6 research outputs found
Lepton Energy Asymmetry and Precision SUSY study at Hadron Colliders
We study the distribution of lepton pairs from the second lightest neutralino
decay \tilde{\chi}^0_2-->\tilde{l}l followed by \tilde{l}\to \tilde{\chi}^0_1
l. The distribution of the ratio of lepton transverse momenta A_T shows peak
structure if m_{ll}< m^{max}_{ll}/2 is required. The peak position A_T^{peak}
is described by a simple function of the ino and slepton masses in the
m_{ll}\sim 0 limit. When a moderate m_{ll} cut is applied, A_T^{peak} depends
on the \tilde{\chi}^0_2 velocity distribution, but the dependence would be
corrected by studying the lepton P_T distribution. A_T^{peak} and the edge of
m_{ll} distributions are used to determine the mass parameters involved in the
decay for parameters of interest to LHC experiments. For some cases the ino and
slepton masses may be determined within 10% by the lepton distribution only
independent of model assumptions. Correct combinations of A_{T}^{peak} and
m_{ll}^{edge} would be identified even if different \tilde{\chi}^0_2 decay
chains are co-existing. The analysis could be extended to the Tevatron energy
scale or other cascade decays.Comment: 31 pages, 15 figure
Scrutinizing LSP Dark Matter at the LHC
We show that LHC experiments might well be able to determine all the
parameters required for a prediction of the present density of thermal LSP
relics from the Big Bang era. If the LSP is an almost pure bino we usually only
need to determine its mass and the mass of the SU(2) singlet sleptons. This
information can be obtained by reconstructing the cascade . The only requirement is that ,
which is true for most of the cosmologically interesting parameter space. If
the LSP has a significant higgsino component, its predicted thermal relic
density is smaller than for an equal--mass bino. We show that in this case
squark decays also produce significant numbers of and
. Reconstructing the corresponding decay cascades then
allows to determine the higgsino component of the LSP
アタラシイハドロンスキームニヨルバリオンキョウメイジョウタイノホウカイ
京都大学0048新制・論文博士理学博士乙第3266号論理博第564号新制||理||244(附属図書館)5163UT51-52-L83(主査)教授 田中 正, 教授 町田 茂, 教授 三宅 弘三学位規則第5条第2項該当Kyoto UniversityDA
Genealogy of Modern Physics : From Einstein to Yukawa and Tomonaga
この論文は国立情報学研究所の電子図書館事業により電子化されました