First measurement of pi(-)e ->pi(-)e gamma pion virtual compton scattering

Nemitkin, AV; Schiavon, P; Simon, J; Sitnikov, AI; Skow, D; Smith, VJ; Srivastava, M; Steiner, V; Stepanov, V; Stutte, L; Svoiski, M; Terentyev, NK; Thomas, GP; Uvarov, LN; Vasiliev, AN; Vavilov, DV; Verebryusov, VS; Victorov, VA; Vishnyakov, VE; Vorobyov, AA; Vorwalter, K; You, J; Zhao, WH; Zheng, SC; Zukanovich-Funchal, R; Ozkorucuklu, Suat; Kubarovsky, VP; Kulyavtsev, AI; Kuropatkin, NP; Kurshetsov, VF; Kushnirenko, A; Kwan, S; Lach, J; Lamberto, A; Landsberg, LG; Larin, I; Leikin, EM; Yunshan, L; Luksys, M; Lungov, T; Maleev, VP; Mao, D; Mao, CS; Mao, ZL; Mathew, P; Mattson, M; Matveev, V; McCliment, E; Moinester, MA; Molchanov, VV; Morelos, A; Nelson, KD; Neoustroev, PV; Newsom, C; Nilov, AP; Nurushev, SB; Ocherashvili, A; Onel, Y; Ozel, E; Ocherashvili, A; Alkhazov, G; Atamantchouk, AG; Balatz, MY; Bondar, NF; Cooper, PS; Dauwe, LJ; Davidenko, GV; Dersch, U; Dolgolenko, AG; Dzyubenko, GB; Edelstein, R; Emediato, L; Endler, AMF; Engelfried, J; Eschrich, I; Escobar, CO; Evdokimov, AV; Filimonov, IS; Garcia, FG; Gaspero, M; Giller, I; Golovtsov, VL; Gouffon, P; Gulmez, E; Kangling, H; Iori, M; Jun, SY; Kaya, M; Kilmer, J; Kim, VT; Kochenda, LM; Konorov, I; Kozhevnikov, AP; Krivshich, AG; Kruger, H; Kubantsev, MA; Penzo, A; Petrenko, SI; Pogodin, P; Pouh, B; Procario, M; Prutskoi, VA; Ramberg, E; Rappazzo, GF; Razmyslovich, BV; Rud, VI; Russ, J

Date

2002

Author

Nemitkin, AV

Schiavon, P

Simon, J

Sitnikov, AI

Skow, D

Smith, VJ

Srivastava, M

Steiner, V

Stepanov, V

Stutte, L

Svoiski, M

Terentyev, NK

Thomas, GP

Uvarov, LN

Vasiliev, AN

Vavilov, DV

Verebryusov, VS

Victorov, VA

Vishnyakov, VE

Vorobyov, AA

Vorwalter, K

You, J

Zhao, WH

Zheng, SC

Zukanovich-Funchal, R

Ozkorucuklu, Suat

Kubarovsky, VP

Kulyavtsev, AI

Kuropatkin, NP

Kurshetsov, VF

Kushnirenko, A

Kwan, S

Lach, J

Lamberto, A

Landsberg, LG

Larin, I

Leikin, EM

Yunshan, L

Luksys, M

Lungov, T

Maleev, VP

Mao, D

Mao, CS

Mao, ZL

Mathew, P

Mattson, M

Matveev, V

McCliment, E

Moinester, MA

Molchanov, VV

Morelos, A

Nelson, KD

Neoustroev, PV

Newsom, C

Nilov, AP

Nurushev, SB

Ocherashvili, A

Onel, Y

Ozel, E

Ocherashvili, A

Alkhazov, G

Atamantchouk, AG

Balatz, MY

Bondar, NF

Cooper, PS

Dauwe, LJ

Davidenko, GV

Dersch, U

Dolgolenko, AG

Dzyubenko, GB

Edelstein, R

Emediato, L

Endler, AMF

Engelfried, J

Eschrich, I

Escobar, CO

Evdokimov, AV

Filimonov, IS

Garcia, FG

Gaspero, M

Giller, I

Golovtsov, VL

Gouffon, P

Gulmez, E

Kangling, H

Iori, M

Jun, SY

Kaya, M

Kilmer, J

Kim, VT

Kochenda, LM

Konorov, I

Kozhevnikov, AP

Krivshich, AG

Kruger, H

Kubantsev, MA

Penzo, A

Petrenko, SI

Pogodin, P

Pouh, B

Procario, M

Prutskoi, VA

Ramberg, E

Rappazzo, GF

Razmyslovich, BV

Rud, VI

Russ, J

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Abstract

Pion virtual compton scattering (VCS) via the reaction pi(-)e-->pi(-)egamma was observed in the Fermilab E781 SELEX experiment. SELEX used a 600 GeV/c pi(-) beam incident on target atomic electrons, detecting the incident pi(-) and the final state pi(-), electron and gamma. Theoretical predictions based on chiral perturbation theory are incorporated into a Monte Carlo simulation of the experiment and are compared to the data. The number of reconstructed events (=9) and their distribution with respect to the kinematic variables (for the kinematic region studied) are in reasonable accord with the predictions. The corresponding pi(-) VCS experimental cross section is sigma=38.8+/-13 nb, in agreement with the theoretical expectation of sigma=34.7 nb.

URI

http://hdl.handle.net/20.500.12627/46170
https://doi.org/10.1103/physrevc.66.034613

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