|
|
|
|
|
|
|
|
|
 Posted: Fri Jul 01, 2005 8:54 am
A place for all you physics people to hang out and chat together smile
|
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
Posted: Sun Jul 03, 2005 5:09 pm
Is there an equivalent of strangeness in weak forces for strong forces?
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Posted: Sun Jul 03, 2005 5:55 pm
Zombie Eel Is there an equivalent of strangeness in weak forces for strong forces? Sorry, I don't understand the question... I also don't know all that much about physics... sweatdrop
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Posted: Sun Jul 03, 2005 6:49 pm
Chemical_Kitten Zombie Eel Is there an equivalent of strangeness in weak forces for strong forces? Sorry, I don't understand the question... I also don't know all that much about physics... sweatdrop Heh... it's quantum theory. I'm talking about parity matrices.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Posted: Sun Jul 03, 2005 7:59 pm
Well, technically quarks can be affected by the weak force too, and they kinda define strangeness/charm/bottomness/topness. Strangeness is similar to charge, spin, isospin and hypercharge. All are quantities that are conserved under certain conditions by certain particles. For leptons(weak force), this would be charge, as when an electron is created (charge -1), an antielectron must also be created (charge +1). For neutrinos, now that I've looked more into it, conserve lepton number. An electron neutrino has lepton number L = +1 and an electron antineutrino has lepton number L = -1, though this is restricted to families (electron lepton number, etc) and can be violated. The weird thing with neutrinos is that they don't have a flavor (family lepton number, etc) until they interact with another particle - for example, if we shoot two neutrinos at each other, we don't know if they're neutrinos or antineutrinos until we see whether or not they annhilate.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Posted: Sun Jul 03, 2005 9:00 pm
NeoYuuichi-san Well, technically quarks can be affected by the weak force too, and they kinda define strangeness/charm/bottomness/topness. Strangeness is similar to charge, spin, isospin and hypercharge. All are quantities that are conserved under certain conditions by certain particles. For leptons(weak force), this would be charge, as when an electron is created (charge -1), an antielectron must also be created (charge +1). For neutrinos, now that I've looked more into it, conserve lepton number. An electron neutrino has lepton number L = +1 and an electron antineutrino has lepton number L = -1, though this is restricted to families (electron lepton number, etc) and can be violated. The weird thing with neutrinos is that they don't have a flavor (family lepton number, etc) until they interact with another particle - for example, if we shoot two neutrinos at each other, we don't know if they're neutrinos or antineutrinos until we see whether or not they annhilate. Wait, in what situation does weak force affect quarks? I mean, leptons aren't strong force. Isospin, I believe, pertains more to weak forces. However, you do have a point with hypercharge. They beauty and truth of quarks seems to answer my question, because they are constituent of gluons. However, these are only parts of the flavor change in Baryons. Flavors still include strangeness...
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Posted: Sun Jul 03, 2005 11:24 pm
Zombie Eel Wait, in what situation does weak force affect quarks? I mean, leptons aren't strong force. Isospin, I believe, pertains more to weak forces. However, you do have a point with hypercharge. They beauty and truth of quarks seems to answer my question, because they are constituent of gluons. However, these are only parts of the flavor change in Baryons. Flavors still include strangeness... Weak interactions are what change flavor of quarks; a quark can spit out a W- particle and jump flavor. Beta decay and formation of deuterium are two major processes that involve this. Woah, woah, careful again. Gluons don't have flavor; they're bosons, and boson number isn't a flavor. Quarks aren't made up of gluons, they spit them back and forth to exert the strong force. Strangeness, isospin and hypercharge are all strong force (isospin is not invariant for other forces) flavors. Lepton number and weak isospin are flavors for weak force interactions
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Posted: Mon Jul 04, 2005 4:33 am
I had a lovely chart of the different conservation things and what force they did and didn't work for. *sigh*
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Posted: Mon Jul 04, 2005 10:03 am
NeoYuuichi-san Zombie Eel Wait, in what situation does weak force affect quarks? I mean, leptons aren't strong force. Isospin, I believe, pertains more to weak forces. However, you do have a point with hypercharge. They beauty and truth of quarks seems to answer my question, because they are constituent of gluons. However, these are only parts of the flavor change in Baryons. Flavors still include strangeness... Weak interactions are what change flavor of quarks; a quark can spit out a W- particle and jump flavor. Beta decay and formation of deuterium are two major processes that involve this. Woah, woah, careful again. Gluons don't have flavor; they're bosons, and boson number isn't a flavor. Quarks aren't made up of gluons, they spit them back and forth to exert the strong force. Strangeness, isospin and hypercharge are all strong force (isospin is not invariant for other forces) flavors. Lepton number and weak isospin are flavors for weak force interactions Interesting though, because I was lead to believe that strangeness is a component of hypercharge.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Posted: Mon Jul 04, 2005 10:01 pm
Zombie Eel Interesting though, because I was lead to believe that strangeness is a component of hypercharge. I think we're walking around each other here. Strangeness is indeed a component of hypercharge, as are several other flavors, but they are considered separate flavors. There is a weak hypercharge for the weak force, but its the sum of electrical charge and weak isospin and not especially important for this discussion. Here's the list of all flavor quantum numbers: lepton number, baryon number, electric charge, weak hypercharge, weak isospin, isospin, hypercharge, strangeness, charm, topness, and bottomness.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Posted: Tue Jul 05, 2005 8:47 am
NeoYuuichi-san Zombie Eel Interesting though, because I was lead to believe that strangeness is a component of hypercharge. I think we're walking around each other here. Strangeness is indeed a component of hypercharge, as are several other flavors, but they are considered separate flavors. There is a weak hypercharge for the weak force, but its the sum of electrical charge and weak isospin and not especially important for this discussion. Here's the list of all flavor quantum numbers: lepton number, baryon number, electric charge, weak hypercharge, weak isospin, isospin, hypercharge, strangeness, charm, topness, and bottomness. Topness = Truth and bottomness = beauty right? Oh well... not much else to discuss in this matter. I need to take some sort of a course on this stuff.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Posted: Tue Jul 05, 2005 9:03 am
Zombie Eel Topness = Truth and bottomness = beauty right? Yep. There's that old top/bottom vs truth/beauty thing. Hehe, particle phys classes are fun, but they can be fairly hard. ^_^
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Posted: Tue Jul 05, 2005 12:29 pm
NeoYuuichi-san Zombie Eel Topness = Truth and bottomness = beauty right? Yep. There's that old top/bottom vs truth/beauty thing. Hehe, particle phys classes are fun, but they can be fairly hard. ^_^ Yeah. Well, it's what I hope to deal with though, as I hope to double-major in physics and math. I'll be starting my freshman year this fall, but I'll be taking a course in Quantum/astro physics for a month beforehand (which starts next week). Good discussion, though.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Posted: Tue Jul 05, 2005 2:29 pm
NeoYuuichi-san Zombie Eel Topness = Truth and bottomness = beauty right? Yep. There's that old top/bottom vs truth/beauty thing. Hehe, particle phys classes are fun, but they can be fairly hard. ^_^ Aye, particle physics is "hard" compared with other fields... you need a background relativistic quantum mechanics (meaning you need to know SR and normal QM beforehand) to begin it 'properly'.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Posted: Mon Jul 18, 2005 9:11 am
Wow...I like physics but this is like "blah, blah blah blah blah quarks blah blah blah." I really need to at least be a sophmore in high school before I'll understand any of this sweatdrop
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Reply
