Triangle Singularity as the Origin of the a(1) (1420)

Alexeev, GD; Alexeev, MG; Amoroso, A; Andrieux, V; Anosov, V; Antoshkin, A; Augsten, K; Augustyniak, W; Azevedo, CDR; Badelek, B; Balestra, F; Ball, M; Barth, J; Beck, R; Bedfer, Y; Antequera, JB; Bernhard, J; Bodlak, M; Bradamante, F; Bressan, A; Burtsev, VE; Chang, WC; Chatterjee, C; Chiosso, M; Chumakov, AG; Chung, SU; Cicuttin, A; Correia, PMM; Crespo, ML; D'Ago, D; Dalla Torre, S; Dasgupta, SS; Dasgupta, S; Denisenko, I; Denisov, OY; Donskov, SV; Doshita, N; Dreisbach, C; Dunnweber, W; Dusaev, RR; Efremov, A; Eversheim, PD; Faccioli, P; Faessler, M; Finger, M; Finger, M; Fischer, H; Franco, C; Friedrich, JM; Frolov, V; Gautheron, F; Gavrichtchouk, OP; Gerassimov, S; Giarra, J; Gnesi, I; Gorzellik, M; Grasso, A; Gridin, A; Perdekamp, MG; Grube, B; Guskov, A; von Harrach, D; Heitz, R; Herrmann, F; Horikawa, N; d'Hose, N; Hsieh, CY; Huber, S; Ishimoto, S; Ivanov, A; Iwata, T; Jandek, M; Jary, V; Joosten, R; Jorg, P; Kabuss, E; Kaspar, F; Kerbizi, A; Ketzer, B; Khaustov, GV; Khokhlov, YA; Kisselev, Y; Klein, F; Koivuniemi, JH; Kolosov, VN; Horikawa, KK; Konorov, I; Konstantinov, VF; Kotzinian, AM; Kouznetsov, OM; Koval, A; Kral, Z; Krinner, F; Kulinich, Y; Kunne, F; Kurek, K; Kurjata, RP; Kveton, A; Lavickova, K; Levorato, S; Lian, YS; Lichtenstadt, J; Lin, PJ; Longo, R; Lyubovitskij, VE; Maggiora, A; Magnon, A; Makins, N; Makke, N; Mallot, GK; Maltsev, A; Mamon, SA; Marianski, B; Martin, A; Marzec, J; Matousek, J; Matsuda, T; Mattson, G; Meshcheryakov, GV; Meyer, M; Meyer, W; Mikhailov, YV; Mikhasenko, M; Mitrofanov, E; Mitrofanov, N; Miyachi, Y; Moretti, A; Nagaytsev, A; Naim, C; Neyret, D; Novy, J; Nowak, WD; Nukazuka, G; Nunes, AS; Olshevsky, AG; Ostrick, M; Panzieri, D; Parsamyan, B; Paul, S; Pekeler, H; Peng, JC; Pesek, M; Peshekhonov, DV; Peskova, M; Pierre, N; Platchkov, S; Pochodzalla, J; Polyakov, VA; Pretz, J; Quaresma, M; Quintans, C; Reicherz, G; Riedl, C; Rudnicki, T; Ryabchikov, DI; Rybnikov, A; Rychter, A; Samoylenko, VD; Sandacz, A; Sarkar, S; Savin, IA; Sbrizzai, G; Schmieden, H; Selyunin, A; Sinha, L; Slunecka, M; Smolik, J; Srnka, A; Steffen, D; Stolarski, M; Subrt, O; Sulc, M; Suzuki, H; Sznajder, P; Tessaro, S; Tessarotto, F; Thiel, A; Tomsa, J; Tosello, F; Townsend, A; Tskhay, V; Uhl, S; Vasilishin, BI; Vauth, A; Veit, BM; Veloso, J; Ventura, B; Vidon, A; Virius, M; Wagner, M; Wallner, S; Zaremba, K; Zavada, P; Zavertyaev, M; Zemko, M; Zemlyanichkina, E; Zhao, Y; Ziembicki, M

Alexeev, GD (corresponding author), Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.

PHYSICAL REVIEW LETTERS, 2021; 127 (8):

Abstract

The COMPASS Collaboration experiment recently discovered a new isovector resonancelike signal with axial-vector quantum numbers, the a(1)(1420), decay......

Full Text Link