Particle Physics

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CLICK-BAIT HEADLINE!  “LIKE” AND SHARE!  NUMBER 51 WILL AMAZE YOU*!!

It’s Wednesday, and I cannot summon the will to write on The Dark Fairy and the Desperado, so I’ll do a bit of writing here as I discussed yesterday.  I’m not sure what the topic will be.  I did at least come up with a headline that amuses me, though I doubt anyone else will find it funny.  Still, you can’t rely on anyone else to amuse you—they’re much more often infuriating—so you might as well amuse yourself.

There’s no dearth of potential topics out there in the wide world, from the war in Ukraine, to the January 6th hearings, to recent Supreme Court rulings, and of course, “mass” shootings**.  The latter, though certainly serious and important, still constitute a mere rounding error in the overall gun deaths in the United States, the majority of which are still suicides, as I understand it.

All of which nevertheless makes clear that, whatever your take on gun control/gun rights, there’s little doubt that we have a mental health problem in the USA (anyone reading my writing can surely testify to that fact).  In some ways it’s merely part and parcel of our overall healthcare issues, but I suspect that there are aspects that are orthogonal to, and in addition to, all the various other issues we have with our healthcare system.  I’m not part of that system anymore.  I don’t have insurance, nor do I go to any doctor, though I am one myself (no longer in practice).  My own health is one of the things about which I am least enthusiastic—which is really saying something.

Of course, in six days (if all goes as scheduled) the James Webb Space Telescope will release to the public the first of its scientific data so far.  Actually, the telescope itself won’t be releasing the information.  Though it could be considered a robot, it’s not that kind of robot.  NASA and/or the various agencies and institutions involved in the research being done will be the ones releasing the info.

Isn’t that just typical?  The JWST does all the work, but various groups of humans take all the credit.  Humans!  Ptooey***!

As for me and my house…well, I don’t actually own a house, though I live in one, but its state is up in the air right now (figuratively speaking).  I’m being moved into a different room in it so the owner can then rent out the remainder of the house to people as yet unknown.  Meanwhile, my former housemate is doing repairs and upgrades and whatnot, cleaning up after the people who were there before (who were nice, but were messy as well as unreliable, still not having paid for their last 2 months of utilities yet—I covered all that myself).  He’s been using this new sports energy drink powder that’s making him a little too wired, and he was doing odd repairs at about eleven last night, right outside my room.  It woke me up, and I was rather cross; I don’t like surprises much.

Anyway, I’m apathetic and stressed out, all at once.  I’m also still at least a bit ill****.  It’s all terribly interesting and exciting…but only in the sense of the curse, “May you live in interesting and exciting times”.

I’m working on editing a video project or two, which I expect I’ll mention a bit more tomorrow, during my usual weekly blog post.  That editing process reasserts the reality of my appearance upon me, and I really doubt I will do any more such videos in the future.

I honestly still don’t know what, if anything, I will do beyond the immediate future.  I have no plans of significance, and I have no real hopes.  At least, there’s nothing to which I’m looking forward.  No, not even the JWST results, nor even the findings from the latest startup of the Large Hadron Collider, which surely won’t give anything that can be coherently shared with the public for months.  At least we can reassure anyone who still fears the LHC might produce some dangerous phenomenon that will obliterate the planet, by pointing out that cosmic rays of similar character to LHC collisions but vastly greater power—I mean there’s really no comparison—strike the upper atmosphere of the Earth countless times every day and have done so for as long as the Earth has existed.  Fortunately (or unfortunately), none of them has wiped out the planet.  That’s a tremendous number of missed opportunities on the part of nature, if nature actually did want to destroy us*****.  So, there’s no reason to worry about the LHC.  Looking through a magnifying glass at something interesting in the grass is, honestly, more likely to do damage; if it’s a sunny day, you might accidentally focus sunlight and burn an insect or start a fire.

So, please be careful, anyone who still has the childlike sense of curiosity that might make you go out in the field and look at things under a magnifying glass.  First, do no harm.

*Because even though it looks like it ought to be prime, it isn’t; it’s divisible by 17 three times.  53, however, is prime.  57 is not.  59 is.

**Defined in physics as shootings that interact with the Higgs field, and so cannot ever travel at the speed of light.

***I doubt the JWST really cares—it was never designed to have such mental states, even if humans knew how to design and create such states yet, which humans don’t.

****Physically, I mean.  There’s little doubt that I am, have been, and probably will be mentally ill until the day I die.

*****Clearly it doesn’t, because if the universe, or nature, did want to kill us, we would be dead, instantly.  There are innumerable ways the universe could obliterate all traces of life on Earth if there were some actively hostile will behind it.  We living things are, after all, extremely tiny and insignificant on any scale but that of our own minds.

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So What Is All This GeV Stuff, Anyway?

[This is a reprint of an article I wrote for my hubpage…but I want to focus here on my own page, now, so hopefully no one will be too upset by the re-use.]

Recent news about events at the Large Hadron Collider in Switzerland has brought particle physics more into the mainstream, as scientists have discussed hints that they’re getting closer to finding and defining the Higgs particle…the messenger particle of the Higgs field.

I’m not going to try to rehash the meaning and nature of the Higgs field here. Most of the articles I’ve looked at do at least a decent job with that subject. If you want an even better treatment–as well as a fantastic summary of the state of modern physics that is thorough but extremely understandable–I recommend getting a copy of “The Fabric of the Cosmos” by Brian Greene. He does a better job of explaining difficult subjects in easy-to-understand terms (that nevertheless don’t dumb down the material) than just about anyone else I’ve ever read.

No, what I’m going to talk about is a term that’s thrown around an awful lot in articles about particles: The GeV (and more generally, the eV). The term eV is shorthand for “electron volt,” and “GeV” is the notation for “giga-electron volt”…a billion electron volts, in other words (MeV, mega-electron volt would be a million electron volts).

But wait…the articles about the Higgs (and other writings about atom smashers) refer to measures such as 125GeV as being a measure of a particle’s mass! What does that have to do with volts!? Don’t volts have something to do with electricity? Isn’t household current measured in volts? Does that mean that it takes a Billion times as much voltage as in household current to find a Higgs particle?

Well…not exactly. In physics, the electron-volt is actually a measure of energy, not the voltage in a circuit. Specifically, it’s the amount of kinetic energy (the energy of motion) a free electron would accumulate after being accelerated through a potential difference of one volt. You see, voltage is to electrical fields a lot like what pressure is to water. Voltage differences push things that respond to electric fields…and electrons are one of the most well-known of things that respond to electrical fields, and have been since at least Benjamin Franklin’s time. In other words, falling through a “pressure” difference of one volt will accelerate an electron until it has a kinetic energy that is defined as one electron-volt.

So what the heck does the kinetic energy of an electron have to do with the mass of a Higgs particle? Well, as you probably know, energy can change its form, but it doesn’t disappear, and if need be can always be measured in the same units. At every day energy levels, physicists are more likely to use joules as a measure of energy…a joule is the amount of energy put out by something that has one watt of power in one second. So a one hundred watt bulb puts out 100 joules of energy every second.

Now, when you’re dealing with smaller scale things–like electrons and protons and Higgs particles (Oh my!)–it’s better to use a smaller unit of measure. The eV is a VERY small amount of energy, and can be excellent currency when describing what goes on in interactions between subatomic particles. Just as you wouldn’t use a brick of gold to try to buy a gumball out of the grocery store gum machine, but would instead use your pocket change, you don’t usually use joules in particle physics. You COULD, of course…but you’d be using REALLY small fractions of joules and it’s just easier to use the particle physics version of pocket-change, the electron-volt.

But still, what does this have to do with the mass of a particle? I’ve been talking about energy here!

Well, now we come to probably the most famous equation in all of physics, at least as far as the general public is concerned: E=mc2 (the two here means “squared”, or a number multiplied by itself). This equation explains that matter and energy are interchangeable. Matter and energy are just two forms of the same thing. So you can describe how much Stuff something is made of by describing it in ordinary terms of Mass (such as grams and kilograms), or, if you’re feeling like it and if it’s useful, you can describe it in terms of energy. Now, the “c” in that famous equation is the speed of light, which is mighty fast: about 300,000 kilometers a second (about 186,000 miles per second). It’s already a big number, but when you multiply it by itself, it’s MUCH BIGGER. So even a little mass converts into an awful lot of energy. That’s why nuclear reactions are so powerful: they convert a fraction of a percent of the matter involved in the reaction into energy, and you get all the glory of our sun and all the horror of nuclear weapons.

So finally we arrive at the reason for using eV’s and MeV’s and GeV’s in particle physics. It turns out that, like joules, working with ordinary mass units like grams gets very cumbersome when talking about really tiny things like subatomic particles. You have to use extremely small numbers with a lot of zeroes after the decimal point. If you’d rather not deal with all those zeroes, well, since matter and energy are interchangeable, you can instead describe very small masses in terms of a pretty fair number of a similarly small unit of energy. An electron-volt is just such a useful small unit.

In other words, when they say that the Higgs particle doesn’t look like it can be more than 125 GeV in mass, they mean that, if you took its mass and turned it into free energy, the amount of energy you’d get would not be more than 125 billion electron volts. That may sound like a lot, and on the scale of subatomic particles, it IS. However, it really is a very small amount of energy, and thus an exquisitely small amount of matter.

Of course, the Higgs fields is thought to permeate literally the ENTIRE universe, and the Higgs fields effects are all carried out by Higgs particles, so the mass equivalent of the field would add up to a pretty big amount in total. In fact, ALL the ordinary things with which we are familiar are made up of particles whose masses can be described in terms of electron volts, and most of those “weigh” a lot less than the Higgs appears to. So big things are made up of small things, just lots and lots of them. Like, lots and lots of electron volts of energy can equal the mass of one small but very important particle.