Precision measurement of the ratio of the to lifetimes
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The LHCb measurement of the lifetime ratio of the mmlsi1" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269314003232&_mathId=si1.gif&_user=111111111&_pii=S0370269314003232&_rdoc=1&_issn=03702693&md5=c655beeaa08faa060a8ca257c266baec">mg class="imgLazyJSB inlineImage" height="18" width="18" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269314003232-si1.gif">mathContainer hidden">mathCode"><math altimg="si1.gif" overflow="scroll"><msubsup><mrow><mi>螞mi>mrow><mrow><mi>bmi>mrow><mrow><mn>0mn>mrow>msubsup>math> baryon to the mmlsi2" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269314003232&_mathId=si2.gif&_user=111111111&_pii=S0370269314003232&_rdoc=1&_issn=03702693&md5=0b99828119809b542144111ec9de7def">mg class="imgLazyJSB inlineImage" height="13" width="17" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269314003232-si2.gif">mathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll"><msup><mrow><mover accent="true"><mi>Bmi><mo>&macr;mo>mover>mrow><mrow><mn>0mn>mrow>msup>math> meson is updated using data corresponding to an integrated luminosity of 3.0 fb&minus;1 collected using 7 and 8 TeV centre-of-mass energy m>pp  m> collisions at the LHC. The decay modes used are mmlsi3" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269314003232&_mathId=si3.gif&_user=111111111&_pii=S0370269314003232&_rdoc=1&_issn=03702693&md5=515550d5adde13167d04f6c263e0c4af">mg class="imgLazyJSB inlineImage" height="19" width="95" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269314003232-si3.gif">mathContainer hidden">mathCode"><math altimg="si3.gif" overflow="scroll"><msubsup><mrow><mi>螞mi>mrow><mrow><mi>bmi>mrow><mrow><mn>0mn>mrow>msubsup><mo stretchy="false">→mo><mi>Jmi><mo stretchy="false">/mo><mi>蠄mi><mi>pmi><msup><mrow><mi>Kmi>mrow><mrow><mo>&minus;mo>mrow>msup>math> and mmlsi4" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269314003232&_mathId=si4.gif&_user=111111111&_pii=S0370269314003232&_rdoc=1&_issn=03702693&md5=6dc3e442a3f9f72cc5d3e5d90e3654f8">mg class="imgLazyJSB inlineImage" height="16" width="105" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269314003232-si4.gif">mathContainer hidden">mathCode"><math altimg="si4.gif" overflow="scroll"><msup><mrow><mover accent="true"><mi>Bmi><mo>&macr;mo>mover>mrow><mrow><mn>0mn>mrow>msup><mo stretchy="false">→mo><mi>Jmi><mo stretchy="false">/mo><mi>蠄mi><msup><mrow><mi>蟺mi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>Kmi>mrow><mrow><mo>&minus;mo>mrow>msup>math>, where the mmlsi5" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269314003232&_mathId=si5.gif&_user=111111111&_pii=S0370269314003232&_rdoc=1&_issn=03702693&md5=89c7826734d7f34be743c0c9ba60b77f" title="Click to view the MathML source">蟺+K&minus;mathContainer hidden">mathCode"><math altimg="si5.gif" overflow="scroll"><msup><mrow><mi>蟺mi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>Kmi>mrow><mrow><mo>&minus;mo>mrow>msup>math> mass is consistent with that of the mmlsi6" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269314003232&_mathId=si6.gif&_user=111111111&_pii=S0370269314003232&_rdoc=1&_issn=03702693&md5=b7019f307afce4a1e0490ab94ea60f9e">mg class="imgLazyJSB inlineImage" height="16" width="56" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269314003232-si6.gif">mathContainer hidden">mathCode"><math altimg="si6.gif" overflow="scroll"><msup><mrow><mover accent="true"><mi>Kmi><mo>&macr;mo>mover>mrow><mrow><mo>鈦?/mo><mn>0mn>mrow>msup><mo stretchy="false">(mo><mn>892mn><mo stretchy="false">)mo>math> meson. The lifetime ratio is determined with unprecedented precision to be mmlsi7" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269314003232&_mathId=si7.gif&_user=111111111&_pii=S0370269314003232&_rdoc=1&_issn=03702693&md5=da8b6de480debaa5ad305b97c2a38f5a" title="Click to view the MathML source">0.974&plusmn;0.006&plusmn;0.004mathContainer hidden">mathCode"><math altimg="si7.gif" overflow="scroll"><mn>0.974mn><mo>&plusmn;mo><mn>0.006mn><mo>&plusmn;mo><mn>0.004mn>math>, where the first uncertainty is statistical and the second systematic. This result is in agreement with original theoretical predictions based on the heavy quark expansion. Using the current world average of the mmlsi2" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269314003232&_mathId=si2.gif&_user=111111111&_pii=S0370269314003232&_rdoc=1&_issn=03702693&md5=0b99828119809b542144111ec9de7def">mg class="imgLazyJSB inlineImage" height="13" width="17" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269314003232-si2.gif">mathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll"><msup><mrow><mover accent="true"><mi>Bmi><mo>&macr;mo>mover>mrow><mrow><mn>0mn>mrow>msup>math> lifetime, the mmlsi8" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269314003232&_mathId=si8.gif&_user=111111111&_pii=S0370269314003232&_rdoc=1&_issn=03702693&md5=678caf5a6a9e0f8ff22af32a6434d5a0">mg class="imgLazyJSB inlineImage" height="18" width="18" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269314003232-si8.gif">mathContainer hidden">mathCode"><math altimg="si8.gif" overflow="scroll"><msubsup><mrow><mi>螞mi>mrow><mrow><mi>bmi>mrow><mrow><mn>0mn>mrow>msubsup>math> lifetime is found to be mmlsi9" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269314003232&_mathId=si9.gif&_user=111111111&_pii=S0370269314003232&_rdoc=1&_issn=03702693&md5=1c51ed31fa23cfe35bda39b1676bd89b" title="Click to view the MathML source">1.479&plusmn;0.009&plusmn;0.010 psmathContainer hidden">mathCode"><math altimg="si9.gif" overflow="scroll"><mn>1.479mn><mo>&plusmn;mo><mn>0.009mn><mo>&plusmn;mo><mn>0.010mn><mtext> mtext><mtext>psmtext>math>.

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