$ \vecγp \ to k^+σ^0 $ at $e_γ= 8.5 $ gev中光子束不对称的测量

论文标题

$ \vecγp \ to k^+σ^0 $ at $e_γ= 8.5 $ gev中光子束不对称的测量

Measurement of the Photon Beam Asymmetry in $\vecγ p\to K^+Σ^0$ at $E_γ = 8.5$ GeV

论文作者

The GlueX Collaboration, Adhikari, S., Ali, A., Amaryan, M., Austregesilo, A., Barbosa, F., Barlow, J., Barriga, E., Barsotti, R., Beattie, T. D., Berdnikov, V. V., Black, T., Boeglin, W., Briscoe, W. J., Britton, T., Brooks, W. K., Cannon, B. E., Cao, N., Chudakov, E., Cole, S., Cortes, O., Crede, V., Dalton, M. M., Daniels, T., Deur, A., Dobbs, S., Dolgolenko, A., Dotel, R., Dugger, M., Dzhygadlo, R., Egiyan, H., Erbora, T., Ernst, A., Eugenio, P., Fanelli, C., Fegan, S., Foda, A. M., Foote, J., Frye, J., Furletov, S., Gan, L., Gasparian, A., Gleason, C., Goetzen, K., Goncalves, A., Goryachev, V. S., Guo, L., Hakobyan, H., Hamdi, A., Huber, G. M., Hurley, A., Ireland, D. G., Ito, M. M., Jarvis, N. S., Jones, R. T., Kakoyan, V., Kalicy, G., Kamel, M., Kourkoumelis, C., Kuleshov, S., Larin, I., Lawrence, D., Lersch, D. I., Li, H., Li, W., Liu, B., Livingston, K., Lolos, G. J., Lyubovitskij, V., Mack, D., Marukyan, H., Matveev, V., McCaughan, M., McCracken, M., McGinley, W., Meyer, C. A., Miskimen, R., Mitchell, R. E., Nerling, F., Ng, L., Ni, H., Ostrovidov, A. I., Papandreou, Z., Patsyuk, M., Paudel, C., Pauli, P., Pedroni, R., Pentchev, L., Peters, K. J., Phelps, W., Pooser, E., Qin, N., Reinhold, J., Ritchie, B. G., Robison, L., Romanov, D., Romero, C., Salgado, C., Schertz, A. M., Schumacher, R. A., Schwiening, J., Seth, K. K., Shen, X., Shepherd, M. R., Smith, E. S., Sober, D. I., Somov, A., Somov, S., Soto, O., Stevens, J. R., Strakovsky, I. I., Suresh, K., Tarasov, V. V., Taylor, S., Teymurazyan, A., Thiel, A., Vasileiadis, G., Whitlatch, T., Wickramaarachchi, N., Williams, M., Xiao, T., Yang, Y., Zarling, J., Zhang, Z., Zhou, Q., Zhou, X., Zihlmann, B.

论文摘要

我们使用Jefferson Lab的Hall D中的Gluex Spectrmeter表示，对反应$ \vecγP\ to K^+σ^0 $（1193）的光子束不对称$σ$的测量值进行了测量。使用线性极化的光子束在液态氢靶的8.2-8.8 GEV的能量范围内收集数据。梁的不对称$σ$是根据mandelstam变量$ t $的函数测量的，并且为$ u $ channel中产生的事件提取了单个值$σ$。这些是在此能量范围内反应的光子束不对称$σ$的第一个独家测量。对于$ t $ - 渠道，测得的梁不对称率接近所研究的$ t $范围，$ -t =（0.1-1.4）〜$（GEV/$ C $）$^{2} $，平均值为$σ= 1.00 \ pm 0.05 $。这与理论模型一致，这些模型通过$ k^{*} $（892）regge轨迹的自然差交换来描述反应。 $σ= 0.41 \ pm 0.09 $的值为$ u $ -CHANNEL的集成到$ -U = 2.0 $〜（GEV/$ C $）$^{2} $。

We report measurements of the photon beam asymmetry $Σ$ for the reaction $\vecγ p\to K^+Σ^0$(1193) using the GlueX spectrometer in Hall D at Jefferson Lab. Data were collected using a linearly polarized photon beam in the energy range of 8.2-8.8 GeV incident on a liquid hydrogen target. The beam asymmetry $Σ$ was measured as a function of the Mandelstam variable $t$, and a single value of $Σ$ was extracted for events produced in the $u$-channel. These are the first exclusive measurements of the photon beam asymmetry $Σ$ for the reaction in this energy range. For the $t$-channel, the measured beam asymmetry is close to unity over the $t$-range studied, $-t=(0.1-1.4)~$(GeV/$c$)$^{2}$, with an average value of $Σ= 1.00\pm 0.05$. This agrees with theoretical models that describe the reaction via the natural-parity exchange of the $K^{*}$(892) Regge trajectory. A value of $Σ= 0.41 \pm 0.09$ is obtained for the $u$-channel integrated up to $-u=2.0$~(GeV/$c$)$^{2}$.

下载PDF全文

下载文献需遵守相关版权规定

论文标题