Tracy McAskill
Lecturer in Physics
I like physics. I like math. I like teaching, and I am interested in methods that optimize the learning of physics.
My research is in particle physics, specifically weak production of mesons at midrange energies. My work falls into phenomenology, which bridges theory and experiment. I attempt to model exclusive production of neutral pions through weak charged and neutralcurrent interactions with nucleons. The use of the weak interactions with nucleons allows for the potential of flavor changing from the more easily probed up or down quarks to the more elusive strange or charm quarks. This can give insight into the intrinsic charm and strange content of nucleons. The use of neutral pseudoscalar mesons forces the quarks involved in the process to undergo a spin flip, which exposes what are known as the chiral odd general parton distributions. My daytoday research involves a lot of Feynman diagrams, Dirac algebra, and work with MAPLE mathematics software.
At Wellesley College, I have taught Physics 104, Physics 106, Physics 107, Physics 108, Physics 302, and the introductory labs. I would be delighted to teach upperlevel classical mechanics and electricity and magnetism at some point. I have also led independent studies in general relativity, special relativity, and introductory particle physics.
I like to think of teaching as story telling; if students can remember how the story starts (base concepts), they should be able to logically build the rest of the story from there. It is in this logical building that the how/what/why of the theory come out.
Students often feel that physics is scary or intimidating, and I try to dispel this by starting with the very basics, logically building the theory from there, and using language that is approachable. I have found that if students can remember the "rules" associated with a particular concept, they are very successful.
My other physics interests include general relativity, standard model physics, and spinors in general relativity.
My nonphysics interests revolve around movement. I am a contortionist and fitness enthusiast. I formerly performed as a freelance contortionist in greater New England and abroad. I also teach contortion, and I have a lot of knowledge about injury prevention and imbalance correction in flexible people.
Education
 B.S., Texas Tech University
 M.S., Tufts University
 Ph.D., Tufts University
Current and upcoming courses
Classical Dynamics
PHYS207
Newtonian mechanics is revisited using more sophisticated mathematical tools such as differential equations, linear algebra, and Fourier analysis. Topics include driven and coupled oscillators, central forces, and conservation laws. Particular attention is paid to wave phenomena and how the mathematics that describes mechanical waves can be extended to the realms of electromagnetism and quantum mechanics.

Particle Physics
PHYS332
This course explores aspects of relativistic quantum mechanics. Beginning with a review of special relativity and the foundations of quantum mechanics, two of the most fundamental equations in particle physics will be introduced: the KleinGordon equation and the Dirac equation. Students will also learn intrinsic properties of fundamental particles and how to represent these ideas through Feynman diagrams with the focus being on quantum electrodynamics and weak interactions. From there, a variety of topics will be explored, including Lagrangians, symmetry breaking, and the Higgs mechanism, as well as neutrinos and their current role in particle physics research. If time permits, concepts of field theory will be introduced. 
Newtonian mechanics governs the motion of objects ranging from biological cells to galaxies. The fundamental principles of mechanics allow us to begin to analyze and understand the physical world. In this introductory calculusbased course, we will systematically study the laws underlying how and why objects move, and develop analysis techniques for applying these laws to everyday situations. Broadly applicable problemsolving skills will be developed and stressed. Topics include forces, energy, momentum, rotations, gravity, and waves, and a wide range of applications. This course is taught in studiostyle, which blends lecture with group problem solving and handson experimental activities.