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">n‾ath>an>an>an> bound state. The search is performed with the ALICE detector in central (0–10%) Pb–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">n‾alse">→accent="true">athvariant="normal">d‾π+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">→Λpπ−an>an class="mathContainer hidden">an class="mathCode">ath altimg="si14.gif" overflow="scroll">alse">→athvariant="normal">Λathvariant="normal">pπ−ath>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.