Summary Talk: Partile Physis Phenomenology
Erasmo Ferreira
InstitutodeFisia,U.F.R.J.,
Riode Janeiro, RJ,21945-970, Brasil
E-mail: erasmoif.ufrj.br
Reeivedon25February,2001
We summarize the ontributed papers and the talksin the plenary and parallel sessions in this
XXIBrazilian NationalMeeting onPartiles and Fields that are lassied as of phenomenology
kind. Wetrytoputtheativitieshere developedintheperspetiveoftheexisting ommunityof
phenomenologistsinBrazil2000.
Wereallthatthephenomenologyoftheinteration
of elementary partileswasprobably ourmain areaof
reasearh in the time when physis researh in Brazil
began, in the 1940, 1950 deades. It is interestingto
remarkthatatthosetimestherewasfairamountof
ex-perimentalativityinpartilephysisinBrazil(osmi
rays,nulearemulsions),andtherewasalsothe
remark-ableworkofCesarLattesinBristolandintheChiago
aelerator. Sinethen,forsomedeades,therewasless
experimentalpartilephysisthanthereshouldbe,and
orrespondingly theoretial phenomenology developed
slowlyin theountry. Itwasnotatalleasyto workin
phenomenologyinaplaelikeBrazilbeforetheinternet
ametosolvetheinformation/ommuniationproblem.
Experimental data andtheoretial ideasouldusually
takeseveralmonthstoreahphysiistshere.
Somedeadesagotheelementarypartileswerethe
mesons,nuleons,eletrons,photons...,andthestudyof
theirinterationsweretheonernofelementary
parti-le physis. QEDsueededbeautifully,andthe
stru-tureoftheweakinterationswasunderstood,whilethe
strong interations remainedforseveraldeades asan
unsolved problem, in spite of the brilliant desription
of thehadronspetrosopythroughSU(3).
Thentheenergieswentup,andtheinvestigationsof
the eletroweak properties ofheavy quarksand leptons
andofintermediatevetorbosonstooktheenterofthe
stage andbeamethedenition ofelementary partile
physisresearh,thestandardmodelbeinginvestigated
thoroughly. The Higgs boson, its only undisovered
building blok,seemstobearoundtheorner,
aord-ingtoexperimentsdesribedinthismeeting. Brazilian
physiists have been working atively in both
experi-mental and theoretialaspets of these investigations,
as exhibitedinthepresentmeeting.
Thestronginterations,withthediÆultiesaused
of QCD,poses big problems in alulationsof hadron
prodution and hadroni interations. Methods and
onepts must be developed to fae these questions.
The fundamental properties of QCD (vauum
stru-ture,mehanismsof onnement,behaviourof matter
athighdensitiesandhigh temperatures) arestill
mys-terious. Thespeiityoftheproblemsreatesthearea
alledhadronphysis(thestudyofhadronistrutures
andinterations).
ThebiggesteletronmahineLEPisnowlosed,its
plaebeingtakenoverbyLHC,thattogetherwithF
er-milabTevatronandRHICatBNLwillformagroupof
hadronimahines wherethestudiesofthe
fundamen-tal interations and the searh for fundamental
on-stituentswillbemade. Besidesthem, therewillbethe
e +
e ollidersdediatedmainly tob-physis.
It is remarkablethat HadronPhysisis well
orga-nized in Brazil, with a strong and ative ommunity
that holds regular meetings of both national and
in-ternationalsope. Only a small part of this
ommu-nitypartiipateregularlyinENFPC.Withthehanges
in the frontiers of partile physis researh desribed
above, it is important that more ommuniation and
moremergingdevelopsbetweentheareas.
The amount of partile physis researh presented
inthehadronimeetingsouldenrihsubstantiallythe
programsof ENFPC, andeortmust bemade in this
diretion.
On the other hand, the interfae between partile
andnulearphysis,inlargepartprovidedbyhadroni
physis, must be inentivated in Brazil. Modern
Nu-learPhysismustbeQCDbased,whihrequiresrather
profound hanges in the researh that is
inter-hadroni physis must be developed to impulsionate
thesehanges.
The Plenary Sessions
PL1-MariaBeatriz GayDuati, UFRGS, Brazil:
HighDensityQCD.
PL2 - Jonathan L. Rosner,Universityof Chiago,
USA:CPViolation: Past,PresentandFuture.
The Parallel Sessions
PA1 - Gast~ao Krein, IFT/Unesp, Brazil : The
Gerasimov-Drell-HearnSum Rule andthe Spin
Stru-tureof theProton.
PA2-MareloM.Guzzo,UNICAMP,Brazil: New
ParadigmsinNeutrinoPhysis.
I nd that the organizingommittee waswiseand
lukyin hoosing thesetopisfortheplenaryand
par-allelsessions inphenomenology.
M.B. Gay Duati desribed the work of hers and
her students on thediÆult dynamis of QCD in the
onnementregime. Inludingunitarityandsreening
orretionsintheevolutionequations,theyobtainnew
equations,whiharethensolvedwithapproximations,
toobtainobservablequantitiesoftheprotonstruture.
Thesreeningorretionswillbepartiularlyimportant
intheanalysisoftheheavyionandhadroniollisions
thatwill beobservedinfutureaelerators.
J.L.Rosnerpresentedabeautifulandompetent
re-viewofthestudiesofCP violationthat date sinethe
rstdisoveryofneutralK 0
mesonsdeayinginwrong
CP states. The violation of CP symmetry, whih is
related to the behaviour of systemsunder time
rever-sal, is now under intense srutiny by experimentalists
andtheorists,whotrytounderstand allaspetsofthe
systemsanddynamisinvolved. Thestudieswilllarify
theparametersofthestandardmodelandthedynamis
oftheeletroweakinteration. TheBmesonsprodued
inFermilabandinthebfatoriesinCornell,SLACand
KEKandtheomplexexperimentsto study Kdeays
in CERNand Fermilab aregivingextensiveand
au-rate information for this fundamental area of partile
physis.
In spite of the frightening title (how many people
knewabout theGDH sumrule, with all itssimpliity
and exatness?) the talk by Gast~ao Krein was
ped-agogially very lear and stimulating. Interesting to
hear how the lowenergy photonexperiments antest
the proton struture, omplementingthe studies with
deep inelasti satteringmade in the high energy
ma-hines. It wasnie to hear about theRagusa
polariz-abilities(SilvestreRagusa,ourolleaguefromS~ao
Car-los),whihwereintrodued manyyears agoandare a
usefultoolin thesestudies.
Neutrino physis has been a very hot subjet in
questions, and a dramati eet in our knowledge of
the fundamental partiles, due to thedisoveryof the
non-zeroneutrinomassesandtheneutrinoosillations.
Thedisoveriesareimportantalsoforosmologyasfor
thestudy ofthephysisproessesinside thesun. The
numberandnature(maysomeofthembeofMajorana
kind?) of theneutrinos, and theirmassspetrumwill
beinvestigatedforseveralyears toome. Thetalk by
Guzzo was a very eluidating and updated review of
thesituation.
Oral Presentations in Phenomenology
ORAL01 : SUSY: radiative eets on squark
produ-tion.
ORAL02: SUSY:signaturesforR-parityviolation.
ORAL03 : Beyond standardmodel: signatures for
ex-tralargedimensions.
ORAL04 : Solar neutrinoproblem solutionwith
spin-avorpreession.
ORAL05 : Solarneutrino problemsolutionwith
long-wavelengthneutrinoosillations.
ORAL06: Neutrinoosillationsduetoquantum
deo-herene.
ORAL07 : Beyond thestandardmodel: exotibosons
ofharge2deayinginto2leptonsin 3-3-1model.
ORAL08 : Neutrino mass osillations formulae more
arefullyevaluatedwithwavepaketsformedinthe
re-ationproess.
ORAL09 : Nambu-Jona-Lasiniomodelin a
renormal-izableversionto evaluatemesoniobservables.
ORAL10: SUSY:leptoquarkseetsinDrell-Yan
pro-esses.
ORAL11 : Beyond thestandard model: CP violation
desribedbynewoperators.
ORAL12 : Beyondthestandardmodel: produtionof
hargedheavyleptons.
Posters in Phenomenology
P066: breakingofhiralsymmetrydue toinfrared
di-vergeneinthegluonpropagator.
P067: possibilityof neutrinodetetionintheshowers
tobeobservedin Augerexperiment.
P068: spaialgluondistributioninsidetheprotonand
itsinuenein theobservedgluonstruturefuntion.
P069 : harmonium prodution as a mixture of the
perturbativeandthe(smaller)nonperturbative
ontri-butions.
P070 : soliton (skyrmion) ongurationsstudied with
three possible forms of stabilizing terms added in the
hiralnonlinearsigmamodel.
P071: Nambu-JonaLasiniomodeltostudyspin1
P072 : omplex (real plus quaternioni) potentials in
nonrelativistiquantummehanisdesribedeay
pro-esses,withtimereversalnon-invarianeandthus
pos-sible onnetiontoCPviolation.
P073 : potential models to desribe heavy quarkonia
bound states, with evaluation of mass spetrum and
transition rates.
P074: analysisofppross-setionsathigh(osmiray)
energies ( p
s >10 GeV) from dierent preditionsand
evaluationoftherealpartparameterusingdispersion
relations.
P075: studyoftherepresentationofelastidierential
rosssetionsbyprolefuntions ofgaussianform.
P076 : Nambu-Jona-Lasiniomodel with parametrized
onstituentmassesto studymesoniobservables.
P077: Fluxof nuleiinprimary osmi raysasorigin
of observedhadroniand eletromagnetiintensities.
P078 : Beyond the standardmodel: form fators for
ouplingsof3neutralbosons.
P079: Vetormesonphotoprodutiondesribedby
su-perposition ofhardandsoftontributions.
P080 : Perturbative QCD alulation (exhange of
gluonladders)ofppandrmpp rosssetions.
P081 : Analysis of solarneutrinos observedin
Super-Kamiokand experiment, with determination of masses
andosillationparameters.
P082: Diusionofhadroniuxesfromosmiraysin
theatmosphere.
P083: Beyondthestandardmodel: eets ofaheavy
exotileptoninthee +
e !2Z 0
proess.
P084 : QCD eets of dynamial gluon mass in
hadronideaysofheavyvetormesons.
P085 : QCDnulear (deuterium) eets in the
deter-mination ofparton densities.
P086:Beyondthestandardmodel: supergravitymodel
leads to salar and pseudosalar partiles oupled to
photonsthataet osmologialobservables.
P087: Nambu-Jona-Lasiniomodel withanalytial
ex-tensionofthe4-pointfuntionthatproduesquark
on-nement.
P088: Quarkmodeldetermination ofmixinganglesin
mesoninonets.
P089: Standardmodelalulationof !
with
eetivehadroniorretions.
P090: Spinasymmetriesinthenalstatesinpolarized
proton-protonollisions.
P091 : Experimental: Fluoresene detetor for the
AugerObservatory.
P092: Experimental: separationbetween
eletromag-neti and muoni omponents in observed showers in
theAugerexperiment.
P093 : Experimental : Flutuationsin ompositionof
showersin Augerexperiment.
P094: Solarneutrinoproblemwiththespin-avor
pre-essionsolution.
P095 : Neutrino interations with avor hanging in
future neutrinofatories.
P096: Modelwithompositequarks.
P097 : Eetive hiral lagrangian for NN interation
P098 : QCD eets in photoprodution of vetor
mesons.
P099: Strangenessontentinnuleonstruture.
P100 : Beyond standard model : prodution of new
neutralleptons.
P101: Crossingsymmetryviolationinhiral
perturba-tiontheory.
SubmittedContributions in Phenomenology
12 Oral+ 36 Posters
Distibutionof Subjets
PhysisOutsidetheStandardModel
SusyTests: 4
OtherModels: 6
StrongInteration,LowEnergies
Eetive,Chiral,Skyrmions: 5
Models(NJL):4
StrongInterations,HighEnergies
QCD(Perturbative+Nonperturbative): 7
QuarkandPotentialModels: 4
HadroniCollisions: 2
Neutrinos
Solar Problem: 5
OsillationEets: 5
CPViolation: 2
CosmiRays
ModelsforC.R.Fluxes: 2
Experimental (Auger): 3
Strutureof Quarks: 1
What is Missing-and shouldbe here
PreisionTestsoftheStandardModel
DeterminationofCKMMatrixElements
Heavy Flavours - matrixelements, form fators,
deayrates.
Quark-gluonandnulearmatter.
ResearhismadeintheseareasinBrazil,asanbe
seenin other meetings that were held in Brazil in the
