[Hps] 2015 Vertex Analysis Note Rough Draft

Sat Jun 30 17:48:09 EDT 2018

Hi all,

Attached is the rough draft of the Vertex Analysis Note for the 2015 1.05 GeV data with the SVT at 0.5 mm. Special thanks to Holly, Matt Graham, Sho, and the rest of the Vertex Analysis Group for making this possible. Please send comments to us if you have any. I will be presenting these results at ICHEP on Friday, July 6.

Below is the summary of the results:

Final data sample with zcut in red:

[https://urldefense.proofpoint.com/v2/url?u=https-3A__lh4.googleusercontent.com_zNHIP-5FPJ5X53fCfjqHn1C3tkE78LWDEaiWN8ZKPubabh5K-2D563fLiqyJTMU8fSiZ7-2D-5FinWeKzAf-5F09oXsSzI8XJvseXlkdMzq635LpZL7db8PUDCEfO6Sx4kJYzenKz6bJv096SVsA&d=DwIFAw&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=hGEVsUzUB5ml8iDt6EuOdg&m=V1ZA5OLbLcfqgUAesQafYfpom0wSsQIWLzu-j3KRz-c&s=8gTCLolXtmgyFj-HVGV7-xpozHW3rqo3-fJI5rnsOpg&e= ]

Number of A' events we expect to detect past zcut (peak at ~0.1 expected events):

[https://urldefense.proofpoint.com/v2/url?u=https-3A__lh3.googleusercontent.com_AqWfynfi7eML39KDs9tOaiqncHIs5zYPjKnu3XwAwQHaMy06afSFCqAwaxNJpFs4v2lJDMpx3bQ8FDAtoy2MpjrqDQPR5CKzwHzQ5DUi1dZPdkPNCrasa3rB4GkJ7YjUbbbSVXU8Ng&d=DwIFAw&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=hGEVsUzUB5ml8iDt6EuOdg&m=V1ZA5OLbLcfqgUAesQafYfpom0wSsQIWLzu-j3KRz-c&s=G7-7hilQBJ--mAmal5cmtI2Mh7pbzg_J4QkHFvO5tyo&e= ]

Limit using the Optimum Interval Method (value of 1 means 90% confidence of exclusion). Minimum is at 36, which means we just barely begin to exclude at the 90% confidence level an A' - like object with 36 times the cross section:

[https://urldefense.proofpoint.com/v2/url?u=https-3A__lh5.googleusercontent.com_qYotiZ0CQ8zL8fuKCteZZIwHAvRvlGo4D7EKReZsigCuawJoParcoMxrZDTbjVdNOjU-5FN-2DOfoAf6XJe1tj8nylUfZRjaEftwKMkCvGvVkqy2xaueNhyjzPGU7kK8q6b-2DCMAogIniVQ&d=DwIFAw&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=hGEVsUzUB5ml8iDt6EuOdg&m=V1ZA5OLbLcfqgUAesQafYfpom0wSsQIWLzu-j3KRz-c&s=71Ae1lTkL03ykA8DMLBJhOHabhQd8XJX9zRsL6xEEzY&e= ]

Thanks.

Matt Solt
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