Precision Luminosity of LHC Proton–Proton Collisions at 13 TeV Using Hit Counting With TPX Pixel Devices

Sopczak, A.; Ali, B.; Asawatavonvanich, T.; Begera, Jakub; Bergmann, B.; Billoud, T. R. V.; Burian, Petr; Caicedo, I.; Caforio, D.; Heijne, E.H.M.; Janecek, J.; Leroy, C.; Mánek, Petr; Mochizuki, K.; Mora, Y.; Pacik, Josef; Papadatos, C.; Platkevič, Michal; Polansky, Stepan; Pospı́šil, S.; Suk, M.; Svoboda, Zdeněk

doi:10.1109/tns.2017.2664664

Cited by 15 publications

(63 citation statements)

References 13 publications

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“…Table I lists the locations of the 13 devices and their numbers of registered passing particles (clusters), normalized to 100% acquisition time. It was noted that the number of clusters for the 500 μm sensor is about 20% larger compared with that of the 300 μm sensor [5]. This Fig.…”

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confidence: 70%

“…The devices TPX01 to TPX16 are indicated as T1 to T16. explored hit-counting luminosity [5] and would constitute an important advancement in the overall LHC luminosity determination. The neutron counting capabilities in the ATLAS cavern at CERN are unique to the TPX detector network.…”

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confidence: 99%

“…ONLY DEVICES OPERATED FOR CLUSTER COUNTING THROUGHOUT THE YEAR 2015 ARE USED FOR THE HB (THERMAL NEUTRON) ANALYSIS, AS INDICATED. * REJECTED DURING ANALYSIS BECAUSE OF A TOO SMALL COUNT RATE doubles the measurement statistics and allows one to determine the precision and long-term time stability of individual TPX devices [5]. The dead time caused by the readout was reduced from about 6 s to 0.12 s allowing a much higher data acquisition rate.…”

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confidence: 99%

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Determination of Luminosity With Thermal Neutron Counting Using TPX Detectors in the ATLAS Cavern in LHC Proton-Proton Collisions at 13 TeV

Sopczak

Ali

Begera

et al. 2018

IEEE Trans. Nucl. Sci.

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A network of Timepix (TPX) devices installed in the ATLAS cavern has the unique capability of measuring the luminosity with thermal neutron counting in Large Hadron Collider proton-proton collisions at 13 TeV. Compared with the hit-counting method, the method of thermal neutron counting has the advantage that it is not affected by induced radioactivity. The results of the luminosity determination are presented for several independently operated TPX detectors. The long-term time stability measurements of the luminosity are presented for individual devices and between different devices. The highstatistics data sets allow a detailed comparison between neutron counting and hit-counting luminosity determinations.

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confidence: 70%

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confidence: 99%

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confidence: 99%

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Determination of Luminosity With Thermal Neutron Counting Using TPX Detectors in the ATLAS Cavern in LHC Proton-Proton Collisions at 13 TeV

Sopczak

Ali

Begera

et al. 2018

IEEE Trans. Nucl. Sci.

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“…Precision luminosity measurements are of particular importance for many analyses in high-energy physics. Networks of hybrid active pixel detectors from the Medipix/Timepix family [1] installed in ATLAS cavern [2] successfully demonstrated their potential to determine luminosity [3], [4]. Recently, the latest generation Timepix detectors, namely Timepix3 (TPX3) [5], were installed in the ATLAS cavern at CERN [6].…”

Section: Introductionmentioning

confidence: 99%

“…The use of the TPX3 device for luminosity measurements has several advantages compared to the previous luminosity measurements at the LHC during Run-1 (MPX devices) [3] and Run-2 (TPX devices) [4].…”

Section: Introductionmentioning

confidence: 99%

Timepix3 Luminosity Determination of 13-TeV Proton–Proton Collisions at the ATLAS Experiment

Sopczak

2020

IEEE Trans. Nucl. Sci.

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Medipix and Timepix devices, installed in the ATLAS cavern, have provided valuable complementary luminosity information. Results are presented from measurements with Timepix3 (TPX3) detectors. In contrast with previously employed frame-based data acquisition, the TPX3 detector remains active continuously, sending information on pixel hits as they occur. Hit-and cluster-counting methods were used for the luminosity determination of the LHC proton-proton collisions. The LHC luminosity versus time is determined using these two methods and fitted to a simple model, which incorporates luminosity reduction from single bunch and beam-beam interactions. The precision of the luminosity determination could be improved by counting the number of clusters, instead of just pixel hits. The internal precision and long-term stability of the TPX3 luminosity measurement are below 0.5%. TPX3, owing to its 1.56 ns timetagging, is able to resolve the time structure of the luminosity due to the collisions of individual proton bunches when integrated over an LHC fill.

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Enhanced long-lived dark photon signals at the LHC

Liu

Tran

2020

J. High Energ. Phys.

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We construct a model in which the standard model is extended by a hidden sector with two gauge U(1) bosons. A Dirac fermion ψ charged under both U(1) fields is introduced in the hidden sector which can be a subcomponent of the dark matter in the Universe. Stueckelberg mass terms between the two new gauge U(1) fields and the hypercharge gauge boson mediate the interactions between the standard model sector and the hidden sector. A remarkable collider signature of this model is the enhanced long-lived dark photon events at the LHC than the conventional dark photon models; the long-lived dark photons in the model can be discriminated from the background by measuring the time delay signal in the precision timing detectors which are proposed to be installed in the LHC upgrades and have an O(10) pico-second detection efficiency. Searches with current LHCb data are also investigated. Various experimental constraints on the model including collider constraints and cosmological constraints are also discussed.

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Precision Luminosity of LHC Proton–Proton Collisions at 13 TeV Using Hit Counting With TPX Pixel Devices

Cited by 15 publications

References 13 publications

Determination of Luminosity With Thermal Neutron Counting Using TPX Detectors in the ATLAS Cavern in LHC Proton-Proton Collisions at 13 TeV

Determination of Luminosity With Thermal Neutron Counting Using TPX Detectors in the ATLAS Cavern in LHC Proton-Proton Collisions at 13 TeV

Timepix3 Luminosity Determination of 13-TeV Proton–Proton Collisions at the ATLAS Experiment

Enhanced long-lived dark photon signals at the LHC

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