Measurement of the lifetime
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Using a data set corresponding to an integrated luminosity of lsi2" class="mathmlsrc">lass="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316305779&_mathId=si2.gif&_user=111111111&_pii=S0370269316305779&_rdoc=1&_issn=03702693&md5=d3ed4e2b5b9f6fb7dd8b454ad4020fac" title="Click to view the MathML source">3 fb−1lass="mathContainer hidden">lass="mathCode">ltimg="si2.gif" overflow="scroll">3w> fbw>w>1w>, collected by the LHCb experiment in pp   collisions at centre-of-mass energies of 7 and 8 TeV, the effective lifetime in the lsi1" class="mathmlsrc">le="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316305779&_mathId=si1.gif&_user=111111111&_pii=S0370269316305779&_rdoc=1&_issn=03702693&md5=eb9fe7373a0fa2f9e69955ed5d96d05a">lass="imgLazyJSB inlineImage" height="17" width="74" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316305779-si1.gif">lass="mathContainer hidden">lass="mathCode">ltimg="si1.gif" overflow="scroll">w>Bw>w>sw>w>0w>lse">→Jlse">/ψη decay mode, lsi33" class="mathmlsrc">lass="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316305779&_mathId=si33.gif&_user=111111111&_pii=S0370269316305779&_rdoc=1&_issn=03702693&md5=c67dfc02f6b4d1cad40d5fa82c18f0a7" title="Click to view the MathML source">τefflass="mathContainer hidden">lass="mathCode">ltimg="si33.gif" overflow="scroll">w>τw>w>l">effw>, is measured to be
lass="formula" id="fm0010">
lass="mathml">lsi5" class="mathmlsrc">lass="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316305779&_mathId=si5.gif&_user=111111111&_pii=S0370269316305779&_rdoc=1&_issn=03702693&md5=755f07b8ecdea72ac1e161f0d70fbb4a" title="Click to view the MathML source">τeff=1.479±0.034 (stat)±0.011 (syst) ps.lass="mathContainer hidden">lass="mathCode">ltimg="si5.gif" overflow="scroll">w>τw>w>l">effw>=1.479±0.034 (stat)±0.011 (syst) ps.lass="temp" src="/sd/blank.gif">
Assuming CP   conservation, lsi33" class="mathmlsrc">lass="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316305779&_mathId=si33.gif&_user=111111111&_pii=S0370269316305779&_rdoc=1&_issn=03702693&md5=c67dfc02f6b4d1cad40d5fa82c18f0a7" title="Click to view the MathML source">τefflass="mathContainer hidden">lass="mathCode">ltimg="si33.gif" overflow="scroll">w>τw>w>l">effw> corresponds to the lifetime of the light lsi105" class="mathmlsrc">le="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316305779&_mathId=si105.gif&_user=111111111&_pii=S0370269316305779&_rdoc=1&_issn=03702693&md5=2e683e6a7f29bd499403821400614d11">lass="imgLazyJSB inlineImage" height="17" width="17" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316305779-si105.gif">lass="mathContainer hidden">lass="mathCode">ltimg="si105.gif" overflow="scroll">w>Bw>w>sw>w>0w> mass eigenstate. This is the first measurement of the effective lifetime in this decay mode.

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