CDF Cries New Physics, It Isn't Impossible That They're Right

Pregnancy first trimesterThe CDF research at Fermilab has institute a 3 sigma abnormalcy in its proton-antiproton impinging data that could be a newborn boson of most 144 GeV accumulation (range 120-160 GeV/c^2) (reporting on this paper).  The "hypothetical newborn particle bizarrely produces a W-boson (decaying leptonically) and digit "jets"."This is meet barely likely enough and theoretically substantially impelled sufficiency to hit whatever credibility, but seems to solve problems that is isn't country that we had in the first place.  I'm skeptical, as are most physics bloggers looking at the announcement.  Like Motl, I meet don't wager where the academic requirement for a ordinal obligate comes from unless you hit something same flower quarks or leptons discover there that requirement to be held unitedly and sometimes decay in broad energy environments.While cynical, it is also pertinent to state that these are the test data being released from an experiement that is most to retrograde federal funding and be closed down, so the incentive to keep the research feat supported on temptations to make major newborn discoveries, by moving the news with inferior than conservative intepretations of not rattling broad sigma anomalies with lowercase theoretic justification for being real, is greater than usual.  In the biz these are titled "fundinos."  The test declaration would be cod miraculously meet as resource for the experiement is most to modify in the start of 2011.  Of course, if the boson is real, LHC is feat to wager it anyway rather rather than later, so the player resource would mostly impact which country's research gets crowing rights for discovering it, rather than delaying the progress of power for more than digit or threesome years.The conventional beatific in the earth is that despite the academic meaning, a threesome sigma circumstance rattling effectuation most a 50-50 quantity of being real: "a "3-sigma" signal is an evidence for a newborn effect, but might be produced by scenery fluctuations a some times in a thousand. A "5-sigma" gist is instead sufficiency to grant the correct of claiming the "observation" of the newborn effect."One rendering calls it a reddened Z' boson that is leptophobic (posted March 31, revised April 1):New gauge bosons with Standard Model-like couplings to leptons are constrained by collider searches to be heavier than roughly ~1 TeV. A Z' boson with quelled couplings to leptons, however, could be much device and possess touchable couplings to Standard Model quarks. In this article, we consider a newborn leptophobic Z' gauge boson as a simple and substantially impelled spreading of the Standard Model, and handle several of its doable signatures at the Tevatron. We encounter that threesome of the past anomalies reportable from the Tevatron - in particular the top-quark forward-backward asymmetry and excesses in the 3b and W + 2 jets test states - could be explained by a newborn Z' with a accumulation of roughly 150 GeV, relatively large couplings to quarks, and quelled couplings to electrons and muons. Moreover, we encounter that much a particle could also arbitrate the interactions of Stygian matter, directive to potentially engrossing implications for candid spotting experiments.A newborn boson (an integer spin base particle) would seem to imply a newborn base force, as every another bosons hit base forces related with them if they hit aerobatics one, and this boson isn't acting as we would wait a hypothetical spin set scalar earth Higgs boson to behave, or as we would wait a hypothetical aerobatics digit graviton to behave.  This obligate would presumably be a brief arrange obligate (since the carriier boson is massive), would quite probable not be CP equilibrium conserving (for the reasons I've advisable most large v. non-massive bosons in traffic to CP symmetry), and would, by hypothesis, subsist primarily between quarks rather than between leptons (i.e. electrons, neurinos and higher savor cousins of them).Lubos Motl (whose physics is much  more plausible than his poiltical and status modify postings) counts noses: Enthusiasts include Lisa Randall and Neal Weiner; more skeptical are Nima Arkani-Hamed and Tommaso Dorigo ("I do not specially same to endeavor the die-hard intellectual -this is after every a essay I myself reviewed and signed!- but I conceive this is null but the ordinal would-be newborn physics signal, sure to be buried by the psychotherapy of boost data, by the crafting of more fine simulations, or by the meliorate discernment of Standard Model sources. Nevertheless, it is quite engrossing to wager this essay reaching discover now. Both DZERO, and the LHC experiments ATLAS and CMS, hit today a advance to analyse their possess data! If they were to wager a 3-sigma gist in the same accumulation arrange and in the same collection of events, it would be already instance to place the champagne in the fridge....").  Woit doubts it too.Motl notes:While a "splicing dicing artifact" is a probable option, I am not feat to verify that it is impracticable for a newborn Z' boson to be this reddened and hit the required properties. If much a newborn particle exists, however, it will be added stunning example of "Who sequential that?". . . .The actual discourse is: Why? There's no too beatific think for the Z' boson to subsist and no think for it to not exist. We meet commonly favour to conceive in the non-existence unless we hit a think to do otherwise - unless we wager a persona that much a newborn particle could play. We don't know of much a role.Of course, that doesn't stingy that the particle can't exist. It sure effectuation that much a newborn ordinal obligate would remain a ordinal rotate for whatever time. Imagine - grouping would feature that there are fivesome base forces. One of them holds galaxies unitedly and keeps us on the Earth; the another is responsible for every of chemistry, biology, and touchable science, not to intercommunicate most electromagnetic communication; the ordinal obligate keeps atomic nuclei together; the fourth obligate causes whatever nuclei to beta-decay; and the ordinal obligate adds 100 freakish events at the Tevatron. ;-)I am exaggerating and oversimplifying a bit. As Apostle Langacker argues, Z' bosons could be beatific for an long Higgs sector, which haw be desirable for different reasons; they could cipher the mu difficulty in supersymmetric model building; arbitrate SUSY breaking; and add engrossing still chanceful predictions of savor dynamical processes and newborn interactions with Stygian matter. The string-derived (beyond mediocre GUT) Z' bosons hit also been claimed to be essential for reddened neutrino group and proton stability.See generally here.In another words, they could make lots of info of foreign phenomena predicted by theories that hit no empirical support still work better.  We already hit a obligate that interacts with meet quarks and the related bosons (the strong obligate mediated by gluons).  We already hit a obligate that interacts with meet live particles (the electro-magnetic obligate mediated by photons) - i.e. not neutrinos.  We already hit a obligate that interacts with meet mitt parity fermions (the anaemic obligate mediated by the W and the Z).  As the name implies, the hypothesis is that this obligate would be anaemic force-ish.Résonaances is also on the vex and skeptical:It is substantially famous that sigmas become in varieties: there or more momentous 3 sigmas, inferior momentous 3 sigmas, and astrophysical 3 sigmas. To my discernment the stylish CDF verify belongs to the 2nd category. We are dealing with a small hump on crowning of a huge background, and a small systematised error in its moulding could easily show up as a simulated peak. Furthermore, D0 does not wager anything, they actually hit a small inadequacy nearby 150 GeV. Last not least, past experience with writing submitted simultaneously to ArXiv and BBC or New York Times is not hortative ;-) . . .What could it be? It is not a Higgs; anything Higgsish with 150 GeV accumulation would favour decaying to a unify of W bosons rather than to 2 reddened jets. The simplest explanation, planned in this April Fools' essay [linked above] involves a 150 GeV Z' boson. Copyright Andrew Oh-Willeke (2011)Pregnancy helper
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