跟踪器设计对Higgs和Slepton测量的影响
Impact of Tracker Design on Higgs and Slepton Measurements
摘要：
假设国际直线对撞机（ILC）运行在500 GeV的质心能量（CME）下，积分亮度光度为500 $fb^{-1}$，我们研究了带电径迹分辨率对Higgs质量和Higgs质量在120 ~ 160 GeV之间的$e^+e^- \to Z^0 H, Z^0 \to \ell^+\ell^-, H \to X$过程中产生截面测量的影响，以及对三种不同质量对的Smuon对产生对Smuon质量测量的影响。估算了初态辐射、束流辐射和束流能散对Higgs和Smuon质量测量的影响。使用2001年北美基线探测器设计的快速蒙特卡罗模拟（LD和SD），我们发现ISR和束辐射对Higgs和Smuon质量的测量有显著影响：带电轨道动量分辨率对Higgs质量有显著影响，更好的轨道性能产生更好的Higgs质量分辨率和精度，轨道动量分辨率提高约5倍;径迹动量分辨率对Higgsstrahlung散射截面、$H \to C\bar{C}$分支比、Smuon和Neutralino质量的测量精度影响不大;束流能量分布优于0.2%左右对Higgs、Smuon和Neutralino质量的测量精度影响不大; SD探测器比LD探测器对Higgs质量的测量精度更高。
英文摘要：
We have studied the impact of charged track resolution on Higgs mass and production cross section measurement in the process $e^+e^- \to Z^0 H, Z^0 \to \ell^+\ell^-, H \to X$ for Higgs masses between 120 and 160 GeV, and on smuon mass measurement using smuon pair production for three different mass pairs, assuming the International Linear Collider(ILC) is operated at 500 GeV center of mass energies (CME) with integrated luminosities of 500 $fb^{-1}$. The effect of initial state radiation (ISR), beamstrahlung and beam energy spread on Higgs and smuon mass measurement are also estimated. Using fast Monte Carlo simulations of the 2001 North American baseline detector designs (LD and SD), we find that the ISR and beamstrahlung have significant impact on Higgs and smuon mass measurement; Charged track momentum resolution affect Higgs mass significantly with better track performance yielding better Higgs mass resolution and precision for the track momentum resolution improvement up to a factor of about 5; Track momentum resolution has little effect on the measurement precision of the Higgsstrahlung cross section, the branching ratio of $H \to C\bar{C}$, the smuon and neutralino masses; Beam energy spread better than about 0.2% has little effect on Higgs, smuon and neutralino masses; The SD detector provides a more accurate measurement than the LD of the Higgs mass.
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