s9 - WWW“"T” WWW M 1 W 7 i 7 A 2 3 i J WW WW i...

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Unformatted text preview: . WWW“ "T” WWW M 1 W. 7 i 7 A 2 3 § i J : . WW WW i i , . . > , ; ; -, . WWWWWW .w WWWWW WWWW .. .W ”WWW .. 1W. .. W .. 1 ,W WWW W. WW W WWW . W. WW ;. WW- WWW; W. 3.1 Strange particles like the A“ baryon and the K mesons are usually produced 1n reactiens that ._ conserve strangeness. %(a)p+p—+A°+K++p b)p+p«»K++K“+p+p , . M .7 V , ,.§.§_.,3;...§.Mr33¥ , . ., ‘ , . _ a , .. , , . A, . , . > ,_ y: L. It? 3333.4..rséif325 , _ q M , E: H3§L3|i+z§; . . aitmisLEs 40 if??? > ,3 \ ‘ 3. , _ . L , ,3 .r. w m :Tx.;§.§.§+i?:T3,?+33%,Te3x. m w 3 . W h . + , . _ w ..T:E.,._,T§L;3:233: : g, 5 ,. _ .5237323 CW 3: !s?T:§ 3.53::+§§L§s m 51.3.3 .3», :19 {IL erI‘Jr: )3. e 53:22 LE; M MSW 5.2%,“?sz » W __ , M __ a ,W _. ,N EEIWSEi+i§s4Exiwtz? M , ‘ : .33: 72%. L.i,u!.._§ 317;; 52.3 A 3%“..‘fwm as? r3339 ,3 ‘Mw‘fflfl : V! 3» :73!!! _ _, , 3.5435- W 3,. _ m 3:33. a; S M xiii :3 1a, : 53:3; 2.: ,V y! . W M < 32+35 ‘ » é .. , V . . . :6;33.L2$}3L:§3.1311!, a, 533,? 553.:Hzizrizré335 . 3 _, l 3 3 3 i _ » . ; 3 g 3 2 During the 1960’s and 1970’s a lot of work was done studyxfig excited states of mesons. These 4-14, 4 ~ are mesons such as the K * mesons, which have the same quark content as the spin-zero ”stable K ’ ; 3 mesons but have larger spin values due to the alignment of the quark spins and/or orbital angular ‘ momentum of the quarks with respect to each other. 3 _ 3 To measure the K * masses, one used a missing-mass spectmmeter. A K beam of known momentum ‘ M L w— ~— was fired at a proton target (eg liquid hydrogen) and a spectrometer measured the outgoing proton % 3 from the reaction: 3K+p——>K*+p -444... .L 3 3;_ Show that there 13 enough information to calculate the mass of the K ‘ and derive an expression for’ L 3 g it using the known and measured quantities. Use four—vectors 1n your derivation , 3.1:.-- 3». 4-. .4444 _,., i 1- .3.414.L44.. 4-4-.4..._4.3144.443_4.44 L —- ., ’ 3.33mi..- “Lo-Mic Less. l .: l 1' i W44, ..1; $3 ,,_,._' . W W . . _ .Eqalaq .i .3...» :y?«L§.f§§ 1.5%.} W i 5.295” M W M W W M Q it}, Ess..ifr1$.-§a , ,Esra;VgLsgé,_ L: 3;... , . w ,. . w , : . . , . . $4 w a». 1: _. E 1.6 W ,w w fl??? , w . \Sstapwivtfaw sgLiil 1,695.! xiii: ‘heavy electron’. As such, it can take the plane of an electron in an isoftencalleda 3. The muon W SET: éL,3§.,,.Ni§ ,, _ . ., a . .,. a ,. . .. . .. ; , s .. . . . . .. _ .. . . ,N . s . iaiitiy!w,.s_s}.+.§sis. _ a w w H .! H. x a. .45 5” :3); t . N M W w . w, . W . V . . .Vi: t2 . 3- L (373 r i , Z (i y W m _ u , H . . _ M m (at. :v; (its . u, . .f) .Cfiei. :m .i v :Liiexiiiéz _, _ . , A . _ ‘ Vim +§;Yt: s- . « M .. _ , . , _ . _ , w w _. w . .éimIJEErxiwflzw .7 xtstég. ._xlf,....:i§rHT§3! .325. 331...: ii..._i:xx._..r;i.? 1‘!!! 2 _ are closer to the nucleus. Calculate .§?§:.,.r....§ W m . .9 fl W N ,. orbits the wavelength of the Ha line for a muonic atom 00111ng a proton and a ,u‘. The mass of the muon is 105.7 Meal/c2 and the proton mass is 938.3 MeV/cz. i _, 3 Due to its larger mass, ’ c atom r atom to make a ‘nmo « _ V , N W. . . .V . w W _ a . V“ w _ i ...
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