STAR HardProbes PWG

["Ma, Rongrong" <marr AT bnl.gov>]

Hello Barbara

To elaborate a bit more on this. The R_AA values that Ziyang uses to convert to yields include only AuAu uncertainties, which is why we can use this method. The pp uncertainties are treated as global. 

Thanks. 

Best

Rongrong

On Jun 1, 2023, at 12:28 PM, zli1 via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Dear Barbara,

Thank you for your comments.

Indeed, we derive the yields from R_AA. This is because we directly combined R_AA from both channels beforehand, and as a result, deriving the yields from the combined R_AA was a straightforward method for us.

Regarding your concern about the treatment of uncertainties, these are handled using a simple error propagation principle, given that we are only multiplying R_AA by some constants. The systematic uncertainties include signal extraction, tracking, and particle identification (PID) uncertainties, and they do not incorporate any global uncertainties.

Best,
Ziyang

On 2023-06-01 18:57, Barbara Trzeciak wrote:

Hi Ziyang,
thanks for this update.
Regarding the inv. yields that you show on slide 13, why do you derive
the from RAA not directly from the corrected yields measured in Au+Au
in both channels ?
It looks like a way around. Though it's also fine, depending on how
you treat the uncertainties which I'm not sure about from the
statement "uncertainties based on RAA".
Could you please provide more details ?
Cheers,
Barbara