Class 13, 1/19/03,

* 3:11-3:51pm, Quiz 2
* 3:55-4:25pm,
    ** Handed out HW7;
    ** Started new material: Specifics are added to web page C0 (toward the end, marked "Updates after Quiz 2)
        TB1, S4, Building Block of the Universe
        TB2, Chapter 9, Experimental Signatures; Chapter 10: Quantum Geometry.
N1: Some highlights and history of quantum mechanics. See 10C-6 web page. (More details will be elaborated in future classes.)
N2: Three intrinsic quantities of particles (matter)
        ** Rest mass
        ** Spin (which is as intrinsic as rest mass and scientists do not know why it is there; Spin is not orbital nor rotational angular momentum.)
        ** Electric charge
N3: Particles can be classified by the spin they have.
        ** Bosons: particles having integre spins;
        ** Fermions: particles having half-integer spins.
N4: Showed and discussed Table S4.2: The four forces and their force particles;
N5: Showed the block of matter, quarks and leptons, and force particles of strong and electroweak; The constituents of the standard model.
N6: Showed the web links to three particle physics labs, and their educational web page;
        ** Students are encouraged to view those web pages. Bonus points will be given to those who found good ones suitable for class demo.

Recap:
* Three intrinsic quantities of particles (matter)
        ** Rest mass
        ** Spin (which is as intrinsic as rest mass and scientists do not know why it is there; Spin is not orbital nor rotational angular momentum.)
        ** Electric charge
* Particles can be classified by the spin they have.
        ** Bosons: particles having integre spins;
        ** Fermions: particles having half-integer spins.
* Force particles are all Bosons
    ** phonton, force particle for electromagnetism: rest mass = 0, spin = 1, charge = 0.
    ** weak interaction force particals (The symbol M_p denotes proton rest mass)
            W^+ : mass ~ 100 M_p, spin = 1 h-bar, charge = +1 Q_p;
            W^- : mass ~ 100 M_p,  spin = 1 h-bar, charge = -1 Q_p;
             Z^0 : mass ~ 100 M_p,  spin = 1 h-bar, charge = 0.
    ** strong interaction force particle (indirectly observed)
            Gluon, g _st:  mass?  spin = 1 h-bar, charge = 0;
                (The question mark for gluon mass is to indicate the fact that gluons do not get out of proton or neutron to be free, therefore, its mass is not understandable in the usually sense, yet. This is an opinion of Chau, which may not be shared by all.)
    ** gravitational force particle (yet to be observed)
            Graviton, g_Gr:  mass=0,  spin = 2 h_bar, charge = 0; 
     
***** Below posted before the class *******************

Preview


3:10-3:50pm:  Quiz 2, the procedure and protocol will be the same as Quiz 1. For policy matter, please see Syllabus.

3:55-4:30pm
* We will start
TB1, S4, Building Block of the Universe
TB2, Chapter 9, Experimental Signatures; Chapter 10: Quantum Geometry.
* Hand out HW7.

Sign-up, Class 13
(1) Quiz 2 paper #
(2) Initial
(3) Hand in and check.