-
Looking for HSC notes and resources? Check out our Notes & Resources page
Standard Model of Atom? (1 Viewer)
- Thread starter garry
- Start date
Xayma
Lacking creativity
- Joined
- Sep 6, 2003
- Messages
- 5,953
- Gender
- Undisclosed
- HSC
- N/A
The standard model of the atom is the model that contains the Quarks, Leptons and Force Carriers.
Leptons include the neutrinos, and electrons (and the corresponding II and III generation particles).
Leptons are thought to be fundamental particles.
Hadrons, (those that experience the strong nuclear force) consist of quarks.
Baryon's are those with 3 quark combinations. They include the Proton (Up, Up, Down quarks) and Neutron (Up, Down, Down) with the quarks having a charge of +2/3 of an electron and -1/3 of an electron.
Quarks are the reason for the strong nuclear force due to them possesing a colour charge (dont really need to know of colour though). Quarks are thought to be fundamental particles.
Both Baryons and Leptons have 1/2 integer spins and obey Pauli's Exclusion principle.
Bosons (Force Carriers) have integer spins and do not obey Pauli's Exclusion Principle. They include photons, for the electroweak force, and gluons for the strong nuclear force.
Leptons include the neutrinos, and electrons (and the corresponding II and III generation particles).
Leptons are thought to be fundamental particles.
Hadrons, (those that experience the strong nuclear force) consist of quarks.
Baryon's are those with 3 quark combinations. They include the Proton (Up, Up, Down quarks) and Neutron (Up, Down, Down) with the quarks having a charge of +2/3 of an electron and -1/3 of an electron.
Quarks are the reason for the strong nuclear force due to them possesing a colour charge (dont really need to know of colour though). Quarks are thought to be fundamental particles.
Both Baryons and Leptons have 1/2 integer spins and obey Pauli's Exclusion principle.
Bosons (Force Carriers) have integer spins and do not obey Pauli's Exclusion Principle. They include photons, for the electroweak force, and gluons for the strong nuclear force.
Don't edit you cheatTommy_Lamp said:
Last edited:
Tommy_Lamp
Coco
yeah the quark one
Tommy_Lamp
Coco
I drew up a flowchart that shows the basic idea behind the Standard Model.
Ive put it in the resources section but it wont be up for a while, so ill post it here aswell
Ive put it in the resources section but it wont be up for a while, so ill post it here aswell
Tommy_Lamp
Coco
really?!
according to my text book they are,
according to my text book they are,
Tommy_Lamp
Coco
yeah well nerXayma said:Quite simply.... Your textbook is wrong
whatever we need to know is correct on that sheet
thaoroxy2001
Bored member
Hold on!! a Meson is a Hadron but a Hadron is a Fermion...doesn't that make Mesons a Fermion?
Even my teacher says that a meson is a fermion!! Someone plz sort this out for me coz I'm really lost now!!!
Even my teacher says that a meson is a fermion!! Someone plz sort this out for me coz I'm really lost now!!!
Xayma
Lacking creativity
- Joined
- Sep 6, 2003
- Messages
- 5,953
- Gender
- Undisclosed
- HSC
- N/A
Ok thats were the is an error with Tommy's chart.
Lets go through some simple definitions (no use drawing a chart because lines would go everywhere).
Hadron - A particle that experiences the strong nuclear force, they are composed of quarks and antiquarks. They can be further devided into mesons and Baryons
Quark - Thought to be a fundamental unit, they pair up in multiples (3 for protons, neutrons a quark and anti quark for mesons, [4 quarks 1 antiquark for pentaquarks etc outside syllabus]). They have charges of +2/3 and -1/3 that of an electron.
Lepton - Thought to be a fundamental unit, comprise electron's neutrinos and there IInd and IIIrd generation particles.
Fermion - Particles with an odd half-integer spin (eg 1/2, -1/2, 3/2) fermions include Baryons (3 quark combinations) and Leptons. All fermions obey Pauli's Exclusion Principle.
Boson - Particles with a 0 or integer spin. Bosons follow Bose-Einstein Statistics and DO NOT obey Pauli's Exclusion principle. They can be force carriers and include gluons, photons, mesons and some atoms (eg He-4)
Lets go through some simple definitions (no use drawing a chart because lines would go everywhere).
Hadron - A particle that experiences the strong nuclear force, they are composed of quarks and antiquarks. They can be further devided into mesons and Baryons
Quark - Thought to be a fundamental unit, they pair up in multiples (3 for protons, neutrons a quark and anti quark for mesons, [4 quarks 1 antiquark for pentaquarks etc outside syllabus]). They have charges of +2/3 and -1/3 that of an electron.
Lepton - Thought to be a fundamental unit, comprise electron's neutrinos and there IInd and IIIrd generation particles.
Fermion - Particles with an odd half-integer spin (eg 1/2, -1/2, 3/2) fermions include Baryons (3 quark combinations) and Leptons. All fermions obey Pauli's Exclusion Principle.
Boson - Particles with a 0 or integer spin. Bosons follow Bose-Einstein Statistics and DO NOT obey Pauli's Exclusion principle. They can be force carriers and include gluons, photons, mesons and some atoms (eg He-4)
Constip8edSkunk
Joga Bonito
think about it this way, mesons contain 2 quarks, and each quark has a half spin, therefore mesons cannot have a half spin (only zero or integer spin ispossible), therefor they are bosons
:: ck ::
Actuarial Boy
- Joined
- Jan 1, 2003
- Messages
- 2,414
- Gender
- Male
- HSC
- 2004
second and third gen contain more complex quarks not experienced in the "everyday" world .. if u kno wot i mean - eg : particle accelerators
these are unstable and decay into first generation quarks (up and down)
each generation is more massive than the previous generation
these are unstable and decay into first generation quarks (up and down)
each generation is more massive than the previous generation
Jase
Member
e.g -
Gen I -> Electron-Neutrino ; Up down
GenII -> Muon-Neutrino ; Charm Strange
GenIII -> Tau-Neutrino ; Bottom Top
as well as each repespective antipairing.
Mesons are really interactive bosons, so its also a hadron with integer spin right? so the chart is half right. which means, mesons can be both fermion and boson.. which isnt really surprising considering the nature of quanta in the first place.. i guess?
Wait. cant we say, mesons are *composed* of fermions but are bosons by nature of spin. like a composite particle.
its hard to flowchart the standard model since they all kinda overlap.
Hadrons are composed of fermions and gluons(which are bosons).
damnit now im confused
Gen I -> Electron-Neutrino ; Up down
GenII -> Muon-Neutrino ; Charm Strange
GenIII -> Tau-Neutrino ; Bottom Top
as well as each repespective antipairing.
Mesons are really interactive bosons, so its also a hadron with integer spin right? so the chart is half right. which means, mesons can be both fermion and boson.. which isnt really surprising considering the nature of quanta in the first place.. i guess?
Wait. cant we say, mesons are *composed* of fermions but are bosons by nature of spin. like a composite particle.
its hard to flowchart the standard model since they all kinda overlap.
Hadrons are composed of fermions and gluons(which are bosons).
damnit now im confused
Xayma
Lacking creativity
- Joined
- Sep 6, 2003
- Messages
- 5,953
- Gender
- Undisclosed
- HSC
- N/A
I suppose they are composed of fermions, but I wouldn't say that since quarks can't exist by themselves. But basically yes, they are composed the of fermions the same way that He-4 atom is.
It is alot easier to not refer to them as fermions and just as quarks, since leptons are also fermions.
Basically:
Bosons (Integer spins):
Mesons, Force carriers (photons/gluons), any atom where the sum of the spins is 0 such as He-4.
Hadron (quark composed particle):
Mesons, Baryons etc.
Lepton (Fundamental Particles):
Electrons, neutrinos.
Baryon (n/2 integer spins, were n is odd, Hadrons):
Protons, Neutrons
Fermions (n/2 integer spins, where n is odd, obey Pauli's Exclusion principle):
Baryons, Leptons.
It is alot easier to not refer to them as fermions and just as quarks, since leptons are also fermions.
Basically:
Bosons (Integer spins):
Mesons, Force carriers (photons/gluons), any atom where the sum of the spins is 0 such as He-4.
Hadron (quark composed particle):
Mesons, Baryons etc.
Lepton (Fundamental Particles):
Electrons, neutrinos.
Baryon (n/2 integer spins, were n is odd, Hadrons):
Protons, Neutrons
Fermions (n/2 integer spins, where n is odd, obey Pauli's Exclusion principle):
Baryons, Leptons.
Last edited:
thaoroxy2001
Bored member
Do we need to know about the 2nd and 3rd generations or the limitations of the model coz my teacher hasn't even mentioned that! Well...I'm stuffed aren't I?
Jase
Member
not particularly. If you know all about the 'normal' generation particles, that should keep everyone happy. I guess you could just briefly mention the existence of such generations.. but its not entirely neccesary.
Likewise, i dont think its too important to discuss limitations. The only thing i can think of is the absence of the gravity particle.. and mabye Uncertainty?.. and all of life's greatest mysteries.
Likewise, i dont think its too important to discuss limitations. The only thing i can think of is the absence of the gravity particle.. and mabye Uncertainty?.. and all of life's greatest mysteries.
The Bograt
boredofuni
What kind of questions can they ask on this? Cause I am so bloody confused you have no idea...