-quark–antiquark pairs.
Read article 'ALICE studies beauty in the quark–gluon plasma'
In high-energy nucleus–nucleus collisions, heavy-flavour quarks (charm and beauty) are produced on a very short time scale in initial hard-scattering processes and thus they experience the entire ev...
Read article 'CMS probes non-standard Higgs decays to ττ'
Observing the Higgs via its decays into pairs of fermions further tests the predictions of the Standard Model.
