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隆起的质量和宽度(4S)

Mass and width of the Upsilon(4S)

Eef van Beveren, George Rupp

摘要:

BABAR协作组关于e(-)+e(+)-->b+anti-b的最新数据[B. Aubert等人,Phys.Rev.Lett. 102,012001(2009),arXiv:0809.4120]中的能量范围内的B+反B和λ(b)(+)+ λ(b)(-)阈值进行了分析,在多通道的形式主义,其结合了通常的Breit-Wigner共振,但干扰背景信号,由于开放的底部阈值的开放。特别是,Uppermum(4S)共振被确定为具有10.735 GeV的质量和38 MeV的宽度。此外,两个更高的Uppermands共振识别,参数化,并分类。此外,委员会认为,发现在电子正电子湮没中,在B+anti-B阈值附近,由反应链e(-)+e(+)-->n+anti-n-->B+anti-B(n=u/d)而不是e(-)+e(+)-->b+anti-b-->B + anti-B(n=u/d)控制开底产生,而在B(s)+anti-B(s)阈值附近,由反应链e(-)+e(+)-->s+anti-s-->B+ anti-B(n = u/d)控制开底产生。B主导生产幅度。1980年定义的普遍约束频率在这一分析中起着至关重要的作用[E. van Beveren,C. Dullemond和G. Rupp,Phys.Rev.D21,772(1980)],并在1983年准确测定[E. van Beveren,G. T.A.拉普Rijken和C. Dullemond,Phys.Rev.D27,1527(1983)],进一步证实。

英文摘要:

Recent data on e(-)+e(+)-->b+anti-b by the BABAR Collaboration [B. Aubert et al, Phys. Rev. Lett. 102, 012001 (2009), arXiv:0809.4120] in the energy range delimited by the B+anti-B and Lambda(b)(+)+Lambda(b)(-) thresholds are analyzed in a multichannel formalism that incorporates the usual Breit-Wigner resonances, but interfering with a background signal due to the opening of open-bottom thresholds. In particular, the Upsilon(4S) resonance is determined to have a mass of 10.735 GeV and a width of 38 MeV. Also two higher Upsilon resonances are identified, parametrized, and classified. Moreover, it is found that near the B+anti-B threshold open-bottom production in electron-positron annihilation is dominated by the reaction chain e(-)+e(+)-->n+anti-n-->B+anti-B (n=u/d) rather than e(-)+e(+)-->b+anti-b-->B+anti-B whereas near the B(s)+anti-B(s) threshold the reaction chain e(-)+e(+)-->s+anti-s-->B+anti-B dominates the production amplitude. The vital role played in this analysis by the universal confinement frequency, defined in 1980 [E. van Beveren, C. Dullemond, and G. Rupp, Phys. Rev. D21, 772 (1980)] and accurately determined in 1983 [E. van Beveren, G. Rupp, T.A. Rijken, and C. Dullemond, Phys. Rev. D27, 1527 (1983)], is further confirmed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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