tag:blogger.com,1999:blog-2846514233477399562.post2487276944275560367..comments2024-01-08T09:37:04.406+01:00Comments on RÉSONAANCES: Weekend Plot: BaBar vs Dark Force Jesterhttp://www.blogger.com/profile/08947218566941608850noreply@blogger.comBlogger15125tag:blogger.com,1999:blog-2846514233477399562.post-21151756116614965212014-07-19T10:08:12.796+01:002014-07-19T10:08:12.796+01:00Guys, sorry for late replies, I was closed for sum...Guys, sorry for late replies, I was closed for summer. <br /><br />askaboutphysics.dk: i blogged about it here http://resonaances.blogspot.fr/2014/02/signal-of-neutrino-dark-matter.html <br />and there will soon be a follow-up. <br /><br />alex: Yes :) <br /><br />Anon: It's true but "dark photon" is a cool name, better than "hidden photon". Personally i call dark photon rather than Z' as long as it is light enough such that its couplings to matter are proportional to the electric charge.<br /><br />David: It's true that currently there's neither theoretical nor phenomenological motivations for dark photons. It's just a toy model for new physics that is light but hidden from the usual collider searches. Jesterhttps://www.blogger.com/profile/08947218566941608850noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-38081531730745601662014-07-16T13:33:50.319+01:002014-07-16T13:33:50.319+01:00"Dark photon is a hypothetical spin-1 one bos..."Dark photon is a hypothetical spin-1 one boson that couples to other particles with a strength proportional to their electric charges." My impression is that the majority of physicists strongly doubt the existence of the dark photon and that the graviton, the inflaton, the axion, the matter magnetic monopole, and the antimatter magnetic monopole are the only undiscovered particles that they would vote in favor of. Is my impression correct?David Brownhttps://www.blogger.com/profile/10537922851243581921noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-27509987675026563982014-06-30T00:45:39.929+01:002014-06-30T00:45:39.929+01:00There is no dark matter in Bob Holdom's model ...There is no dark matter in Bob Holdom's model (He mixed 2 U(1)s Kinetically - which in fact one can get most naturally in supergravity with a nontrivial gauge kinetic function). Dark Matter came into the picture later on... Dark Photon is a poor label anyway, the extra spin 1 particle mass discussed is much closer to a Z prime mass than a photon (which has zero mass)...nevertheless....let the jargon parade on.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-71652367439487880672014-06-29T20:22:37.997+01:002014-06-29T20:22:37.997+01:00So, you ever gonna blog again or not?So, you ever gonna blog again or not?Alexnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-76487064580531793892014-06-26T15:08:51.706+01:002014-06-26T15:08:51.706+01:00Hi Jester,
Along the lines of Dark Photons, do yo...Hi Jester, <br />Along the lines of Dark Photons, do you have any comments to the claim of 3+ sigma sterile neutrino spectral line at 7keV from Chandra?<br />e.g. : http://arxiv.org/abs/1402.2301<br /><br />I guess it might be hard to say if it is anything but instrumentation for anybody but the people involved in the experiment...askhttp://askaboutphysics.dknoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-13043797215650767812014-06-26T08:17:48.710+01:002014-06-26T08:17:48.710+01:00Along the lines of Dark Photons it would be intere...Along the lines of Dark Photons it would be interesting on your take on the new keV line seen by chandra at ~7keV that 'could' originate from sterile neutrinos. http://iopscience.iop.org/0004-637X/789/1/13/<br /><br />If I understand correctly (im a particle physicist and not an astronomer) the line is seen in 3 seperate channels above 3 sigma, but at the limit of instrumentation, so I guess it could well be a dud still...<br />askaboutphysics.dknoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-46790294546458478812014-06-21T03:21:43.641+01:002014-06-21T03:21:43.641+01:00LHC(CMS): No "excited quarks"<br />LHC(CMS): No "excited quarks"Robert L. Oldershawhttps://www.blogger.com/profile/15396555790655312393noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-27861222685121275552014-06-20T10:37:10.810+01:002014-06-20T10:37:10.810+01:00No exciting news either from the "God" s...No exciting news either from the "God" space accelerator and its American cosmic rays spectrometer AMS02 (the only living part in the sky of the late SSC so to speak, thanks to Samuel Ting ;-)<br />http://ams.nasa.gov/Documents/AMS_Publications/NASA%20JUNE-2014C.pdfcbhttps://www.blogger.com/profile/03349828290008437401noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-80189932791165752642014-06-16T20:48:26.824+01:002014-06-16T20:48:26.824+01:00Yeah, I'm aware of this, but i need to do some...Yeah, I'm aware of this, but i need to do some more research to decide whether it's serious. Jesterhttps://www.blogger.com/profile/08947218566941608850noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-13869272355815086902014-06-16T15:13:45.260+01:002014-06-16T15:13:45.260+01:00Jester -- Any comments on LHCb's latest talks ...Jester -- Any comments on LHCb's latest talks on 2.5 sigma results showing 25% discrepancy in universality of b decays predicted by std model? https://cds.cern.ch/record/1706212/files/LHCb-TALK-2014-108.pdf<br /> and http://www.symmetrymagazine.org/article/june-2014/lhcb-glimpses-possible-sign-of-new-physicsAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-34683841653716716502014-06-15T21:58:33.302+01:002014-06-15T21:58:33.302+01:00Ooops, sorry, fixed. Ooops, sorry, fixed. Jesterhttps://www.blogger.com/profile/08947218566941608850noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-5246034895849147342014-06-15T21:22:48.671+01:002014-06-15T21:22:48.671+01:00I think the first link is wrong.I think the first link is wrong.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-49987177837871978672014-06-15T21:09:28.053+01:002014-06-15T21:09:28.053+01:00The paper is on arxiv since February. But that'...The paper is on arxiv since February. But that's true: I should write one day about the progress in searches for the neutrinoless beta decay. Jesterhttps://www.blogger.com/profile/08947218566941608850noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-10150170304520727082014-06-15T19:52:23.200+01:002014-06-15T19:52:23.200+01:00As long as we're talking about new results, an...As long as we're talking about new results, any comment on the EXO paper in Nature?Alexnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-60223551711479362372014-06-15T15:52:40.517+01:002014-06-15T15:52:40.517+01:00
No doubt the paisley rainbow and the pot of whate...<br />No doubt the paisley rainbow and the pot of whatever particles is just over the next hill.<br /><br />If one is neck-deep in the Big Muddy, what is there to do but to press on.Robert L. Oldershawhttps://www.blogger.com/profile/15396555790655312393noreply@blogger.com