[PRad] [EXTERNAL] Re: A new exclusion limit

gasparan at jlab.org gasparan at jlab.org
Mon Jul 31 12:59:29 EDT 2023

  Hi Rafo and All,

 There are several things that we have to take the NA64 results very
 carefully: (a) if I am not wrong, there exclusion plot does not have
 the epsilon parameter directly on the y-axis. One needs to recalculate
 it (needs to be checked). (b) they have an assumption that the A' is
 invisible in the first colorimeter (Rafo's point below). (c) another
 assumption that they are able to resolve two EM showers within a 1 mm
 distance needs a serious scrutiny.


> Hi Tyler,
> I agree, it should be complementary.
> In their search they assumed the invisible decay: A'->χχ decay, so this
> exclusion, doesn't exclude existence of an A' with an epsilon within our
> range that decays visibly.
> Rafo
> ________________________________
> From: Tyler Hague <tjhague at lbl.gov>
> Sent: Saturday, July 29, 2023 12:59 PM
> To: Rafayel Paremuzyan <rafopar at jlab.org>
> Cc: prad at jlab.org <prad at jlab.org>
> Subject: [EXTERNAL] Re: [PRad] A new exclusion limit
> Hi Rafo,
> Thanks for sending this around. It looks like their exclusion limit fully
> contains our experiment. Our experiment should still be considered
> complementary though given that we are not using a missing mass method. It
> may be useful for us to consider putting more emphasis on our sensitivity
> to neutrals though, given this.
> Best,
> Tyler
> On Fri, Jul 21, 2023 at 8:46 AM Rafayel Paremuzyan via PRad
> <prad at jlab.org<mailto:prad at jlab.org>> wrote:
> Hello all,
> here is the new paper (still in the Arxiv) that reports a huge new
> exclusion limit
> https://arxiv.org/abs/2307.02404<https://urldefense.proofpoint.com/v2/url?u=https-3A__arxiv.org_abs_2307.02404&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=RRU0wYsm58ED2zDanQADbuRK_U7eVkqEBSro5m4kcEU&m=N6yqKdH2RafM6bZF9WASbyyfK2-wYrUNKd-LNTfUcPW-9IlBT3m9x1G8BoVioubG&s=9TaytDE0SKBhJBhCKPzqCvmzgi0joILsQxra3PmftRE&e=>
> Rafo
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