Measurement of the lifetime
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Using a data set corresponding to an integrated luminosity of <span id="mmlsi2" class="mathmlsrc"><span 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 fb<sup>&minus;1sup>span><span class="mathContainer hidden"><span class="mathCode"><math altimg="si2.gif" overflow="scroll"><mn>3mn><msup><mrow><mtext> fbmtext>mrow><mrow><mo>&minus;mo><mn>1mn>mrow>msup>math>span>span>span>, 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 <span id="mmlsi1" class="mathmlsrc">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">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">script>mg height="17" border="0" style="vertical-align:bottom" width="74" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269316305779-si1.gif">script><span class="mathContainer hidden"><span class="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>span>span>span> decay mode, <span id="mmlsi33" class="mathmlsrc"><span 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">τ<sub>effsub>span><span class="mathContainer hidden"><span class="mathCode"><math altimg="si33.gif" overflow="scroll"><msub><mrow><mi>τmi>mrow><mrow><mi mathvariant="normal">effmi>mrow>msub>math>span>span>span>, is measured to be
ss="formula" id="fm0010">
ss="mathml"><span id="mmlsi5" class="mathmlsrc"><span 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">τ<sub>effsub>=1.479&plusmn;0.034 (stat)&plusmn;0.011 (syst) ps.span><span class="mathContainer hidden"><span class="mathCode"><math altimg="si5.gif" overflow="scroll"><msub><mrow><mi>τmi>mrow><mrow><mi mathvariant="normal">effmi>mrow>msub><mo>=mo><mn>1.479mn><mo>&plusmn;mo><mn>0.034mn><mtext> (stat)mtext><mo>&plusmn;mo><mn>0.011mn><mtext> (syst)mtext><mtext> psmtext><mo>.mo>math>span>span>span>mg class="temp" src="/sd/blank.gif">
Assuming m>CP  m> conservation, <span id="mmlsi33" class="mathmlsrc"><span 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">τ<sub>effsub>span><span class="mathContainer hidden"><span class="mathCode"><math altimg="si33.gif" overflow="scroll"><msub><mrow><mi>τmi>mrow><mrow><mi mathvariant="normal">effmi>mrow>msub>math>span>span>span> corresponds to the lifetime of the light <span id="mmlsi105" class="mathmlsrc">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">mg class="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">script>mg height="17" border="0" style="vertical-align:bottom" width="17" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269316305779-si105.gif">script><span class="mathContainer hidden"><span class="mathCode"><math altimg="si105.gif" overflow="scroll"><msubsup><mrow><mi>Bmi>mrow><mrow><mi>smi>mrow><mrow><mn>0mn>mrow>msubsup>math>span>span>span> mass eigenstate. This is the first measurement of the effective lifetime in this decay mode.

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