Measurement of the lifetime
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Using a data set corresponding to an integrated luminosity of ource">3 fb&minus;1, collected by the LHCb experiment in pp   collisions at centre-of-mass energies of 7 and 8 TeV, the effective lifetime in the ource" 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">View the MathML s<font color=ource" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316305779-si1.gif"> decay mode, ource">τeff, is measured to be
ource">τeff=1.479±0.034 (stat)±0.011 (syst) ps.
Assuming CP   conservation, ource">τeff corresponds to the lifetime of the light ource" 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">View the MathML s<font color=ource" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316305779-si105.gif"> mass eigenstate. This is the first measurement of the effective lifetime in this decay mode.

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