Measurements of the reaction (p)over-bar-p→φη of antiproton annihilation at rest at three hydrogen target densities

被引：14

作者：

Alberico, V ^{[1
]}

Bertin, A

Bruschi, M

Capponi, M

De Castro, S

Dona, R

Ferretti, A

Galli, D

Giacobbe, B

Marconi, U

Piccinini, M

Poli, M

Cesari, NS

Spighi, R

Vagnoni, S

Vecchi, S

Vigotti, F

Villa, M

Vitale, A

Zoccoli, A

Bianconi, R

Corradini, M

Rizzini, EL

Venturelli, L

Zenoni, A

Cicalo, C

Masoni, A

Puddu, G

Serci, S

Temnikov, P

Usai, G

Gortchakov, O

Nomokonov, V

Prakhov, S

Rozhdestvensky, A

Sapozhnikov, M

Tretyak, V

Gianotti, P

Guaraldo, C

Lanaro, A

Lucherini, V

Nichitiu, F

Petrascu, C

Ableev, V

Cavion, C

Gastaldi, U

Lombardi, M

Maron, G

Vannucci, L

Vedovato, G

机构：

[1] Univ Bologna, Dipartmento Fis, Bologna, Italy

[2] Ist Nazl Fis Nucl, Sez Bologna, I-40126 Bologna, Italy

[3] Univ Brescia, Dipartimento Chim & Fis Ingn & Mat, I-25121 Brescia, Italy

[4] Ist Nazl Fis Nucl, Sez Pavia, I-27100 Pavia, Italy

[5] Univ Cagliari, Dipartimento Sci Fis, I-09100 Cagliari, Italy

[6] Ist Nazl Fis Nucl, Sez Cagliari, Cagliari, Italy

[7] Joint Inst Nucl Res, Dubna, Russia

[8] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[9] Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy

[10] Univ Pavia, Dipartimento Fis Nucl & Teor, I-27100 Pavia, Italy

[11] Shahid Beheshty Univ, Tehran, Iran

[12] Univ Turin, Dipartimento Fis Gen A Avogadro, Turin, Italy

[13] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

[14] Univ Turin, Ist Fis, Turin, Italy

[15] Politecn Torino, Dipartimento Fis, Turin, Italy

[16] Univ Trieste, Ist Fis, Trieste, Italy

[17] Ist Nazl Fis Nucl, Sez Trieste, Trieste, Italy

[18] Univ Udine, Ist Fis, I-33100 Udine, Italy

来源：

PHYSICS LETTERS B | 1998年 / 432卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(98)00633-9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The (p) over bar p annihilation at rest onto the phi eta final state was measured for three different target densities: liquid hydrogen, gaseous hydrogen at NTP and at a low pressure of 5 mbar. The yield of this reaction in the liquid hydrogen target is smaller than in the low-pressure gas target. The branching ratios of the phi eta channel were calculated on the basis of simultaneous analysis of the three data samples. The branching ratio for annihilation into phi eta from the S-3(1) protonium state turns out to be about ten times smaller as compared to the one from the P-1(1) state. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

引用

页码：427 / 435

页数：9

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