News Archives – Page 130 of 251

CP violation proves elusive in the charm sector

Report of LHCb on CP violation in two decays.

TOTEM’s luminosity-independent cross-sections

The TOTEM collaboration has published the first luminosity-independent measurement of the total proton–proton cross-section at a centre-of-mass energy of 7 TeV.

ATLAS completes precision luminosity measurement

The success of the procedure for vdM scans at the LHC resulted from close co-operation between the LHC accelerator team and the four large experimental collaborations.

Supernova remnants accelerate cosmic rays

A century after the discovery of cosmic rays, NASA’s Fermi Gamma-ray Space Telescope has gathered strong evidence that protons are, indeed, accelerated to high-energies by supernova remnants (SN...

Proton–ion collisions: the final challenge

In the last beam period before a two-year shutdown, the LHC began 2013 with a challenge: proton–ion collisions.

Source of lead ions

Every so often the source of the lead ions has to be replaced.

ALICE and ATLAS find intriguing ‘double ridge’ in proton–lead collisions

In analysing data from last year’s test run with proton–lead collisions in the LHC, the ALICE collaboration, followed almost immediately and independently by the ATLAS collaboration, have ...

First measurements of electroweak boson fusion

In proton collisions at the LHC, vector boson fusion (VBF) happens when quarks from each one of the two colliding protons radiate W or Z bosons that subsequently interact or "fuse" as in the Feynman d...