Search for weakly decaying and ΛΛ exotic bound states in central Pb-Pb collisions at
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We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible mmlsi1" class="mathmlsrc">w 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">mg class="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">mathContainer hidden">mathCode"><math altimg="si1.gif" overflow="scroll"><mover accent="true"><mrow><mi mathvariant="normal">Λmi><mi mathvariant="normal">nmi>mrow><mo>‾mo>mover>math> bound state. The search is performed with the ALICE detector in central (0–10%) Pb–Pb collisions at mmlsi2" class="mathmlsrc">w 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">mg class="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">mathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll"><msqrt><msub><mrow><mi>smi>mrow><mrow><mi mathvariant="normal">NNmi>mrow>msub>msqrt><mo>=mo><mn>2.76mn><mtext> TeVmtext>math>, by invariant mass analysis in the decay modes mmlsi13" class="mathmlsrc">w 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">mg class="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">mathContainer hidden">mathCode"><math altimg="si13.gif" overflow="scroll"><mover accent="true"><mrow><mi mathvariant="normal">Λmi><mi mathvariant="normal">nmi>mrow><mo>‾mo>mover><mo stretchy="false">→mo><mover accent="true"><mrow><mi mathvariant="normal">dmi>mrow><mo>‾mo>mover><msup><mrow><mi>πmi>mrow><mrow><mo>+mo>mrow>msup>math> and H-dibaryon mmlsi14" class="mathmlsrc">mulatext 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">→Λpπ&minus;mathContainer hidden">mathCode"><math altimg="si14.gif" overflow="scroll"><mo stretchy="false">→mo><mi mathvariant="normal">Λmi><mi mathvariant="normal">pmi><msup><mrow><mi>πmi>mrow><mrow><mo>&minus;mo>mrow>msup>math>. 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.
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