用户名: 密码: 验证码:
Search for weakly decaying and ΛΛ exotic bound states in central Pb-Pb collisions at
详细信息    查看全文
文摘
We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible an id="mmlsi1" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009041&_mathId=si1.gif&_user=111111111&_pii=S0370269315009041&_rdoc=1&_issn=03702693&md5=0efe050d129cd2597cc5681f03157dec">ass="imgLazyJSB inlineImage" height="12" width="22" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315009041-si1.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si1.gif" overflow="scroll">accent="true">athvariant="normal">Λathvariant="normal">nath>an>an>an> bound state. The search is performed with the ALICE detector in central (0&ndash;10%) Pb&ndash;Pb collisions at an id="mmlsi2" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009041&_mathId=si2.gif&_user=111111111&_pii=S0370269315009041&_rdoc=1&_issn=03702693&md5=95aca5442a55c4cc8c7e6edcad7fa057">ass="imgLazyJSB inlineImage" height="15" width="105" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315009041-si2.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si2.gif" overflow="scroll">sathvariant="normal">NN=2.76 TeVath>an>an>an>, by invariant mass analysis in the decay modes an id="mmlsi13" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009041&_mathId=si13.gif&_user=111111111&_pii=S0370269315009041&_rdoc=1&_issn=03702693&md5=199580790dd5418f348a289d43e3ed5b">ass="imgLazyJSB inlineImage" height="13" width="70" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315009041-si13.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si13.gif" overflow="scroll">accent="true">athvariant="normal">Λathvariant="normal">nalse">&rarr;accent="true">athvariant="normal">dπ+ath>an>an>an> and H-dibaryon an id="mmlsi14" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009041&_mathId=si14.gif&_user=111111111&_pii=S0370269315009041&_rdoc=1&_issn=03702693&md5=ff3f0f625116bb8d119d221b5d968b45" title="Click to view the MathML source">&rarr;Λpπan>an class="mathContainer hidden">an class="mathCode">ath altimg="si14.gif" overflow="scroll">alse">&rarr;athvariant="normal">Λathvariant="normal">pπath>an>an>an>. No evidence for these bound states is observed. Upper limits are determined at 99% confidence level for a wide range of lifetimes and for the full range of branching ratios. The results are compared to thermal, coalescence and hybrid UrQMD model expectations, which describe correctly the production of other loosely bound states, like the deuteron and the hypertriton.

© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号

地址:北京市海淀区学院路29号 邮编:100083

电话:办公室:(+86 10)66554848;文献借阅、咨询服务、科技查新:66554700