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000599761 0247_ $$2doi$$a10.1016/j.nima.2023.168550
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000599761 0247_ $$2arXiv$$aarXiv:2302.01566
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000599761 088__ $$2arXiv$$aarXiv:2302.01566
000599761 1001_ $$0P:(DE-H253)PIP1090696$$aNatochii, Andrii$$b0$$eCorresponding author
000599761 245__ $$aMeasured and projected beam backgrounds in the Belle II experiment at the SuperKEKB collider
000599761 260__ $$aAmsterdam$$bNorth-Holland Publ. Co.$$c2023
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000599761 500__ $$a28 pages, 17 figures, 9 tables (revised)
000599761 520__ $$aThe Belle II experiment at the SuperKEKB electron–positron collider aims to collect an unprecedented data set of 50 ab$^{-1}$ to study CP-violation in the B-meson system and to search for Physics beyond the Standard Model. SuperKEKB is already the world’s highest-luminosity collider. In order to collect the planned data set within approximately one decade, the target is to reach a peak luminosity of 6 x 10$^{35}$ cm$^{-2}$ s$^{-1}$ by further increasing the beam currents and reducing the beam size at the interaction point by squeezing the betatron function down to $\beta^{*}_y$ = 0.3 mm. To ensure detector longevity and maintain good reconstruction performance, beam backgrounds must remain well controlled. We report on current background rates in Belle II and compare these against simulation. We find that a number of recent refinements have significantly improved the background simulation accuracy. Finally, we estimate the safety margins going forward. We predict that backgrounds should remain high but acceptable until a luminosity of at least 2.8 x 10$^{35}$ cm$^{−2}$ s$^{−1}$ is reached for $\beta^{*}_y$ = 0.6 mm. At this point, the most vulnerable Belle II detectors, the Time-of-Propagation (TOP) particle identification system and the Central Drift Chamber (CDC), have predicted background hit rates from single-beam and luminosity backgrounds that add up to approximately half of the maximum acceptable rates.  
000599761 536__ $$0G:(DE-HGF)POF4-611$$a611 - Fundamental Particles and Forces (POF4-611)$$cPOF4-611$$fPOF IV$$x0
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000599761 650_7 $$2INSPIRE$$aelectron positron: annihilation
000599761 650_7 $$2INSPIRE$$aelectron positron: colliding beams
000599761 650_7 $$2INSPIRE$$abeam: background
000599761 650_7 $$2INSPIRE$$avertex: primary
000599761 650_7 $$2INSPIRE$$abeam: size
000599761 650_7 $$2INSPIRE$$aBELLE
000599761 650_7 $$2INSPIRE$$aKEK-B
000599761 650_7 $$2INSPIRE$$anew physics: search for
000599761 650_7 $$2INSPIRE$$aCP: violation
000599761 650_7 $$2INSPIRE$$aparticle identification
000599761 650_7 $$2INSPIRE$$adrift chamber
000599761 650_7 $$2INSPIRE$$asafety
000599761 650_7 $$2INSPIRE$$aperformance
000599761 650_7 $$2INSPIRE$$abetatron
000599761 650_7 $$2INSPIRE$$aexperimental results
000599761 650_7 $$2autogen$$aDetector background
000599761 650_7 $$2autogen$$aLepton collider
000599761 650_7 $$2autogen$$aMonte-Carlo simulation
000599761 693__ $$0EXP:(DE-H253)BELLE-20150101$$1EXP:(DE-H253)KEK-20150101$$5EXP:(DE-H253)BELLE-20150101$$aKEK$$eKEK: BELLE I/II$$x0
000599761 7001_ $$0P:(DE-H253)PIP1029907$$aBrowder, T. E.$$b1
000599761 7001_ $$0P:(DE-H253)PIP1080009$$aCao, L.$$b2
000599761 7001_ $$aCautero, G.$$b3
000599761 7001_ $$0P:(DE-H253)PIP1090938$$aDreyer, S.$$b4
000599761 7001_ $$aFrey, A.$$b5
000599761 7001_ $$aGabrielli, A.$$b6
000599761 7001_ $$aGiuressi, D.$$b7
000599761 7001_ $$aIshibashi, T.$$b8
000599761 7001_ $$aJin, Y.$$b9
000599761 7001_ $$aKojima, K.$$b10
000599761 7001_ $$aKraetzschmar, T.$$b11
000599761 7001_ $$aLanceri, L.$$b12
000599761 7001_ $$aLiptak, Z.$$b13
000599761 7001_ $$0P:(DE-H253)PIP1030837$$aLiventsev, D.$$b14
000599761 7001_ $$0P:(DE-H253)PIP1021580$$aMarinas, C.$$b15
000599761 7001_ $$0P:(DE-H253)PIP1095166$$aMassaccesi, L.$$b16
000599761 7001_ $$aMatsuoka, K.$$b17
000599761 7001_ $$aMeier, F.$$b18
000599761 7001_ $$aMiller, C.$$b19
000599761 7001_ $$aNakayama, H.$$b20
000599761 7001_ $$0P:(DE-H253)PIP1001849$$aNiebuhr, C.$$b21
000599761 7001_ $$aNovosel, A.$$b22
000599761 7001_ $$aParham, K.$$b23
000599761 7001_ $$aPopov, I.$$b24
000599761 7001_ $$aRizzo, G.$$b25
000599761 7001_ $$aRoney, J. M.$$b26
000599761 7001_ $$aRyu, S. Y.$$b27
000599761 7001_ $$aSantelj, L.$$b28
000599761 7001_ $$aSchneider, S.$$b29
000599761 7001_ $$aSchueler, J.$$b30
000599761 7001_ $$aSchwenker, B.$$b31
000599761 7001_ $$aShi, X. D.$$b32
000599761 7001_ $$0P:(DE-H253)PIP1006853$$aSimon, F.$$b33
000599761 7001_ $$0P:(DE-H253)PIP1086494$$aStefkova, S.$$b34
000599761 7001_ $$0P:(DE-H253)PIP1025717$$aTakahashi, M.$$b35
000599761 7001_ $$00000-0003-3681-9985$$aTanigawa, H.$$b36
000599761 7001_ $$00000-0002-1462-0564$$aTaniguchi, N.$$b37
000599761 7001_ $$00000-0001-5211-9079$$aTerui, S.$$b38
000599761 7001_ $$aVahsen, S. E.$$b39
000599761 7001_ $$aVitale, L.$$b40
000599761 7001_ $$aVossen, A.$$b41
000599761 7001_ $$aWang, Z.$$b42
000599761 7001_ $$aWiechczynski, J.$$b43
000599761 7001_ $$aWindel, H.$$b44
000599761 7001_ $$0P:(DE-H253)PIP1091238$$aYoshihara, K.$$b45
000599761 773__ $$0PERI:(DE-600)1466532-3$$a10.1016/j.nima.2023.168550$$gVol. 1055, p. 168550 -$$p168550$$tNuclear instruments & methods in physics research / Section A$$v1055$$x0167-5087$$y2023
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