rpp2010-rev-naming-scheme-hadrons

rpp2010-rev-naming-scheme-hadrons - 8. Naming scheme for...

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8. Naming scheme for hadrons 1 8. NAMING SCHEME FOR HADRONS Revised 2004 by M. Roos (University of Finland) and C.G. Wohl (LBNL). 8.1. Introduction We introduced in the 1986 edition [1] a new naming scheme for the hadrons. Changes from older terminology a±ected mainly the heavier mesons made of the light ( u, d, and s ) quarks. Old and new names were listed alongside until 1994. Names also change from edition to edition because some characteristic like mass or spin changes. The Summary Tables give both the new and old names whenever a change occurred. 8.2. “Neutral-favor” mesons ( S = C = B = T =0) Table 8.1 shows the names for mesons having the strangeness and all heavy-flavor quantum numbers equal to zero. The scheme is designed for all ordinary non-exotic mesons, but it will work for many exotic types too, if needed. Table 8.1: Symbols for mesons with the strangeness and all heavy-flavor quantum numbers equal to zero. J PC = 0 + 1 + 1 −− 0 ++ 2 + 3 + 2 −− 1 ++ . . . . . . . . . . . . q q content 2 S +1 L J = 1 ( L even) J 1 ( L odd) J 3 ( L even) J 3 ( L odd) J u d, u u d d, d u ( I =1) πbρa d d + u u and/or s s ¾ ( I η, η ± h, h ± ω, φ f, f ± c c h c ψ χ c b b h b Υ χ b t t h t θχ t The J/ψ remains the . First, we assign names to those states with quantum numbers compatible with being q q states. The rows of the Table give the possible q q content. The columns give the possible parity/charge-conjugation states, = +, + , −− ,and++; these combinations correspond one-to-one with the angular-momentum state 2 S +1 L J of the q q system being 1 ( L even) J , 1 ( L odd) J , 3 ( L even) J ,or 3 ( L odd) J . Here S , L ,a n d J are the spin, orbital, and total angular momenta of the q q system. The quantum numbers are related by P =( 1) L +1 , C 1) L + S n d G parity = ( 1) L + S + I , whereo fcoursethe
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This note was uploaded on 06/07/2011 for the course PHYS 4132 taught by Professor Kutter during the Spring '11 term at University of Florida.

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rpp2010-rev-naming-scheme-hadrons - 8. Naming scheme for...

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