- Start
- Jul 7, 201790% CONFIDENCEfrom the source
- End
- Jul 8, 201790% CONFIDENCEfrom the source
A New Doubly Charmed Particle Has Just Been Discovered in CERN
- The LHCb collaboration at CERN announced the observation of Xi_cc++, a baryon with two charm quarks and one up quark, at the EPS Conference on High Energy Physics in Venice in early July 2017[1][2][3]
- Its mass is about 3621 MeV, almost four times that of a proton; all previously observed baryons contained at most one heavy quark[1][2]
- The particle had long been predicted by theory but never observed[1][2][3]
- It was identified through its decay to a Lambda_c+ baryon plus K-, pi+ and pi+, using 13 TeV run 2 data confirmed with 8 TeV run 1 data; the paper was submitted to Physical Review Letters[2][3]
- Spokesperson Giovanni Passaleva said it is a unique tool to probe quantum chromodynamics, and Guy Wilkinson said it should behave like a planetary system, with a whole family of doubly charmed baryons predicted[1][2][3]
- Lead physicist Patrick Spradlin (University of Glasgow) announced the result, with participation from University of Birmingham scientists and eleven UK institutes[3]
References 385% CONFIDENCE
The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
- [1]90%interestingengineering.com/new-doubly-charmed-particle-discovered-cerninterestingengineering.com· Posted Jul 23, 2017· Starts Jul 7, 2017 ✓· Ends Jul 8, 2017 ✓· 35% of score
Happened as dated, per interestingengineering.com: "…HCb) collaboration at CERN, Switzerland announced their observation of a new particle with two charm…"
- [2]85%The LHCb experiment is charmed to announce observation of a new particle with two heavy quarkssciencedaily.com· Published Jul 8, 2017· 33% of score
ScienceDaily reports the LHCb collaboration "has reported the observation of ΞCC++ (Xicc++)," published 8 July 2017, a day after the pin's stored 7 July date but within its window, corroborating the discovery.
- [3]80%CERN experiment discovers a new, very charming particlebirmingham.ac.uk· Published Jul 6, 2017· 33% of score
University of Birmingham's own release states the LHCb experiment "has discovered a brand new heavy particle," published 6 July 2017, a day before the pin's stored date, likely reflecting an early release ahead of the wider CERN conference announcement.
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