Using a data set corresponding to an integrated luminosity of mmlsi2" class="mathmlsrc">mulatext 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−1mathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll"><mn>3mn><msup><mrow><mtext> fbmtext>mrow><mrow><mo>−mo><mn>1mn>mrow>msup>math>, collected by the LHCb experiment in m>pp m> collisions at centre-of-mass energies of 7 and 8 TeV, the effective lifetime in the mmlsi1" class="mathmlsrc">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">mg class="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">mathContainer hidden">mathCode"><math altimg="si1.gif" overflow="scroll"><msubsup><mrow><mi>Bmi>mrow><mrow><mi>smi>mrow><mrow><mn>0mn>mrow>msubsup><mo stretchy="false">→mo><mi>Jmi><mo stretchy="false">/mo><mi>ψmi><mi>ηmi>math> decay mode, mmlsi33" class="mathmlsrc">mulatext 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">τeffmathContainer hidden">mathCode"><math altimg="si33.gif" overflow="scroll"><msub><mrow><mi>τmi>mrow><mrow><mi mathvariant="normal">effmi>mrow>msub>math>, is measured to be