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“Oh, Really?”, a possible fifth Force in the universe...
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<blockquote data-quote="freyar" data-source="post: 7861589" data-attributes="member: 40227"><p>Yeah, I'm a little surprised at how much press this got. </p><p></p><p>To add one point to what Umbran said, the way this low mass particle could have escaped detection until now is that it would have to be pretty weakly coupled. On the other hand, there are experiments that look for specifically this sort of thing (<em>not</em> the LHC which produces relatively few high-energy collisions, but other experiments that produce very many lower-energy ones), and they haven't found it. It seems like not all the parameter space is entirely closed, possibly, though.</p><p></p><p>But there are quite a few specific reasons to think that the experiment is not right. Anomalies like this just show up from time to time. And some real experts on this required type of statistical analysis think what's being done is naive. Anyway, it would be exciting if true, but it still seems less likely to be true than other recent anomalies that turned out to be incorrect in the end.</p><p></p><p>Here are some articles:</p><p><a href="https://profmattstrassler.com/2019/11/25/has-a-new-force-of-nature-been-discovered/" target="_blank">By a theorist, just giving a general take</a>.</p><p><a href="https://www.science20.com/tommaso_dorigo/the_17_mev_anomaly_that_would_not_die-243528" target="_blank">By an experimentalist with some specific criticism.</a></p><p><a href="https://www.forbes.com/sites/startswithabang/2019/11/26/this-is-why-the-x17-particle-and-a-new-fifth-force-probably-dont-exist/#33dd0de82e82" target="_blank">Mainstream media explanation by a credible science writer.</a></p></blockquote><p></p>
[QUOTE="freyar, post: 7861589, member: 40227"] Yeah, I'm a little surprised at how much press this got. To add one point to what Umbran said, the way this low mass particle could have escaped detection until now is that it would have to be pretty weakly coupled. On the other hand, there are experiments that look for specifically this sort of thing ([I]not[/I] the LHC which produces relatively few high-energy collisions, but other experiments that produce very many lower-energy ones), and they haven't found it. It seems like not all the parameter space is entirely closed, possibly, though. But there are quite a few specific reasons to think that the experiment is not right. Anomalies like this just show up from time to time. And some real experts on this required type of statistical analysis think what's being done is naive. Anyway, it would be exciting if true, but it still seems less likely to be true than other recent anomalies that turned out to be incorrect in the end. Here are some articles: [URL='https://profmattstrassler.com/2019/11/25/has-a-new-force-of-nature-been-discovered/']By a theorist, just giving a general take[/URL]. [URL='https://www.science20.com/tommaso_dorigo/the_17_mev_anomaly_that_would_not_die-243528']By an experimentalist with some specific criticism.[/URL] [URL='https://www.forbes.com/sites/startswithabang/2019/11/26/this-is-why-the-x17-particle-and-a-new-fifth-force-probably-dont-exist/#33dd0de82e82']Mainstream media explanation by a credible science writer.[/URL] [/QUOTE]
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