by Dr Felix Kling (SLAC)

CTPU Seminar Room

CTPU Seminar Room

Fourth floor IBS Building, 55, Expo-ro, Yuseong-gu, Daejeon, Korea, 34126

IBS-CTPU will be hosting Felix Kling (SLAC), of the recently approved ForwArd Search ExpeRiment (FASER) at CERN, for a series of talks. These talks will occur over two days, beginning with a broad outline of the FASER experiment and then detail its discovery potential for a variety of light, weakly-interacting particles, including prospects for the detection of collider neutrinos in the sub-detector FASERν. We invite interested members of the theoretical/experimental particle physics community to join us and participate in a fruitful discussion of the possibilities associated with this exciting new experiment.

Notification for visitors : The IBS has taken preventive measures against nCoV, especially for visitors. Please note the following information before visiting the IBS.  

1) In the main entrance, the staff of the IBS will measure the visitor’s temperature via a contactless thermometer. In the case of body temperature equal to or greater than 37.5℃, the visitors will not be allowed to enter the IBS. 

2) The IBS staff also will ask to complete a (one page) questionnaire with questions such as whether or not the visitor visited China (Hong Kong, Macao, Singapore, Japan, Vietnam, Thailand, Taipei) within 14 days, and whether or not the visitor had a fever (37.5℃ or above) and respiratory symptoms (e.g. coughs, sore throats, etc.) recently. It won’t take much time if there is no suspicious symptom. However please note that if the visitor visited China within 14 days, he/she cannot enter the IBS building. 

Wed. 02/19 (2 PM - 3 PM): The FASER Experiment

Physics searches and measurements at high-energy collider experiments traditionally focus on the high-pT region.  However, if particles are light and weakly-coupled, this focus may be completely misguided: light particles are typically highly collimated around the beam line, allowing sensitive searches with small detectors, and even extremely weakly-coupled particles may be produced in large numbers there.  Our recently approved experiment, the ForwArd Search ExpeRiment, or FASER, will be placed downstream of the ATLAS interaction point in the unused service tunnel TI12 to operate concurrently with the LHC. In this location, it will search for new particles and record neutrino interactions with TeV energies.  In this talk, I will outline the idea behind FASER, describe the detector location, layout, components and timeline, and discuss backgrounds at the FASER location. 


Wed. 02/19 (3:30 PM - 4:30 PM): Looking forward to new Physics at FASER

The approved FASER experiment will complement the LHC's existing physics program by extending its discovery potential to a host of new light, extremely weakly interacting particles.  Such particles may be produced in the LHC's high-energy collisions in large numbers in the far-forward region and may decay to visible particles in FASER, which is placed 480 m downstream of the ATLAS interaction point.  In this talk, I will present the sensitivity reach for FASER, as well as it's follow-up FASER 2, for a variety of long-lived particle models, including dark photons, dark Higgs bosons, heavy neutral leptons, axion-like particles and inelastic dark matter.  I will discuss how this reach can be further extended by considering additional secondary production of long-lived particles right in front of the detector.


Thur. 02/20 (2 PM - 3 PM): Detecting and Studying High-Energy Collider Neutrinos at FASERv

Neutrinos are copiously produced at particle colliders, but no collider neutrino has ever been detected.  FASERv, a recently approved subdetector of FASER, is designed to detect such collider neutrinos for the first time and study their properties. In this talk, I will show that the small and inexpensive emulsion detector will be able to detect thousands of neutrino interactions with TeV energies.  I will then discuss how FASERv will measure neutrino cross sections at energies where they are currently unconstrained, will bound models of forward particle production, and could open a new window on physics beyond the standard model.

FASER References:
Idea [arXiv:1708.09389]
Physics Case [arXiv:1811.12522]
Letter of Intent [arXiv:1811.10243]
Technical Proposal [arXiv:1812.09139]

FASERv References:
Idea/Letter of Intent [arXiv:1908.02310]
Technical Proposal