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Hydrogen spectroscopy brings a surprise in the search for a solution to a long-standing puzzle Oct 6, 2017 ... The radius of the proton is very small, about 1 fm (1 fm is 10−15 m), smaller than the radius of a hydrogen atom by a factor of 60,000. As a ... [ReadMore..]

### Solving The Proton Puzzle – Physics World

Why were physicists wrong about the size of the proton for so long? As Edwin Cartlidge explains, it is about bureaucracy and politics as much as physics Jun 19, 2021 ... Amazingly, a signal emerged. Clearly visible above the background, it indicated that the proton's radius is 0.84184 ± 0.00067 fm (where 1 fm = ... [ReadMore..]

### CODATA Value: Proton Rms Charge Radius

proton rms charge radius $r_{\rm p}$. Numerical value, 8.414 x 10-16 m. Standard uncertainty, 0.019 x 10-16 m. Relative standard uncertainty, 2.2 x 10-3. [ReadMore..]

### The Proton Radius Puzzle - Scientific American

Two experiments have come up with two wildly different values for the proton's radius. What's going on? Feb 1, 2014 ... After doing the experiment in 2006 and 2007, Bernauer required three years to analyze all the data—work for which he would earn his Ph.D. The ... [ReadMore..]

### Prediction Of Rms Charge Radius Of Proton Using Proton-proton Elastic ...

Apr 30, 2021 ... Using proton–proton elastic scattering data at TeV and squared four-momentum transfer 0.36 < -t < 0.76 (GeV/c)2 for 13 σBeam distance and ... [ReadMore..]

### The Mass Radius Of The Proton

The mass radius is a fundamental property of the proton that so far has not been determined from experiment. Here we show that the mass radius of the proton can be rigorously defined through the formfactor of the trace of the energy-momentum tensor (EMT) of QCD in the weak gravitational field approximation, as appropriate for this problem. We then demonstrate that the scale anomaly of QCD enables the extraction of the formfactor of the trace of the EMT from the data on threshold photoproduction of $J/ψ$ and $Υ$ quarkonia, and use the recent GlueX Collaboration data to extract the r.m.s. mass radius of the proton ${\rm R_m = 0.55 \pm 0.03 \ fm}$. The extracted mass radius is significantly smaller than the charge radius of the proton ${\rm R_C = 0.8409 \pm 0.0004 \ fm}$. We attribute this difference to the interplay of asymptotic freedom and spontaneous breaking of chiral symmetry in QCD, and outline future measurements needed to determine the mass radius more precisely. Here we show that the mass radius of the proton can be rigorously defined through the formfactor of the trace of the energy-momentum tensor (EMT) of QCD in ... [ReadMore..]

### New Measurement Yields Smaller Proton Radius | Jefferson Lab

Nov 6, 2019 ... Physicists get closer to solving the proton radius puzzle with unique new measurement of the charge radius of the proton. [ReadMore..]

### On The Rms-radius Of The Proton - ScienceDirect

We study the world data on elastic electron–proton scattering in order to determine the proton charge rms-radius. After accounting for the Coulomb dis… Dec 4, 2003 ... Abstract. We study the world data on elastic electron–proton scattering in order to determine the proton charge rms-radius. After accounting for ... [ReadMore..]

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### Physicists Finally Nail The Proton's Size, And Hope Dies | Quanta ...

A new measurement appears to have eliminated an anomaly that had captivated physicists for nearly a decade. Sep 11, 2019 ... Finally, the results are in: Hessels and company have pegged the proton's radius at 0.833 femtometers, give or take 0.01, a measurement exactly ... [ReadMore..]

### Proton Radius Puzzle May Be Solved

A mystery nearly a decade long could have challenged the standard model. But two different techniques now confirm a consistent value for the proton radius. Nov 6, 2019 ... The Lamb shift for muonic hydrogen is thus much larger and easier to measure with a lower uncertainty. Pohl's team measured a proton radius of ... [ReadMore..]