Onset of asymptotic scaling in deuteron photodisintegration.
We investigate the transition from the nucleon-meson to the quark-gluon description of the strong interaction using the photon energy dependence of the d(gamma,p)n differential cross section for photon energies above 0.5 GeV and center-of-mass proton angles between 30 degrees and 150 degrees. A possible signature for this transition is the onset of cross-section s(-11) scaling with the total energy squared, s, at some proton transverse momentum P(T). The results show that the scaling has been reached for proton transverse momentum above about 1.1 GeV/c. This may indicate that the quark-gluon regime is reached above this momentum.
Rossi
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P
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, PO 13, 00044 Frascati, Italy.
Mirazita
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Ronchetti
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De Sanctis
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Adams
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Ambrozewicz
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Anciant
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E
Anghinolfi
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M
Asavapibhop
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Audit
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Avakian
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Bagdasaryan
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H
Ball
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Barrow
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Battaglieri
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M
Beard
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Bektasoglu
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M
Bellis
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M
Benmouna
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Berman
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Bertozzi
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Bianchi
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Biselli
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Boiarinov
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Bonner
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Bouchigny
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Bradford
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Branford
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Briscoe
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Brooks
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Burkert
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Butuceanu
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Calarco
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Carman
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Carnahan
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Chen
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Cole
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Cords
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Corvisiero
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Crabb
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Crannell
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Cummings
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De Vita
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Degtyarenko
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PV
Denizli
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Dennis
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Deppman
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Dharmawardane
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KV
Dhuga
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Djalali
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Dodge
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Doughty
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Dragovitsch
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P
Dugger
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M
Dytman
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Dzyubak
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Egiyan
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Egiyan
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Elouadrhiri
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L
Empl
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Eugenio
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Fatemi
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Feuerbach
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Ficenec
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J
Forest
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Funsten
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Gai
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Gavalian
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Gilad
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S
Gilfoyle
G P
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Giovanetti
K L
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Gordon
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Griffioen
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K
Guidal
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M
Guillo
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Guo
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L
Gyurjyan
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Hadjidakis
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Hakobyan
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Hardie
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Heddle
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Hersman
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Hicks
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Hicks
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Holtrop
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Hu
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Hyde-Wright
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Ilieva
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Ito
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Jenkins
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Jo
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Joo
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Kellie
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Khandaker
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Kim
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Kim
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Kim
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Klein
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Klein
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Klimenko
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Klusman
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Kossov
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Kramer
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Kuhn
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Kuhn
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Lachniet
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J
Laget
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Lawrence
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D
Li
Ji
J
Lima
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AC
Livingston
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Lukashin
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Manak
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Marchand
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McAleer
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S
McCarthy
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J
McNabb
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Mecking
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BA
Mehrabyan
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S
Melone
J J
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Mestayer
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Meyer
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Mikhailov
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K
Miskimen
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R
Mokeev
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V
Morand
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L
Morrow
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Muccifora
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V
Mueller
J
J
Mutchler
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GS
Napolitano
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J
Nasseripour
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R
Niccolai
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S
Niculescu
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G
Niculescu
I
I
Niczyporuk
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Niyazov
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RA
Nozar
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M
O'Brien
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JT
O'Rielly
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GV
Osipenko
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Ostrovidov
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Park
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Pasyuk
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Peterson
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Philips
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Pivnyuk
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Pocanic
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Pogorelko
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Polli
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Pozdniakov
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Preedom
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Price
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Prok
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Protopopescu
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Qin
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Raue
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Riccardi
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Ricco
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Ripani
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Ritchie
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Rosner
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Rowntree
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Rubin
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Sabatié
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Salgado
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Santoro
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Schumacher
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Serov
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Sharabian
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Shaw
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Simionatto
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Skabelin
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Smith
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Smith
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Spraker
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Stavinsky
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Stepanyan
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Stokes
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Stoler
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Strakovsky
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Strauch
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Taiuti
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Taylor
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Tedeschi
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Thoma
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Thompson
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Todor
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Tur
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Ungaro
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Vineyard
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Vlassov
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Wang
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Weinstein
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Weller
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Weygand
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Whisnant
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Wolin
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Wood
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Yegneswaran
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Yun
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Zhang
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Zhou
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