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The Moedal Experiment at the LHC. Searching Beyond the Standard 126 EPJ Web of Conferences , 02024 (2016) DOI: 10.1051/epjconf/201612602024 ICNFP 2015 The MoEDAL experiment at the LHC Searching beyond the standard model James L. Pinfold (for the MoEDAL Collaboration)1,a 1 University of Alberta, Physics Department, Edmonton, Alberta T6G 0V1, Canada Abstract. MoEDAL is a pioneering experiment designed to search for highly ionizing avatars of new physics such as magnetic monopoles or massive (pseudo-)stable charged particles. Its groundbreaking physics program defines a number of scenarios that yield potentially revolutionary insights into such foundational questions as: are there extra dimensions or new symmetries; what is the mechanism for the generation of mass; does magnetic charge exist; what is the nature of dark matter; and, how did the big-bang develop. MoEDAL’s purpose is to meet such far-reaching challenges at the frontier of the field. The innovative MoEDAL detector employs unconventional methodologies tuned to the prospect of discovery physics. The largely passive MoEDAL detector, deployed at Point 8 on the LHC ring, has a dual nature. First, it acts like a giant camera, comprised of nuclear track detectors - analyzed offline by ultra fast scanning microscopes - sensitive only to new physics. Second, it is uniquely able to trap the particle messengers of physics beyond the Standard Model for further study. MoEDAL’s radiation environment is monitored by a state-of-the-art real-time TimePix pixel detector array. A new MoEDAL sub-detector to extend MoEDAL’s reach to millicharged, minimally ionizing, particles (MMIPs) is under study Finally we shall describe the next step for MoEDAL called Cosmic MoEDAL, where we define a very large high altitude array to take the search for highly ionizing avatars of new physics to higher masses that are available from the cosmos. 1 Introduction In 2010 the MoEDAL experiment [1] at the Large Hadron Collider (LHC) was unanimously approved by CERN’s Research Board to start data taking in 2015. MoEDAL is a pioneering experiment de- signed to search for highly ionizing avatars of new physics such as magnetic monopoles or massive (pseudo-)stable charged particles. Its groundbreaking physics program defines over 30 scenarios that yield potentially revolutionary insights into such foundational questions as: are there extra dimen- sions or new symmetries; what is the mechanism for the generation of mass; does magnetic charge exist; what is the nature of dark matter; and, how did the big-bang develop. The LHC machine [2] brings its counter rotating beams nominally consisting of 2808 bunches of protons each with roughly 1011 protons per bunch. The proton beams are brought into collision at four points around the 27 km circumference LHC ring. The biggest of the LHC’s seven experiments are ATLAS [3] and CMS [4], general-purpose detectors designed to investigate the largest range of physics possible. ALICE [5] ae-mail: [email protected] © The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/). 126 EPJ Web of Conferences , 02024 (2016) DOI: 10.1051/epjconf/201612602024 ICNFP 2015 and LHCb [6] have detectors specialized for focussing on specific phenomena such as quark–gluon plasma formation and the investigation of the matter-antimatter asymmetry using b-hadron physics, respectively. These four detectors in huge caverns sit roughly 100m underground on the LHC ring. Prior to the approval of the MoEDAL experiment the smallest experiments on the LHC were TOTEM [7] and LHCf [8], which focus on "forward particles" – protons or heavy ions that brush past each other rather than meeting head on when the beams collide. TOTEM uses detectors positioned on ei- ther side of the CMS interaction point, while LHCf is made up of two detectors that sit along the LHC beam line, at 140 metres either side of the ATLAS collision point. MoEDAL the seventh and latest LHC experiment shares an interaction point with the LHCb experiment. It is designed to significantly expand the discovery horizon of the general-purpose LHC detectors, ATLAS and CMS in a comple- mentary manner. The innovative MoEDAL detector employs unconventional methodologies tuned to the prospect of discovery physics. The largely passive MoEDAL detector, deployed at Point 8 on the LHC ring has a dual nature. First, it acts like a giant camera, comprised of Nuclear Track Detectors (NTDs) - analyzed offline by ultra fast scanning microscopes - sensitive only to new physics. Second, it is uniquely able to trap the particle messengers of physics beyond the Standard Model for further study. MoEDAL’s radiation environment is monitored by a state-of-the-art real-time TimePix pixel detector array. In addition, we are preparing a proposal for a third active detector element capable of detecting the faintest flicker of light - single photon signals - produced by the passage of Minimally Ionizing (millicharged) Particles (mQPs) with charge as small as one thousandth that of an electron. 2 Highly ionzing particles - messengers of new physics MoEDAL’s groundbreaking physics prospectus [9] covers 34 fundamentally important Beyond the Standard Model (BSM) scenarios involving electrically and magnetically charged particles. It is de- signed to exploit the use of Highly Ionizing Particles (HIPs) as wide ranging avatars of new physics. One of the main objectives for MoEDAL is the state-of-the-art search for the magnetic charge car- ried by the monopole, just as the search for the Higgs was the prime motivation for the LHC and its general-purpose experiments. To be detected a particle must interact with the material of the detector losing energy as they travel. Except when they are moving very near to the speed of light charged particles heavier than electrons primarily lose energy by interacting with the atoms of the material by exciting atomic electrons or ionizing atoms. The Bethe formula describes the energy loss per distance travelled of fast charged particles that are more massive than electrons such as muons, protons, pions and ions (atomic nuclei). A simplified form of the Bethe equation is: dE KZ 1 2meβ2γ2 − = z2 ln − β2 (1) dx Aβ2 2 I2 where, β is the speed of the particles expressed as a fraction of the speed of light (β=v/c) and K = 2 2 4πNAre mec . The properties of the medium are the atomic number Z, the atomic mass A and the mean excitation energy I. The constants are the electron mass, me, the classical electron radius, re and Avogardo’s number NA. All stable or long-lived Standard Model charged particles produced in proton-proton collisions at the LHC have a single charge (ze → e), are relatively light i.e. at most the mass of a proton and are moving near to the speed of light (β ∼ 1). Particle are “minimum ionizing” (MIPs) if βγ = 3 → 4 (or dE/dx ∼ 1→2 MeV g−1 cm2). In proton-proton collisions as the LHC electrically charged particles can only be highly ionizing if they are massive and thus moving very slowly with βγ <1, and/or multiply charged. However, there 2 126 EPJ Web of Conferences , 02024 (2016) DOI: 10.1051/epjconf/201612602024 ICNFP 2015 are no known massive stable or long-lived particles that are multiply charged. The only way that a Standard Model particle can be highly ionizing is if it is slowing down to stop. Energy loss due to ionization by mQP is described by the Bethe-Bloch formula. Thus, all other things being equal a milli-charged particle ( with q = 0.001e) will ionize 10−6 aless than a singly charged particle (with q=1e) and multiple detection coincidence can rule out detector related backgrounds. Thus, massive stable or pseudo-stable HIPs or mQps traversing the detector are clear messengers of new physics with no obvious Standard Model Backgrounds. 2.1 Particles with magnetic charge A prime example of a HIP from BSM is the magnetic monopole. The ionization energy loss of a magnetically charged particle can be obtained from the Bethe formula by replacing the electric charge ze by ngβ where g is the magnetic charge and n is the number of Dirac magnetic charges and realizing that for magnetic monopoles the velocity dependence of the Lorentz force cancels the 1/β2 term in the Bethe-Bloch formula for charged particles: dE KZ 1 2meβ2γ2 − = n(g/e)2 ln − β2 (2) dx A 2 I2 A single Dirac (magnetic) charge is g ≈ 68.5e. As we can see from the Bethe formula for magnetic charge given above, the energy loss of a singly charged (n = 1) very relativistic magnetic monopole (β ≈ 1) is amazingly about 4700 times that of a proton. The MoEDAL experiment detects HIPs using stacks of passive plastic Nuclear Track Detectors (NTDs). The HIP damages the plastic as it traverses the NTD stack. Etching the plastic in a hot sodium hydroxide solution can reveal this damage as two collinear etch-pits each with diameter ∼ 5- 10μm in each of the six layers of the stack. The NTD plastic employed by MoEDAL has a threshold of around Z/β of 5 (or 5 MIPs) where Z is the charge number of the particle and β is the velocity of the particle divided by the speed of light (v/c). A HIP messenger of new physics would leave a tell tale signature of twelve tiny etch pits (for each stack of ten NTD sheets) forming a precisely defined line pointing back to the collision. There is no known Standard Model particle that can give a trail of collinear etch pits in a MoEDAL stack. 3 Directly detecting magnetic charge Clearly, a unique property of the magnetic monopole is that it has magnetic charge.
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