title: Measurement of exclusive π(0) electroproduction structure functions and their relationship to transverse generalized parton distributions.
abstract: Exclusive π(0) electroproduction at a beam energy of 5.75 GeV has been measured with the Jefferson Lab CLAS spectrometer. Differential cross sections were measured at more than 1800 kinematic values in Q(2), x(B), t, and ϕ(π), in the Q(2) range from 1.0 to 4.6  GeV(2), -t up to 2  GeV(2), and x(B) from 0.1 to 0.58. Structure functions σ(T)+ϵσ(L), σ(TT), and σ(LT) were extracted as functions of t for each of 17 combinations of Q(2) and x(B). The data were compared directly with two handbag-based calculations including both longitudinal and transversity generalized parton distributions (GPDs). Inclusion of only longitudinal GPDs very strongly underestimates σ(T)+ϵσ(L) and fails to account for σ(TT) and σ(LT), while inclusion of transversity GPDs brings the calculations into substantially better agreement with the data. There is very strong sensitivity to the relative contributions of nucleon helicity-flip and helicity nonflip processes. The results confirm that exclusive π(0) electroproduction offers direct experimental access to the transversity GPDs.
authors.affiliation: Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia.
authors.forename: I
authors.initials: I
authors.lastname: Bedlinskiy
authors.forename: V
authors.initials: V
authors.lastname: Kubarovsky
authors.forename: S
authors.initials: S
authors.lastname: Niccolai
authors.forename: P
authors.initials: P
authors.lastname: Stoler
authors.forename: K P
authors.initials: KP
authors.lastname: Adhikari
authors.forename: M
authors.initials: M
authors.lastname: Aghasyan
authors.forename: M J
authors.initials: MJ
authors.lastname: Amaryan
authors.forename: M
authors.initials: M
authors.lastname: Anghinolfi
authors.forename: H
authors.initials: H
authors.lastname: Avakian
authors.forename: H
authors.initials: H
authors.lastname: Baghdasaryan
authors.forename: J
authors.initials: J
authors.lastname: Ball
authors.forename: N A
authors.initials: NA
authors.lastname: Baltzell
authors.forename: M
authors.initials: M
authors.lastname: Battaglieri
authors.forename: R P
authors.initials: RP
authors.lastname: Bennett
authors.forename: A S
authors.initials: AS
authors.lastname: Biselli
authors.forename: C
authors.initials: C
authors.lastname: Bookwalter
authors.forename: S
authors.initials: S
authors.lastname: Boiarinov
authors.forename: W J
authors.initials: WJ
authors.lastname: Briscoe
authors.forename: W K
authors.initials: WK
authors.lastname: Brooks
authors.forename: V D
authors.initials: VD
authors.lastname: Burkert
authors.forename: D S
authors.initials: DS
authors.lastname: Carman
authors.forename: A
authors.initials: A
authors.lastname: Celentano
authors.forename: S
authors.initials: S
authors.lastname: Chandavar
authors.forename: G
authors.initials: G
authors.lastname: Charles
authors.forename: M
authors.initials: M
authors.lastname: Contalbrigo
authors.forename: V
authors.initials: V
authors.lastname: Crede
authors.forename: A
authors.initials: A
authors.lastname: D'Angelo
authors.forename: A
authors.initials: A
authors.lastname: Daniel
authors.forename: N
authors.initials: N
authors.lastname: Dashyan
authors.forename: R
authors.initials: R
authors.lastname: De Vita
authors.forename: E
authors.initials: E
authors.lastname: De Sanctis
authors.forename: A
authors.initials: A
authors.lastname: Deur
authors.forename: C
authors.initials: C
authors.lastname: Djalali
authors.forename: D
authors.initials: D
authors.lastname: Doughty
authors.forename: R
authors.initials: R
authors.lastname: Dupre
authors.forename: H
authors.initials: H
authors.lastname: Egiyan
authors.forename: A
authors.initials: A
authors.lastname: El Alaoui
authors.forename: L
authors.initials: L
authors.lastname: El Fassi
authors.forename: L
authors.initials: L
authors.lastname: Elouadrhiri
authors.forename: P
authors.initials: P
authors.lastname: Eugenio
authors.forename: G
authors.initials: G
authors.lastname: Fedotov
authors.forename: S
authors.initials: S
authors.lastname: Fegan
authors.forename: J A
authors.initials: JA
authors.lastname: Fleming
authors.forename: T A
authors.initials: TA
authors.lastname: Forest
authors.forename: A
authors.initials: A
authors.lastname: Fradi
authors.forename: M
authors.initials: M
authors.lastname: Garçon
authors.forename: N
authors.initials: N
authors.lastname: Gevorgyan
authors.forename: K L
authors.initials: KL
authors.lastname: Giovanetti
authors.forename: F X
authors.initials: FX
authors.lastname: Girod
authors.forename: W
authors.initials: W
authors.lastname: Gohn
authors.forename: R W
authors.initials: RW
authors.lastname: Gothe
authors.forename: L
authors.initials: L
authors.lastname: Graham
authors.forename: K A
authors.initials: KA
authors.lastname: Griffioen
authors.forename: B
authors.initials: B
authors.lastname: Guegan
authors.forename: M
authors.initials: M
authors.lastname: Guidal
authors.forename: L
authors.initials: L
authors.lastname: Guo
authors.forename: K
authors.initials: K
authors.lastname: Hafidi
authors.forename: H
authors.initials: H
authors.lastname: Hakobyan
authors.forename: C
authors.initials: C
authors.lastname: Hanretty
authors.forename: D
authors.initials: D
authors.lastname: Heddle
authors.forename: K
authors.initials: K
authors.lastname: Hicks
authors.forename: M
authors.initials: M
authors.lastname: Holtrop
authors.forename: Y
authors.initials: Y
authors.lastname: Ilieva
authors.forename: D G
authors.initials: DG
authors.lastname: Ireland
authors.forename: B S
authors.initials: BS
authors.lastname: Ishkhanov
authors.forename: E L
authors.initials: EL
authors.lastname: Isupov
authors.forename: H S
authors.initials: HS
authors.lastname: Jo
authors.forename: K
authors.initials: K
authors.lastname: Joo
authors.forename: D
authors.initials: D
authors.lastname: Keller
authors.forename: M
authors.initials: M
authors.lastname: Khandaker
authors.forename: P
authors.initials: P
authors.lastname: Khetarpal
authors.forename: A
authors.initials: A
authors.lastname: Kim
authors.forename: W
authors.initials: W
authors.lastname: Kim
authors.forename: F J
authors.initials: FJ
authors.lastname: Klein
authors.forename: S
authors.initials: S
authors.lastname: Koirala
authors.forename: A
authors.initials: A
authors.lastname: Kubarovsky
authors.forename: S E
authors.initials: SE
authors.lastname: Kuhn
authors.forename: S V
authors.initials: SV
authors.lastname: Kuleshov
authors.forename: N D
authors.initials: ND
authors.lastname: Kvaltine
authors.forename: K
authors.initials: K
authors.lastname: Livingston
authors.forename: H Y
authors.initials: HY
authors.lastname: Lu
authors.forename: I J D
authors.initials: IJ
authors.lastname: MacGregor
authors.forename: Y
authors.initials: Y
authors.lastname: Mao
authors.forename: N
authors.initials: N
authors.lastname: Markov
authors.forename: D
authors.initials: D
authors.lastname: Martinez
authors.forename: M
authors.initials: M
authors.lastname: Mayer
authors.forename: B
authors.initials: B
authors.lastname: McKinnon
authors.forename: C A
authors.initials: CA
authors.lastname: Meyer
authors.forename: T
authors.initials: T
authors.lastname: Mineeva
authors.forename: M
authors.initials: M
authors.lastname: Mirazita
authors.forename: V
authors.initials: V
authors.lastname: Mokeev
authors.forename: H
authors.initials: H
authors.lastname: Moutarde
authors.forename: E
authors.initials: E
authors.lastname: Munevar
authors.forename: C
authors.initials: C
authors.lastname: Munoz Camacho
authors.forename: P
authors.initials: P
authors.lastname: Nadel-Turonski
authors.forename: G
authors.initials: G
authors.lastname: Niculescu
authors.forename: I
authors.initials: I
authors.lastname: Niculescu
authors.forename: M
authors.initials: M
authors.lastname: Osipenko
authors.forename: A I
authors.initials: AI
authors.lastname: Ostrovidov
authors.forename: L L
authors.initials: LL
authors.lastname: Pappalardo
authors.forename: R
authors.initials: R
authors.lastname: Paremuzyan
authors.forename: K
authors.initials: K
authors.lastname: Park
authors.forename: S
authors.initials: S
authors.lastname: Park
authors.forename: E
authors.initials: E
authors.lastname: Pasyuk
authors.forename: S
authors.initials: S
authors.lastname: Anefalos Pereira
authors.forename: E
authors.initials: E
authors.lastname: Phelps
authors.forename: S
authors.initials: S
authors.lastname: Pisano
authors.forename: O
authors.initials: O
authors.lastname: Pogorelko
authors.forename: S
authors.initials: S
authors.lastname: Pozdniakov
authors.forename: J W
authors.initials: JW
authors.lastname: Price
authors.forename: S
authors.initials: S
authors.lastname: Procureur
authors.forename: Y
authors.initials: Y
authors.lastname: Prok
authors.forename: D
authors.initials: D
authors.lastname: Protopopescu
authors.forename: A J R
authors.initials: AJ
authors.lastname: Puckett
authors.forename: B A
authors.initials: BA
authors.lastname: Raue
authors.forename: G
authors.initials: G
authors.lastname: Ricco
authors.forename: D
authors.initials: D
authors.lastname: Rimal
authors.forename: M
authors.initials: M
authors.lastname: Ripani
authors.forename: G
authors.initials: G
authors.lastname: Rosner
authors.forename: P
authors.initials: P
authors.lastname: Rossi
authors.forename: F
authors.initials: F
authors.lastname: Sabatié
authors.forename: M S
authors.initials: MS
authors.lastname: Saini
authors.forename: C
authors.initials: C
authors.lastname: Salgado
authors.forename: N
authors.initials: N
authors.lastname: Saylor
authors.forename: D
authors.initials: D
authors.lastname: Schott
authors.forename: R A
authors.initials: RA
authors.lastname: Schumacher
authors.forename: E
authors.initials: E
authors.lastname: Seder
authors.forename: H
authors.initials: H
authors.lastname: Seraydaryan
authors.forename: Y G
authors.initials: YG
authors.lastname: Sharabian
authors.forename: G D
authors.initials: GD
authors.lastname: Smith
authors.forename: D I
authors.initials: DI
authors.lastname: Sober
authors.forename: D
authors.initials: D
authors.lastname: Sokhan
authors.forename: S S
authors.initials: SS
authors.lastname: Stepanyan
authors.forename: S
authors.initials: S
authors.lastname: Stepanyan
authors.forename: S
authors.initials: S
authors.lastname: Strauch
authors.forename: M
authors.initials: M
authors.lastname: Taiuti
authors.forename: W
authors.initials: W
authors.lastname: Tang
authors.forename: C E
authors.initials: CE
authors.lastname: Taylor
authors.forename: Ye
authors.initials: Y
authors.lastname: Tian
authors.forename: S
authors.initials: S
authors.lastname: Tkachenko
authors.forename: M
authors.initials: M
authors.lastname: Ungaro
authors.forename: M F
authors.initials: MF
authors.lastname: Vineyard
authors.forename: A
authors.initials: A
authors.lastname: Vlassov
authors.forename: H
authors.initials: H
authors.lastname: Voskanyan
authors.forename: E
authors.initials: E
authors.lastname: Voutier
authors.forename: N K
authors.initials: NK
authors.lastname: Walford
authors.forename: D P
authors.initials: DP
authors.lastname: Watts
authors.forename: L B
authors.initials: LB
authors.lastname: Weinstein
authors.forename: D P
authors.initials: DP
authors.lastname: Weygand
authors.forename: M H
authors.initials: MH
authors.lastname: Wood
authors.forename: N
authors.initials: N
authors.lastname: Zachariou
authors.forename: J
authors.initials: J
authors.lastname: Zhang
authors.forename: Z W
authors.initials: ZW
authors.lastname: Zhao
authors.forename: I
authors.initials: I
authors.lastname: Zonta