[Jlab-seminars] Fwd: Physics Colloquium - December 8, “Quantum interference in hydrogen spectroscopy and the proton charge radius puzzle"

[Mary Fox]

-------- Forwarded Message --------
Subject: 	Physics Colloquium - December 8, “Quantum interference in 
hydrogen spectroscopy and the proton charge radius puzzle"
Date: 	Mon, 4 Dec 2017 16:30:17 +0000
From: 	Wilkinson, Ellie V <evwilk at wm.edu>
To: 	physics2017 at physics.wm.edu <physics2017 at physics.wm.edu>
CC: 	undergrads2017 at physics.wm.edu <undergrads2017 at physics.wm.edu>



*_PHYSICS COLLOQUIUM_*

Friday, December 8, 2017

4:00 PM

Small Hall, Room 111

*Marko Horbatsch *[Host: K. Griffioen]**

York University, Toronto, Canada

* Title of Talk:  “Quantum interference in hydrogen spectroscopy and the 
proton charge radius puzzle”*

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*_Abstract:_*

For some years now the size of the proton charge radius has been in 
question. Atomic hydrogen spectroscopy was thought to be consistent with 
elastic electron-proton scattering determinations and yielding a radius 
of about 0.88 fm. The CREMA collaboration produced a 2S-2P Lamb shift 
measurement in muonic hydrogen (and later in muonic deuterium) from 
which the charge radius follows to have a value of 0.841 fm. This 
questions the accuracy of e-p scattering determinations of the charge 
radius.

I will describe a recent fluorescence measurement from Garching (T. 
Haensch group, Science 2017) in regular hydrogen for the 2S-4P 
intervals, which when corrected for quantum interference yields a result 
that is consistent with the muonic hydrogen determination of the proton 
charge radius. The role of quantum interference in spectroscopy is a 
phenomenon that is becoming more important as the demand of determining 
the center of the resonance as a tiny fraction of its width is attempted.

/Cookies & Coffee will be served in Small 122 at 3:30pm/

******

*Eleonor V. Wilkinson*

Administrative & Office Specialist

The College of William & Mary-Physics
Small Hall, Room 123
300 Ukrop Way
Williamsburg, VA 23185

Telephone: 757-221-3503

Fax: 757-221-3540

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