Talk:Y(4140)
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Mass of Y(4140)
[edit]The article Mahajan, Namit (2009). "Y(4140): Possible options". arXiv:0903.3107. mentions 4143.0 ± 2.9 ± 1.2 MeV. Is that the mass of Y(4140)? What's the ±1.2, is it some kind of standard deviation of the standard deviation? Κσυπ Cyp 07:26, 22 March 2009 (UTC)
The first one is "systematic" error while the other is "statistical" error (both are standard deviations). Headbomb {ταλκκοντριβς – WP Physics} 03:34, 26 March 2009 (UTC)
"Particle" is too strong
[edit]The resonant phase motion of this peak is not measured, and it isn't observed at all by dedicated B-physics experiments. It could easily be a reflection or other background effect, particularly since all of the analyses that claim to see this state use a very naïve phase space background model.
Therefore I propose to call it a "particle candidate" or "exotic hadron candidate" until either a convincing Argand diagram is published, or it is shown to be something else.