Measurement of the angular distribution in (p)over-barp→ψ(2S)→ e+e-

被引：15

作者：

Ambrogiani, M

Andreotti, M

Argiro, S

Bagnasco, S

Baldini, W

Bettoni, D

Borreani, G

Buzzo, A

Calabrese, R

Cester, R

Cibinetto, G

Dalpiaz, P

Fan, X

Garzoglio, G

Gollwitzer, KE

Graham, M

Hahn, A

Hu, M

Jin, S

Joffe, D

Kasper, J

Lasio, G

Lo Vetere, M

Luppi, E

Maas, P

Macrí, M

Mandelkern, M

Marchetto, E

Marinelli, M

Marsh, W

Martini, M

Menichetti, E

Metreveli, Z

Mussa, R

Negrini, M

Obertino, MM

Pallavicini, M

Pastrone, N

Patrignani, C ^{[1
]}

Pedlar, TK

Pordes, S

Robutti, E

Roethel, W

Rosen, J

Rumerio, P

Rusack, R

Santroni, A

Schultz, J

Seo, SH

Seth, KK

机构：

[1] Ist Nazl Fis Nucl, I-16146 Genoa, Italy

[2] Univ Genoa, I-16146 Genoa, Italy

[3] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[4] Univ Ferrara, I-44100 Ferrara, Italy

[5] Ist Nazl Fis Nucl, I-44100 Ferrara, Italy

[6] Ist Nazl Fis Nucl, I-10125 Turin, Italy

[7] Univ Turin, I-10125 Turin, Italy

[8] Northwestern Univ, Evanston, IL 60208 USA

[9] Univ Calif Irvine, Irvine, CA 92697 USA

[10] Univ Minnesota, Minneapolis, MN 55455 USA

来源：

PHYSICS LETTERS B | 2005年 / 610卷 / 3-4期

关键词：

D O I：

10.1016/j.physletb.2005.01.093

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the first measurement of the angular distribution for the exclusive process (p) over barp -> psi(2S) -> e(+)e(-) based on a sample of 6844 events collected by the Fermilab E835 experiment. We find that the angular distribution is well described by the expected functional form d N/d cos theta* proportional to 1 + lambda cos(2) theta*, where theta* is the angle between the antiproton and the electron in the center of mass frame, with lambda = 0.67 +/- 0.15(stat) +/- 0.04(sys). The measured value for lambda implies a small but non-zero psi(2S) helicity 0 formation amplitude in (p) over barp, comparable to what is observed in J/psi decays to baryon pairs. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：177 / 182

页数：6

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