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New Bounds On the Higgs Boson Mass

As the LHC continues to run at half power for the next year+, the US-based Tevatron continues to crank out results. Reader hweimer writes "Three new papers in Physical Review Letters present the latest results for the Higgs boson mass coming from Fermilab's Tevatron. The new data mandates that the Higgs boson mass within the standard model lies between 115 and 150 GeV." A year back we discussed the Tevatron's previous shrinking of the search space for the Higgs "God particle."

41 of 173 comments (clear)

  1. Re:first!!!!!! by blakelarson · · Score: 3, Funny

    I'd say your place lies between first and eighth...

  2. Re:Conversion to mass in kg by cytoman · · Score: 4, Informative
    1 GeV/c^2 = 1.783 x 10^-27 kg.

    I didn't preview my previous comment and so it came out all wrong.

  3. To be clear what this means. by JoshuaZ · · Score: 5, Interesting

    These are bounds for the mass of the Higgs boson assuming it exists. If it doesn't exist, this data is meaningless. What will presumably eventually happen is that we'll narrow the mass down to a very tiny bound (if it exists) which would be strong evidence for its existence. Or we might detect the Higgs boson using some other methods and higher energies, such as those at the LHC. Alternatively, if the Higgs boson doesn't exist then we may end up narrowing the upper and lower bounds until they cross each other. In that case the Standard Model will be wrong and we'll have an interesting day.

    1. Re:To be clear what this means. by Dachannien · · Score: 4, Funny

      These are bounds for the mass of the Higgs boson assuming it exists. If it doesn't exist, this data is meaningless.

      Film narrator: Remember, it's up to us. Bigfoot is a crucial part of the ecosystem, if he exists. So let's all help keep Bigfoot possibly alive for future generations to enjoy unless he doesn't exist. The end!

    2. Re:To be clear what this means. by dr_tube · · Score: 4, Informative

      It makes sense. It 'gives' mass to other particles by interacting with them, 'knocking them back' when they start to move (simplified, but that's the basic idea). It also interacts with itself, giving itself mass in the exact same way it gives mass to other particles.

    3. Re:To be clear what this means. by Requiem18th · · Score: 2, Insightful

      Maybe he made an intelligent, informed comment on Apple or some other heinous sin.

      --
      But... the future refused to change.
    4. Re:To be clear what this means. by Hurricane78 · · Score: 2

      that we'll narrow the mass down to a very tiny bound (if it exists) which would be strong evidence for its existence.

      No it wouldn’t. Because that would be like saying: We searched the whole world for Bigfoot, except for this little hut here. So he must be in that hut.

      No he doesn’t. Because you still haven’t proven that he exists at all. :)

      --
      Any sufficiently advanced intelligence is indistinguishable from stupidity.
  4. Re:wasteful by Kjella · · Score: 5, Insightful

    wasteful science at it's worst. trying to detect something we can't see, 99.999% (at least) of the worlds population wouldn't care if it was found and finding it would have zero impact on the worlds population. the world of physics and physicists needs to take a good long hard look at itself... and try and work out what it's going to do when the funding runs out... next year

    I'm sure nobody technically gives a fuck about electromagnetic waves either, until we made radios and wireless and microwaves and cell phones
    I'm sure nobody technically gives a fuck about electrons either, until we made TVs and computer monitors (and electricity itself)
    I'm sure nobody technically gives a fuck about photons either, until we made lasers and optical fibers to be the backbone of the Internet

    They're literally trying to understand what creates mass. If you don't think anything useful or cool can come out of that, you seriously lack imagination. But since you're ACing I assume you're trolling and I just bought it.

    --
    Live today, because you never know what tomorrow brings
  5. Re:wasteful by annex1 · · Score: 2, Funny

    I actually had to read your post 3 times, just to see if I could detect sarcasm. The gene pool called and it would like you to GTFO.

  6. Re:wasteful by Anonymous Coward · · Score: 5, Insightful

    Guess What - Your perfect world doesn't exist. whilst 99% of the population may not care (I disagree with this statistic also, by the way) the discoveries made will be beneficial to the future populations of this planet.

    You may not care about that; however you would not be on the internet, you would not have electric power, you would not have a motor vehicle, you would not have a large market full of goods from around the globe, you would actually have a pretty terrible life if it wasn't for early greek mathematicians Pythagoras, Euclid, Archimedes, to name a (very small) few.

    You owe your current lifestyle to these men; and our future generations will owe their lifestyle to our mathematicians and physists - only if they get the funding they need, ney the funding the DESERVE.

  7. Re:Aw shucks... by JoshuaZ · · Score: 4, Informative

    Note that they didn't find the Higgs boson, just got narrower upper and lower bounds on the rest mass. In any event, even if the Tevatron had found the Higgs boson, that wouldn't make the LHC useless. The LHC is going to be used for many things other than the search for Higgs boson. For example, the LHC will be useful for finding supersymmetric particles. If we are to progress at all beyond the Standard Model, such particles almost certainly need to exist. Even given the minimal supersymmetric model http://en.wikipedia.org/wiki/Minimal_Supersymmetric_Standard_Model, we still get a lot of other particles. Those particles will be much more easily detectable and analyzable with the LHC than with the Tevatron or any other lower energy collider.

  8. Re:wasteful by dissy · · Score: 2, Informative

    and finding it would have zero impact on the worlds population

    Do as you say, troll.

    If you don't think computers are of any impact, then you should give yours away and get off the Internet. Both are technology that exists because of science which as you say is pointless.

    I guess to a troll, that statement pretty much is true. One can be an asshole without the aid of any technology.

  9. The LHC goes to eleven by hackerman · · Score: 3, Funny

    but the tevatron does more at ten

    1. Re:The LHC goes to eleven by julien+dot · · Score: 2, Funny

      For $2,000 I'll build you one that goes to 12.

      --
      Julien C.
    2. Re:The LHC goes to eleven by electrosoccertux · · Score: 3, Insightful

      "why not build two for twice the price?"/crazy scientist cancer guy from "Contact"

  10. Re:Conversion to mass in kg by Interoperable · · Score: 2, Insightful

    I wish summary articles were written so that most people could understand the terms used.

    The trouble is that 10^-27 isn't a tremendously intuitive number. Even being extremely familiar with scientific notation, the magnitude is so small that it really defies any intuitive sense of scale. GeV may not be nearly as familiar as kg but eV (electron volts) are an appropriate unit when dealing with particle energies and so are used in most articles regarding accelerators. Given the choice, I would take eV so that people who are following the progress of the LHC and Tevatron colliders can compare between articles.

    --
    So if this is the future...where's my jet pack?
  11. Re:wasteful by harmonise · · Score: 2, Insightful

    you seriously lack imagination.

    You misspelled "education."

    --
    Cory Doctorow talking about cloud computing makes as much sense as George W Bush talking about electrical engineering.
  12. Re:wasteful by hedwards · · Score: 3, Interesting

    As opposed to wasting trillions of dollars to destabilize the middle east? Yeah, that's a useful expenditure of tax payer dollars. Perhaps next year we can pay to remove all references to electrons from the chemistry text books while we're at it.

    Seriously, the applications for a lot of this stuff doesn't become apparent until after it's been discovered, I'm not sure what people thought they'd be able to do with Maxwell's equations, but I doubt very much that they thought we'd get super colliders and computers out of it.

  13. Re:wasteful by Anonymous Coward · · Score: 5, Funny

    Seriously, what planet are you fucking on? You reckon (laughing to myself) that nobody gave a fuck about electrons until 'we made TVs' ?!?

    He's posting on slashdot. Chances are, he's not fucking on *any* planet.

  14. Re:Aw shucks... by hedwards · · Score: 3, Interesting

    Note, they possibly could still do it, it's not out of the realm of possibility that the higgs boson is going to require more than fermilab can throw at it. Additionally if it turns out that the higgs boson doesn't exist, you're probably going to want the LHC and possibly something bigger to really nail it down. Rather than just eliminate the larger sizes. I don't expect that this sort of research will really settle the question unless there's a positive result and somebody actually discovers it.

  15. Re:Conversion to mass in kg by biryokumaru · · Score: 2, Funny

    Ah, yes, the old imperial to metric conversion. In the states, we still use the old "Library of Congress" standard unit system. I think the LoC to DPb conversion is 3.2x10^7 books / 40 DDs.

    --
    When you're afraid to download music illegally in your own home, then the terrorists have won!
  16. can a Higgs Boson fly Southwest? by YesIAmAScript · · Score: 3, Funny

    Or is it massive enough that it must purchase two seats?

    --
    http://lkml.org/lkml/2005/8/20/95
  17. Re:wasteful by Ambitwistor · · Score: 5, Insightful

    From the Congressional Joint Committee on Atomic Energy, April 17, 1969, regarding the justification for funding the then-unbuilt Fermilab:

    Senator John Pastore: Is there anything connected with the hopes of this accelerator that in any way involves the security of the country?

    Robert Wilson: No sir, I don't believe so.

    Pastore: Nothing at all?

    Wilson: Nothing at all.

    Pastore: It has no value in that respect?

    Wilson: It has only to do with the respect with which we regard one another, the dignity of men, our love of culture. It has to do with: Are we good painters, good sculptors, great poets? I mean all the things we really venerate in our country and are patriotic about. It has nothing to do directly with defending our country except to make it worth defending.

  18. Re:Conversion to mass in kg by ehrichweiss · · Score: 5, Funny

    Stop using these arbitrary units of measure. Just tell me how many station wagons of backup tapes this is..

    --
    0x09F911029D74E35BD84156C5635688C0
  19. Bounds are Complicated by mbone · · Score: 3, Informative

    The new data mandates that the Higgs boson mass within the standard model lies between 115 and 150 GeV."

    No, it doesn't. Look at this graph. At a "3 sigma" level (and don't believe any new science that is not at the 3 sigma level or better), the mass of the Higgs (assuming it exists) is roughly between 115 and 225 GeV. To put it another way, a mass greater than the Tevatron exclusion zone at ~160 GeV is by no means ruled out.

    1. Re:Bounds are Complicated by John+Hasler · · Score: 2, Insightful

      > At a "3 sigma" level (and don't believe any new science that is not at the 3
      > sigma level or better),

      So I guess you reject pretty much all of biochemistry and medicine?

      --
      Warning: this article may contain humor, sarcasm, parody, and perhaps even irony. Read at your own risk.
    2. Re:Bounds are Complicated by JohnFluxx · · Score: 4, Informative

      2 sigma means a 95% certainty, and 3sigma means a 99.7% certainty.

      So at just 2 sigma, 1 in 20 times you will get it wrong/fail. I would hope that in medicine and biochemistry, where it matters, that they do use 3 sigma certainty.

      In particle physics, a 5 or 6 sigma certainty is usually used for confirming a new particle, which means that you're wrong only once in a couple of million times (although guessing at the errors is probably itself the most significant error.

    3. Re:Bounds are Complicated by JamesP · · Score: 2, Informative

      2 sigma means a 95% certainty, and 3sigma means a 99.7% certainty.

      So at just 2 sigma, 1 in 20 times you will get it wrong/fail.

      It doesn't work that way...

      I would hope that in medicine and biochemistry, where it matters, that they do use 3 sigma certainty.

      No, they use usually btw 90/95% (if not lower).

      Also, WHAT, 3sigma is a huge space (especially in this kind of experiment).

      --
      how long until /. fixes commenting on Chrome?
    4. Re:Bounds are Complicated by Rich0 · · Score: 2, Interesting

      So at just 2 sigma, 1 in 20 times you will get it wrong/fail. I would hope that in medicine and biochemistry, where it matters, that they do use 3 sigma certainty.

      I hate to burst your bubble, but in medicine you can't create cancer patients by blasting metals with cathode rays or however you make your particles in your accelerators. You also can store a sample of a quintillion patients in an ion trap. Sample sizes are just a tiny bit smaller in most clinical trials when compared to particle colliders.

      Clinical trials (whether on drugs or other medical techniques) are very rudimentary techniques for determining the effectiveness of treatments, but they're the best we have, and many medical techniques don't even get this level of rigor. Usually their results are only significant at the 95% confidence level, which means that 1 out of every 20 things we "know" in medicine could be completely wrong. Additionally, a significant results often means that there is a barely measurable difference between a treatment and a placebo - the placebo might cure cancer 20% of the time, and the pill might cure it 30% of the time.

      If we just lied to patients and gave them all sugar pills I doubt our standards of health care would drop enough to even be measured, which is pretty sad to think about.

  20. Re:Conversion to mass in kg by mbone · · Score: 4, Funny

    You should consider cosmology. That's the only field I know of where errors at the 10^54 level might be acceptable.

  21. I'm lost. by DJRumpy · · Score: 3, Interesting

    I would imagine this is how my family and friends feel when I start speaking computer gibberish. I'd consider myself relatively competent to understand basic principles like gravity, mass, weight, etc, but can someone dumb this down?

    http://en.wikipedia.org/wiki/Standard_Model

    I know that's probably a hopeless request without some sort of basis in this field, but can someone give the "particle physics for dummies" equivalent here?

    I get the impression this is a hunt for some as yet unknown particle?

    1. Re:I'm lost. by domulys · · Score: 2, Informative

      It so happens that there is a "simple English" version of that wikipedia entry:

      http://simple.wikipedia.org/wiki/Standard_Model

    2. Re:I'm lost. by zmooc · · Score: 5, Informative

      particle physics for dummies

      ALL (anti)matter, ALL forces, fields and waves and everything you can think of consists of particles. I'm not talking about neutrons and protons and the such, but even smaller particles known as subatomic particles or elementary particles. Most of us know the group of particles called quarks, but there are more groups of particle with cool names like leptons (an electron is a lepton) and bosons (a photon is a boson).

      We know that a LOT of nature shows some kind of symmetry; this is the same in elementary particle physics. From this, it has been deduced that several particles not yet detected must exist in order to fill in the gaps in the symmetry. It is those particles we are looking for and they are predicted by the Standard Model, which is an enourmous collection of theories that together attempt to describe our entire universe (with the exception of gravity) (and to unify the newtonian and einsteinian physics).

      Such particles have many hard-to-understand properties like spin, charge, mass etc. What we are looking for, however, is their specific energy. We do this by accelerating matter (protons typically) to incredible speed and then colliding it. In such a collision, enormous energies occur that cause elementary particles to cease to exist and create new elementary particles. All kinds of particles can sort of randomly be created during such a collision, but obviously the collision itself has to be powerful enough to reach at least the energy the particle we're looking for has. So we keep building more and more powerful particle accelerators in order to find these things. What we call the energy of such a particle is a bit complex; it sort of comparable to mass*speed, but that's not all there is to say about this; for example many particles have a fixed speed, namely the speed of light. Therefore, their mass is equivalent to their energy. That's the GeV number we're talking about here. Note that this is incredibly simplified; for example we don't really know the mass of the photon (except that it is 0 in rest, but photons don't exist in rest) but we DO know its' energy since we can measure that. Also, the charge is not factored into this equation. But, in general, elementary particle physicists think in "energy", not in "mass" or "speed".

      Anyway, around the point of collision, enormous detectors have been built that attempt to trap the particles created in the collision. These detectors generate a small electric current comparable to the energy of the particle that collided, which is measured. Think about them as antenna's. After millions and millions of such collisions, patterns start to emerge and we can deduce a specific particle has been created in our collisions. For example, you see a lot of collisions with this energy and a lot with that energy, but none with energy such and so. The result is sort of like a spectrogram (but again, it's way more complex than that).

      So in the case of the Higgs Boson, in this "spectrogram", we're looking for a peak somewhere between 115 and 150 GeV. This is obviously an incredibly simplified explanation, but I think this should make you understand just a bit more.

      --
      0x or or snor perron?!
  22. Re:wasteful by daveime · · Score: 4, Funny

    The banking sector aren't that dissimilar from quantum physicists ... they deal with gigantic magnitudes of imaginary "wealth" that ceases to exists as soon as someone actually scrutinizes the figures and collapses the waveform, causing it all to disappear.

    Still at least we've managed to capture the Madoff Particle.

  23. Re:Conversion to mass in kg by TheEldest · · Score: 4, Informative

    The higgs is sort of the measureable side effect of the physics that 'give' particles mass.

    Think of it this way. The Electro Magnetic field "gives" particles charge. (or the charge in a particle interacts with other charges through the EM field).

    There are some particles that sorta 'show up' in the equations when you're dealing with the EM fields (photon, W & Z bosons).

    The same sort of things happens with mass. Some physicists came up with an addendum to the current equations that would explain how the mass of particles interacts. These equations have in them (depending on version) 1 or more particles (Higgs bosons).

    So it's not so much that the Higgs gives particles mass, but by detecting the Higgs, we prove the existence of the Higgs field which allows mass in particles to interact.

  24. Please stop this "God particle" nonsense by slb · · Score: 2

    I doubt any physicist would refer to the Higgs boson as "God particle" and that's obviously not the case in TFA. So why kdawson is feeding this idiotic meme ?

    Next time we speak about serious science are we going to refer the research subject's as "pixie dust" or "Satan ichor" ?

    --
    http://www.transparency.org
    1. Re:Please stop this "God particle" nonsense by dylan_- · · Score: 4, Informative

      I doubt any physicist would refer to the Higgs boson as "God particle"

      Except that the phrase was coined by Nobel Prize-winning physicist Leon Lederman.

      --
      Igor Presnyakov stole my hat
  25. Re:Conversion to mass in kg by somersault · · Score: 2, Funny

    Actually, one Dolly Parton's bosom (DDb) just happens to be exactly the same mass as that of a Double Decker Bus (DDB). Confusing, but convenient!

    --
    which is totally what she said
  26. Re:wasteful by Jedi+Alec · · Score: 3, Funny

    The banking sector aren't that dissimilar from quantum physicists ... they deal with gigantic magnitudes of imaginary "wealth" that ceases to exists as soon as someone actually scrutinizes the figures and collapses the waveform, causing it all to disappear.

    Still at least we've managed to capture the Madoff Particle.

    Yay, thanks for that. Now I'm scared to check my bank account balance. So long as I don't look, the money might still be there...

    Schrodinger's Savings and Loans anyone?

    --

    People replying to my sig annoy me. That's why I change it all the time.
  27. The "particles" word is unfortunate by Kupfernigk · · Score: 3, Interesting
    Physicists have adopted the word "particles" to mean all kinds of different things, and I think this is a lot of the problem. It made sense when electrons, protons and neutrons first were discovered, because they had a relatively familiar kind of pointlike behavior even though this was not really correct. I have a nuclear physics textbook from the 1930s, and it is really interesting to see the state of confusion they were in at the time. (Memo to global warming denialists: there was also a lot of discussion about whether this stuff was or was not "real" and whether the experiments meant anything. This came to a sudden stop around mid-1945, for some obscure reason. However, I digress.)

    Most people use the word "particle" to mean a small solid object, and I think it is fair to say that quarks, gluons, and the Higgs can't meaningfully be categorised in this way. It is not surprising that early mathematical physicists often emphasised concentrating on the wave equations and not trying to assign physical meanings.

    --
    From scarped cliff or quarried stone she cries "A thousand types are gone, I care for nothing, no not one."
  28. Re:A couple of errors here... by zmooc · · Score: 2, Interesting

    Apart from that you're completely right, I couldn't resist the urge to come up with some far-fetched counterarguments:Pp

    1) That's not quite true. It is perfectly possible to cool something with "superhot" laser beams; no need to have something even cooler. Therefore, reaching absolute zero is not impossible by that definition. It is only the law of entropy that prevents us from reaching absolute zero. Or so it says.

    2) Since we're reached the purely theoretical/philosophical discussion... zero-point energy only changes with time. So if you'd be able to stop time, it would be possible to stop all molecular motion (which also follows from the definition of motion and time anyway;)). But then again, without time, one cannot observe. We would not even notice if time stopped, maybe it just paused for quite some "time" ;-PPp

    3) I believe (but am not sure) we merely don't know how to stop or slow photons (in a vacuum, that is). No known force can do it nor does there appear to be a gap in our knowledge in which such a force might eventually be found. So it is very likely that it is impossible indeed, but as far as I'm aware there's no proof of that.

    Never say never;-)

    --
    0x or or snor perron?!