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Measurement of the lifetime
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Using a data set corresponding to an integrated luminosity of pan id="mmlsi2" class="mathmlsrc">pan class="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 fbp>−1p>pan>pan class="mathContainer hidden">pan class="mathCode">3p> fb−1p>pan>pan>pan>, collected by the LHCb experiment in pp   collisions at centre-of-mass energies of 7 and 8 TeV, the effective lifetime in the pan id="mmlsi1" class="mathmlsrc">pii=S0370269316305779&_rdoc=1&_issn=03702693&md5=eb9fe7373a0fa2f9e69955ed5d96d05a">View the MathML sourcepxl.gif" data-inlimgeid="1-s2.0-S0370269316305779-si1.gif">pt>View the MathML sourcep://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269316305779-si1.gif">pt>pan class="mathContainer hidden">pan class="mathCode">p>Bs0p>→J/ψηpan>pan>pan> decay mode, pan id="mmlsi33" class="mathmlsrc">pan class="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">τeffpan>pan class="mathContainer hidden">pan class="mathCode">τeffpan>pan>pan>, is measured to be
pan id="mmlsi5" class="mathmlsrc">pan class="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.pan>pan class="mathContainer hidden">pan class="mathCode">τeff=1.479±0.034 (stat)±0.011 (syst) ps.pan>pan>pan>p" src="/sd/blank.gif">
Assuming CP   conservation, pan id="mmlsi33" class="mathmlsrc">pan class="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">τeffpan>pan class="mathContainer hidden">pan class="mathCode">τeffpan>pan>pan> corresponds to the lifetime of the light pan id="mmlsi105" class="mathmlsrc">pii=S0370269316305779&_rdoc=1&_issn=03702693&md5=2e683e6a7f29bd499403821400614d11">View the MathML sourcepxl.gif" data-inlimgeid="1-s2.0-S0370269316305779-si105.gif">pt>View the MathML sourcep://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269316305779-si105.gif">pt>pan class="mathContainer hidden">pan class="mathCode">p>Bs0p>pan>pan>pan> mass eigenstate. This is the first measurement of the effective lifetime in this decay mode.

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