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DOI 10.1103/physrevlett.115.082001

Медицинская библиотека · Physical review letters · 2015

Observation of a New Narrow Axial-Vector Meson a1(1420).

Adolph C, Akhunzyanov R, Alexeev M G, Alexeev G D, Amoroso A, Andrieux V, Anosov V, Austregesilo A, Azevedo C, Badełek B, Balestra F, Barth J, Beck R, Bedfer Y, Bernhard J, Bicker K, Bielert E R, Birsa R, Bisplinghoff J, Bodlak M, Boer M, Bordalo P, Bradamante F, Braun C, Bressan A, Büchele M, Burtin E, Chang W-C, Chiosso M, Choi I, Chung S U, Cicuttin A, Crespo M L, Curiel Q, Dalla Torre S, Dasgupta S S, Dasgupta S, Denisov O Yu, Dhara L, Donskov S V, Doshita N, Dünnweber W, Duic V, Dziewiecki M, Efremov A, Eversheim P D, Eyrich W, Faessler M, Ferrero A, Finger M, Finger M, Fischer H, Franco C, du Fresne von Hohenesche N, Friedrich J M, Frolov V, Gautheron F, Gavrichtchouk O P, Gerassimov S, Gnesi I, Gorzellik M, Grabmüller S, Grasso A, Grosse-Perdekamp M, Grube B, Grussenmeyer T, Guskov A, Haas F, Hahne D, von Harrach D, Hashimoto R, Heinsius F H, Herrmann F, Hinterberger F, Horikawa N, d'Hose N, Hsieh C-Yu, Huber S, Ishimoto S, Ivanov A, Ivanshin Yu, Iwata T, Jahn R, Jary V, Jörg P, Joosten R, Kabuß E, Ketzer B, Khaustov G V, Khokhlov Yu A, Kisselev Yu, Klein F, Klimaszewski K, Koivuniemi J H, Kolosov V N, Kondo K, Königsmann K, Konorov I, Konstantinov V F, Kotzinian A M, Kouznetsov O, Krämer M, Kremser P, Krinner F, Kroumchtein Z V, Kuchinski N, Kunne F, Kurek K, Kurjata R P, Lednev A A, Lehmann A, Levillain M, Levorato S, Lichtenstadt J, Maggiora A, Magnon A, Makins N, Makke N, Mallot G K, Marchand C, Martin A, Marzec J, Matousek J, Matsuda H, Matsuda T, Meshcheryakov G, Meyer W, Michigami T, Mikhailov Yu V, Miyachi Y, Nagaytsev A, Nagel T, Nerling F, Neyret D, Nikolaenko V I, Novy J, Nowak W-D, Nunes A S, Olshevsky A G, Orlov I, Ostrick M, Panzieri D, Parsamyan B, Paul S, Peng J-C, Pereira F, Pesek M, Peshekhonov D V, Platchkov S, Pochodzalla J, Polyakov V A, Pretz J, Quaresma M, Quintans C, Ramos S, Regali C, Reicherz G, Riedl C, Rocco E, Rossiyskaya N S, Ryabchikov D I, Rychter A, Samoylenko V D, Sandacz A, Santos C, Sarkar S, Savin I A, Sbrizzai G, Schiavon P, Schmeing S, Schmidt K, Schmieden H, Schönning K, Schopferer S, Schlüter T, Selyunin A, Shevchenko O Yu, Silva L, Sinha L, Sirtl S, Slunecka M, Sozzi F, Srnka A, Stolarski M, Sulc M, Suzuki H, Szabelski A, Szameitat T, Sznajder P, Takekawa S, Ter Wolbeek J, Tessaro S, Tessarotto F, Thibaud F, Tskhay V, Uhl S, Veloso J, Virius M, Wallner S, Weisrock T, Wilfert M, Zaremba K, Zavertyaev M, Zemlyanichkina E, Ziembicki M, Zink A, COMPASS Collaboration

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Аннотация

The COMPASS Collaboration at CERN has measured diffractive dissociation of 190  GeV/c pions into the π(-)π(-)π(+) final state using a stationary hydrogen target. A partial-wave analysis (PWA) was performed in bins of 3π mass and four-momentum transfer using the isobar model and the so far largest PWA model consisting of 88 waves. A narrow peak is observed in the f0(980)π channel with spin, parity and C-parity quantum numbers J(PC)=1(++). We present a resonance-model study of a subset of the spin-density matrix selecting 3π states with J(PC)=2(++) and 4(++) decaying into ρ(770)π and with J(PC)=1(++) decaying into f0(980)π. We identify a new a1 meson with mass (1414(-13)(+15))  MeV/c2 and width (153(-23)(+8))  MeV/c2. Within the final states investigated in our analysis, we observe the new a1(1420) decaying only into f0(980)π, suggesting its exotic nature.

Для цитирования: Adolph C, Akhunzyanov R, Alexeev M G, Alexeev G D, Amoroso A, Andrieux V, Anosov V, Austregesilo A, Azevedo C, Badełek B, Balestra F, Barth J, Beck R, Bedfer Y, Bernhard J, Bicker K, Bielert E R, Birsa R, Bisplinghoff J, Bodlak M, Boer M, Bordalo P, Bradamante F, Braun C, Bressan A, Büchele M, Burtin E, Chang W-C, Chiosso M, Choi I, Chung S U, Cicuttin A, Crespo M L, Curiel Q, Dalla Torre S, Dasgupta S S, Dasgupta S, Denisov O Yu, Dhara L, Donskov S V, Doshita N, Dünnweber W, Duic V, Dziewiecki M, Efremov A, Eversheim P D, Eyrich W, Faessler M, Ferrero A, Finger M, Finger M, Fischer H, Franco C, du Fresne von Hohenesche N, Friedrich J M, Frolov V, Gautheron F, Gavrichtchouk O P, Gerassimov S, Gnesi I, Gorzellik M, Grabmüller S, Grasso A, Grosse-Perdekamp M, Grube B, Grussenmeyer T, Guskov A, Haas F, Hahne D, von Harrach D, Hashimoto R, Heinsius F H, Herrmann F, Hinterberger F, Horikawa N, d'Hose N, Hsieh C-Yu, Huber S, Ishimoto S, Ivanov A, Ivanshin Yu, Iwata T, Jahn R, Jary V, Jörg P, Joosten R, Kabuß E, Ketzer B, Khaustov G V, Khokhlov Yu A, Kisselev Yu, Klein F, Klimaszewski K, Koivuniemi J H, Kolosov V N, Kondo K, Königsmann K, Konorov I, Konstantinov V F, Kotzinian A M, Kouznetsov O, Krämer M, Kremser P, Krinner F, Kroumchtein Z V, Kuchinski N, Kunne F, Kurek K, Kurjata R P, Lednev A A, Lehmann A, Levillain M, Levorato S, Lichtenstadt J, Maggiora A, Magnon A, Makins N, Makke N, Mallot G K, Marchand C, Martin A, Marzec J, Matousek J, Matsuda H, Matsuda T, Meshcheryakov G, Meyer W, Michigami T, Mikhailov Yu V, Miyachi Y, Nagaytsev A, Nagel T, Nerling F, Neyret D, Nikolaenko V I, Novy J, Nowak W-D, Nunes A S, Olshevsky A G, Orlov I, Ostrick M, Panzieri D, Parsamyan B, Paul S, Peng J-C, Pereira F, Pesek M, Peshekhonov D V, Platchkov S, Pochodzalla J, Polyakov V A, Pretz J, Quaresma M, Quintans C, Ramos S, Regali C, Reicherz G, Riedl C, Rocco E, Rossiyskaya N S, Ryabchikov D I, Rychter A, Samoylenko V D, Sandacz A, Santos C, Sarkar S, Savin I A, Sbrizzai G, Schiavon P, Schmeing S, Schmidt K, Schmieden H, Schönning K, Schopferer S, Schlüter T, Selyunin A, Shevchenko O Yu, Silva L, Sinha L, Sirtl S, Slunecka M, Sozzi F, Srnka A, Stolarski M, Sulc M, Suzuki H, Szabelski A, Szameitat T, Sznajder P, Takekawa S, Ter Wolbeek J, Tessaro S, Tessarotto F, Thibaud F, Tskhay V, Uhl S, Veloso J, Virius M, Wallner S, Weisrock T, Wilfert M, Zaremba K, Zavertyaev M, Zemlyanichkina E, Ziembicki M, Zink A, COMPASS Collaboration. Observation of a New Narrow Axial-Vector Meson a1(1420).. Physical review letters. 2015. DOI: 10.1103/physrevlett.115.082001.
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