'New physics' charmingly escapes us


The Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences


Prof. Witek led a five-member group of physicists from Cracow searching for nonresonant decays of charmed baryon Lambda c in data collected in 2011 and 2012 by the international LHCb experiment at the Large Hadron Collider in Geneva. Why was the attention of the researchers drawn this time to Lambda c baryons, i.e. particles made of down (d), up (u) and charm (c) quarks? The Standard Model predicts that nonresonant decays of Lambda c baryons into three particles: a proton and two muons, should occur more or less once in hundreds of billions of decays. During the analyses, the Cracow-based researchers also observed resonant decays, in which the Lambda c baryon decayed into a proton and omega meson. The Henryk Niewodniczanski Institute of Nuclear Physics (IFJ PAN) is currently the largest research institute of the Polish Academy of Sciences.


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