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<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">From UGlasgow Physics. This coincides with the colloquium we are having this week by Prof Katarina Lorenz.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Sonja Franke-Arnold [mailto:Sonja.Franke-Arnold@glasgow.ac.uk]
<br>
<b>Sent:</b> 19 January 2015 15:58<br>
<b>To:</b> phas-staff@glasgow.ac.uk; phas-pgall@glasgow.ac.uk; phas-hon-staff@glasgow.ac.uk<br>
<b>Cc:</b> Daniel Oi<br>
<b>Subject:</b> Colloquium Wd 21/1 at 3pm; Dr Chamkaur Ghag , "Direct dark matter detection with the LUX and LZ experiments "<o:p></o:p></span></p>
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<p><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black">Dear All,
<br>
please note this week's colloquium:<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"><br>
speaker: <strong><span style="font-family:"Tahoma",sans-serif">Dr Chamkaur Ghag </span>
</strong>(University College London)<br>
title: <strong><span style="font-family:"Tahoma",sans-serif">Direct dark matter detection with the LUX and LZ experiments</span></strong> (abstract underneath)<br>
date: 21/1/15 <br>
time: 3pm to 4pm, followed by coffee and doughnuts<br>
place: Kelvin Building, room 222<br>
<br>
Best wishes, <br>
Sonja<br>
<br>
____________<o:p></o:p></span></p>
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<p><span lang="EN-US" style="font-family:"Times",serif;color:black">Discovery of the nature of dark matter is internationally recognised as one of the greatest contemporary challenges in science, fundamental to our understanding of the Universe. The most compelling
candidates for dark matter are Weakly Interacting Massive Particles (WIMPs) that arise naturally in several models of physics beyond the Standard Model. The discovery of galactic WIMPs would therefore enlighten two of the outstanding problems of modern physics
- the matter composition of the Universe and the extrapolation of the Standard Model of particle physics to GUT scales. Although no definitive signal has yet been discovered, the worldwide race towards direct detection has been dramatically accelerated by
the remarkable progress and evolution of liquid xenon (LXe) time projection chambers (TPCs). They have shifted the scale of target mass by orders of magnitude whilst simultaneously reducing backgrounds to unprecedented low levels, becoming the leaders of the
field and offering the most promising prospects for a first definitive detection.</span><span lang="EN-US" style="font-family:"Times",serif;color:black">
<o:p></o:p></span></p>
<p class="default" style="margin-bottom:12.0pt"><span lang="EN-US" style="font-family:"Times",serif;color:black">I will present on the current status in the worldwide hunt for WIMPs, and focus on the LXe TPC based LUX experiment, operated in the Davis Cavern
of the SURF laboratory, USA, that announced results from it's first science run last year. From an exposure of 85 days, having found no evidence of signal above expected background, LUX has set constraints on scalar WIMP-nucleon interactions above 7.6x10<sup>-46</sup></span><span lang="DA" style="font-family:"Times",serif;color:black">
cm<sup>2</sup> at 33 GeV/c</span><sup><span lang="EN-US" style="font-family:"Times",serif;color:black">2</span></sup><span lang="EN-US" style="font-family:"Times",serif;color:black"> WIMP mass (90% C.L.) - three times more sensitive than any competing experiment.
This first result also seriously challenges the interpretation of hints of signal detected in other experiments as arising from low-mass WIMPs. Finally, I will report on the multi-tonne successor to LUX: the LZ experiment. This instrument will have sensitivity
ideally matched to explore the bulk of the remaining theoretically favoured electroweak phase space towards galactic Dark Matter discovery.</span><span lang="EN-US" style="font-family:"Times",serif;color:black"><o:p></o:p></span></p>
<p><span style="color:black"> <o:p></o:p></span></p>
<p><span style="color:black"> <o:p></o:p></span></p>
<p><span style="font-size:14.0pt;font-family:"Cambria",serif;color:black">Professor Chris Collins</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:14.0pt;font-family:"Cambria",serif;color:black">Astrophysics Research Institute</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:14.0pt;font-family:"Cambria",serif;color:black">Liverpool John Moores University</span><span style="color:black"><o:p></o:p></span></p>
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