tag:blogger.com,1999:blog-2846514233477399562.post7535602349373684304..comments2024-01-08T09:37:04.406+01:00Comments on RÉSONAANCES: CoGeNT observes annual modulation!Jesterhttp://www.blogger.com/profile/08947218566941608850noreply@blogger.comBlogger17125tag:blogger.com,1999:blog-2846514233477399562.post-44287633950927484522011-06-25T22:16:11.425+01:002011-06-25T22:16:11.425+01:00Curve of 7 GeV WIMP prediction in 0.5-3 keV bin ha...Curve of 7 GeV WIMP prediction in 0.5-3 keV bin has amplitude too high by factor 2. Then fitted amplitude of 16 % can't be accounted by a 7 GeV WIMP expected to give modulation of 6 %. Check Schwetz at http://indico.cern.ch/conferenceTimeTable.py?confId=116616#all.detailed.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-39393263069949428912011-05-08T17:41:06.085+01:002011-05-08T17:41:06.085+01:00"The modulation is most pronounced in the 0.5..."The modulation is most pronounced in the 0.5-2 keV region while it is absent for surface events."<br /><br />that pretty much says it all...Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-29388451780430570162011-05-06T20:11:25.263+01:002011-05-06T20:11:25.263+01:00Anon at 07:19, could you elaborate a little or sug...Anon at 07:19, could you elaborate a little or suggest a ref?Chrishttp://chrisaustin.info/noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-20105147494668822902011-05-06T18:54:53.189+01:002011-05-06T18:54:53.189+01:00I was referring to 1007.1005 where they get an ove...I was referring to 1007.1005 where they get an overlap of CoGeNT and DAMA, but for Q_Na \sim 0.5, whereas DAMA quotes Q_Na = 0.3 \pm 0.01. Even assuming that the true error is a few times bigger than that, I agree that the quenching factor cannot be the whole story.Jesterhttps://www.blogger.com/profile/08947218566941608850noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-22506190918696679022011-05-06T13:40:06.099+01:002011-05-06T13:40:06.099+01:00Jester, large enough quenching factors for sodium ...Jester, large enough quenching factors for sodium recoils have been measured to bring DAMA and CoGeNT in near agreement, you should look at the large spread in those measurements. You are thinking about the value obtained by DAMA themselves, which is somewhere in the middle of the measured range. This uncertainty is however not enough to make CoGeNT and DAMA overlap. Something else is missing there.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-1324149440216783132011-05-06T13:32:33.118+01:002011-05-06T13:32:33.118+01:00CDMS and CoGeNT have very similar spectra.CDMS and CoGeNT have very similar spectra.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-53220546422266216962011-05-06T11:43:08.189+01:002011-05-06T11:43:08.189+01:00Anon-3, it's hard to say. DAMA and CoGeNT can ...Anon-3, it's hard to say. DAMA and CoGeNT can be explained using similar dark matter masses, but the cross sections don't match very well. One needs to assume the sodium quenching factor is much larger than what is measured to get a better agreement.<br />Anon-1, as long as it's the usual spin-independent elastic scattering the CDMS and Xenon limits apply, whether the force carrier is A' or something else.Jesterhttps://www.blogger.com/profile/08947218566941608850noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-59616910352788908212011-05-06T07:19:33.709+01:002011-05-06T07:19:33.709+01:00Actually, I think you'll find that the A' ...Actually, I think you'll find that the A' hypothesis is not ruled out by CDMS and Xenon.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-63967829049393993092011-05-06T06:50:09.627+01:002011-05-06T06:50:09.627+01:00For a connection between the more than two year ol...For a connection between the more than two year old<br />CDF anomaly and the recent dark matter discrepancy see<br /><a href="http://matpitka.blogspot.com/2011/05/puzzling-situation-in-dark-matter.html" rel="nofollow">this</a>.Matti Pitkänenhttps://www.blogger.com/profile/13512912323574611883noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-12295291848007986212011-05-06T00:20:00.955+01:002011-05-06T00:20:00.955+01:00Sorry, some naive question, but where does it pick...Sorry, some naive question, but where does it pick? does it agree with Dama or not?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-22158004279762588122011-05-05T22:30:14.388+01:002011-05-05T22:30:14.388+01:00Lorentz would be exhilarated to see this. Luminefe...Lorentz would be exhilarated to see this. Lumineferous aether at last?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-15257006965510109292011-05-05T21:44:12.163+01:002011-05-05T21:44:12.163+01:00I think it's unlikely that all three are so ba...I think it's unlikely that all three are so badly wrong.Jesterhttps://www.blogger.com/profile/08947218566941608850noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-76574878072339567342011-05-05T21:17:37.796+01:002011-05-05T21:17:37.796+01:00Jester, has it ever ocurred to you that some exper...Jester, has it ever ocurred to you that some experimental groups may be greatly exaggerating their sensitivity?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-15084569180379405122011-05-05T21:10:47.871+01:002011-05-05T21:10:47.871+01:00That explanation is subject to the CDMS and Xenon ...That explanation is subject to the CDMS and Xenon constraints, i think... you need something much more crazy.Jesterhttps://www.blogger.com/profile/08947218566941608850noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-49472201872111570162011-05-05T21:01:13.341+01:002011-05-05T21:01:13.341+01:00Thanks for the update. What is your opinion on th...Thanks for the update. What is your opinion on the claim on pages 7 to 16 of <a href="http://phy-gzk.princeton.edu/DMworkshop/Rouven_Essig.pdf" rel="nofollow">this talk by Rouven Essig</a> that a new neutral "dark force" gauge boson A' with mass \sim MeV to GeV and a kinetic mixing with the photon with coefficient 10^{-2} to 10^{-5} might explain both CoGeNT and DAMA, as well as PAMELA and Fermi cosmic ray excesses and the muon (g - 2) anomaly? The second half of the talk indicates that a direct search for the A' produced via bremsstrahlung by an electron beam on a tungsten target has been provisionally approved for a 30 day run at the Jefferson Lab possibly some time this year. Is there any way that something like this, with the unusual coupling via the kinetic mixing, could make CoGeNT and DAMA consistent with CDMS, Xenon10, and Xenon100?Chrishttp://chrisaustin.info/noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-31508131646008184922011-05-05T20:57:03.119+01:002011-05-05T20:57:03.119+01:00but they have different background rejection, for ...but they have different background rejection, for example CoGeNT does not cut on the ionization fraction. What if dark matter mimics electron recoils... unlikely, but not completely excluded.Jesterhttps://www.blogger.com/profile/08947218566941608850noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-24195384458132507072011-05-05T18:16:09.192+01:002011-05-05T18:16:09.192+01:00both CoGent and CDMS use germanium and they are in...both CoGent and CDMS use germanium and they are in the same place, so there seems to be a direct contradiction between their resultsASnoreply@blogger.com