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Performance of the missing transverse momentum triggers for the ATLAS detector during Run-2 data taking

The ATLAS collaboration
JHEP 08 (2020) 080, 2020.

Abstract
The factor of four increase in the LHC luminosity, from $0.5\times 10^{34}\,\textrm{cm}^{-2}\textrm{s}^{-1}$ to $2.0\times 10^{34}\textrm{cm}^{-2}\textrm{s}^{-1}$, and the corresponding increase in pile-up collisions during the 2015-2018 data-taking period, presented a challenge for ATLAS to trigger on missing transverse momentum. The output data rate at fixed threshold typically increases exponentially with the number of pile-up collisions, so the legacy algorithms from previous LHC data-taking periods had to be tuned and new approaches developed to maintain the high trigger efficiency achieved in earlier operations. A study of the trigger performance and comparisons with simulations show that these changes resulted in event selection efficiencies of >98% for this period, meeting and in some cases exceeding the performance of similar triggers in earlier run periods, while at the same time keeping the necessary bandwidth within acceptable limits.

  • Figure 1a; Efficiency corrected data

    Page 10

    10.17182/hepdata.95967.v1/t1

    A comparison of the measured cell $E_T^{miss}$ distribution with that predicted by the two-component model for two pile-up scenarios. The...

  • Figure 1a; Zero bias data

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    10.17182/hepdata.95967.v1/t2

    A comparison of the measured cell $E_T^{miss}$ distribution with that predicted by the two-component model for two pile-up scenarios. The...

  • Figure 1a; Sum ET model

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    10.17182/hepdata.95967.v1/t3

    A comparison of the measured cell $E_T^{miss}$ distribution with that predicted by the two-component model for two pile-up scenarios. The...

  • Figure 1a; Frechet Function

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    10.17182/hepdata.95967.v1/t4

    A comparison of the measured cell $E_T^{miss}$ distribution with that predicted by the two-component model for two pile-up scenarios. The...

  • Figure 1a; Full model

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    10.17182/hepdata.95967.v1/t5

    A comparison of the measured cell $E_T^{miss}$ distribution with that predicted by the two-component model for two pile-up scenarios. The...

  • Figure 1b; Efficiency corrected data

    Page 10

    10.17182/hepdata.95967.v1/t6

    A comparison of the measured cell $E_T^{miss}$ distribution with that predicted by the two-component model for two pile-up scenarios. The...

  • Figure 1b; Zero bias data

    Page 10

    10.17182/hepdata.95967.v1/t7

    A comparison of the measured cell $E_T^{miss}$ distribution with that predicted by the two-component model for two pile-up scenarios. The...

  • Figure 1b; Sum ET model

    Page 10

    10.17182/hepdata.95967.v1/t8

    A comparison of the measured cell $E_T^{miss}$ distribution with that predicted by the two-component model for two pile-up scenarios. The...

  • Figure 1b; Frechet Function

    Page 10

    10.17182/hepdata.95967.v1/t9

    A comparison of the measured cell $E_T^{miss}$ distribution with that predicted by the two-component model for two pile-up scenarios. The...

  • Figure 1b; Full model

    Page 10

    10.17182/hepdata.95967.v1/t10

    A comparison of the measured cell $E_T^{miss}$ distribution with that predicted by the two-component model for two pile-up scenarios. The...

  • Figure 2

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    10.17182/hepdata.95967.v1/t11

    The $E_T^{miss}$ model predicted trigger rate as a function of $\mu$ for the cell $E_T^{miss}$ algorithm with a threshold of...

  • Figure 3a; L1 ETmiss trigger efficiency

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    10.17182/hepdata.95967.v1/t12

    The L1 $E_T^{miss}$ trigger efficiency, shown as a function of $p_T(\mu\mu)$ in $Z\rightarrow\mu\mu$ events.

  • Figure 3b; L1 ETmiss trigger efficiency stability

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    10.17182/hepdata.95967.v1/t13

    The efficiencies in the plot are shown for events satisfying a $Z\rightarrow\mu\mu$ selection and with $p_T(\mu\mu)$ larger than $150\,$GeV vs...

  • Figure 4a; L1 ETmiss trigger rate; Period alpha

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    10.17182/hepdata.95967.v1/t14

    The L1 $E_T^{miss}$ trigger rate as a function of $\langle\mu\rangle$ for runs in three different periods ($\alpha$, $\beta$, $\gamma$) in...

  • Figure 4a; L1 ETmiss trigger rate; Period beta

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    10.17182/hepdata.95967.v1/t15

    The L1 $E_T^{miss}$ trigger rate as a function of $\langle\mu\rangle$ for runs in three different periods ($\alpha$, $\beta$, $\gamma$) in...

  • Figure 4a; L1 ETmiss trigger rate; Period gamma

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    10.17182/hepdata.95967.v1/t16

    The L1 $E_T^{miss}$ trigger rate as a function of $\langle\mu\rangle$ for runs in three different periods ($\alpha$, $\beta$, $\gamma$) in...

  • Figure 4b; L1 ETmiss trigger efficiency vs. mu

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    10.17182/hepdata.95967.v1/t17

    The L1 $E_T^{miss}$ trigger efficiency is shown as a function of mean pile-up for events satisfying a $Z\rightarrow\mu\mu$ selection and...

  • Figure 5a; acceptance vs efficiency; mu 0-20; cell

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    10.17182/hepdata.95967.v1/t18

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5a; acceptance vs efficiency; mu 0-20; tc_lcw

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    10.17182/hepdata.95967.v1/t19

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5a; acceptance vs efficiency; mu 0-20; mht

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    10.17182/hepdata.95967.v1/t20

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5a; acceptance vs efficiency; mu 0-20; pufit

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    10.17182/hepdata.95967.v1/t21

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5a; acceptance vs efficiency; mu 0-20; pufit>110

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    10.17182/hepdata.95967.v1/t22

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5b; acceptance vs efficiency; mu 20-30; cell

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    10.17182/hepdata.95967.v1/t23

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5b; acceptance vs efficiency; mu 20-30; tc_lcw

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    10.17182/hepdata.95967.v1/t24

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5b; acceptance vs efficiency; mu 20-30; mht

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    10.17182/hepdata.95967.v1/t25

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5b; acceptance vs efficiency; mu 20-30; pufit

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    10.17182/hepdata.95967.v1/t26

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5b; acceptance vs efficiency; mu 20-30; pufit>110

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    10.17182/hepdata.95967.v1/t27

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5c; acceptance vs efficiency; mu 30-40; cell

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    10.17182/hepdata.95967.v1/t28

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5c; acceptance vs efficiency; mu 30-40; tc_lcw

    Page 13

    10.17182/hepdata.95967.v1/t29

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5c; acceptance vs efficiency; mu 30-40; mht

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    10.17182/hepdata.95967.v1/t30

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5c; acceptance vs efficiency; mu 30-40; pufit

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    10.17182/hepdata.95967.v1/t31

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5c; acceptance vs efficiency; mu 30-40; pufit>110

    Page 13

    10.17182/hepdata.95967.v1/t32

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5d; acceptance vs efficiency; mu 40-; cell

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    10.17182/hepdata.95967.v1/t33

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5d; acceptance vs efficiency; mu 40-; tc_lcw

    Page 13

    10.17182/hepdata.95967.v1/t34

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5d; acceptance vs efficiency; mu 40-; mht

    Page 13

    10.17182/hepdata.95967.v1/t35

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5d; acceptance vs efficiency; mu 40-; pufit

    Page 13

    10.17182/hepdata.95967.v1/t36

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 5d; acceptance vs efficiency; mu 40-; pufit>110

    Page 13

    10.17182/hepdata.95967.v1/t37

    Background acceptance vs signal efficiency for each of four individual HLT $E_T^{miss}$ algorithms for a $Z\rightarrow\mu\mu$ selection with $p_T(\mu\mu) >...

  • Figure 6a; acceptance vs efficiency; pTmumu>150; cell

    Page 14

    10.17182/hepdata.95967.v1/t38

    Relative background acceptance fraction vs. relative efficiency for two different $p_T(\mu\mu)>150\,$GeV threshold for data recorded in the year 2018. Two...

  • Figure 6a; acceptance vs efficiency; pTmumu>150; pufit

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    10.17182/hepdata.95967.v1/t39

    Relative background acceptance fraction vs. relative efficiency for two different $p_T(\mu\mu)>150\,$GeV threshold for data recorded in the year 2018. Two...

  • Figure 6a; acceptance vs efficiency; pTmumu>150; pufit+cell>65

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    10.17182/hepdata.95967.v1/t40

    Relative background acceptance fraction vs. relative efficiency for two different $p_T(\mu\mu)>150\,$GeV threshold for data recorded in the year 2018. Two...

  • Figure 6a; acceptance vs efficiency; pTmumu>150; pufit+cell>70

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    10.17182/hepdata.95967.v1/t41

    Relative background acceptance fraction vs. relative efficiency for two different $p_T(\mu\mu)>150\,$GeV threshold for data recorded in the year 2018. Two...

  • Figure 6a; acceptance vs efficiency; pTmumu>150; pufit>110

    Page 14

    10.17182/hepdata.95967.v1/t42

    Relative background acceptance fraction vs. relative efficiency for two different $p_T(\mu\mu)>150\,$GeV threshold for data recorded in the year 2018. Two...

  • Figure 6a; acceptance vs efficiency; pTmumu>150; pufit110+cell65

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    10.17182/hepdata.95967.v1/t43

    Relative background acceptance fraction vs. relative efficiency for two different $p_T(\mu\mu)>150\,$GeV threshold for data recorded in the year 2018. Two...

  • Figure 6b; acceptance vs efficiency; pTmumu>175; cell

    Page 14

    10.17182/hepdata.95967.v1/t44

    Relative background acceptance fraction vs. relative efficiency for two different $p_T(\mu\mu)>150\,$GeV threshold for data recorded in the year 2018. Two...

  • Figure 6b; acceptance vs efficiency; pTmumu>175; pufit

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    10.17182/hepdata.95967.v1/t45

    Relative background acceptance fraction vs. relative efficiency for two different $p_T(\mu\mu)>150\,$GeV threshold for data recorded in the year 2018. Two...

  • Figure 6b; acceptance vs efficiency; pTmumu>175; pufit+cell>65

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    10.17182/hepdata.95967.v1/t46

    Relative background acceptance fraction vs. relative efficiency for two different $p_T(\mu\mu)>150\,$GeV threshold for data recorded in the year 2018. Two...

  • Figure 6b; acceptance vs efficiency; pTmumu>175; pufit+cell>70

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    10.17182/hepdata.95967.v1/t47

    Relative background acceptance fraction vs. relative efficiency for two different $p_T(\mu\mu)>150\,$GeV threshold for data recorded in the year 2018. Two...

  • Figure 6b; acceptance vs efficiency; pTmumu>175; pufit>110

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    10.17182/hepdata.95967.v1/t48

    Relative background acceptance fraction vs. relative efficiency for two different $p_T(\mu\mu)>150\,$GeV threshold for data recorded in the year 2018. Two...

  • Figure 6b; acceptance vs efficiency; pTmumu>175; pufit110+cell65

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    10.17182/hepdata.95967.v1/t49

    Relative background acceptance fraction vs. relative efficiency for two different $p_T(\mu\mu)>150\,$GeV threshold for data recorded in the year 2018. Two...

  • Figure 7a

    Page 14 bottom left

    10.17182/hepdata.95967.v1/t50

    Turn-on efficiency curves are shown for $Z\rightarrow\mu\mu$ events for three algorithms: the cell algorithm alone, the pufit algorithm alone and...

  • Figure 7b

    Page 14 bottom right

    10.17182/hepdata.95967.v1/t51

    Turn-on efficiency curves are shown for $Z\rightarrow\mu\mu$ events for three algorithms: the cell algorithm alone, the pufit algorithm alone and...

  • Figure 8a

    Page 14 top left

    10.17182/hepdata.95967.v1/t52

    Efficiencies for $Z\rightarrow\mu\mu$ events are shown for the L1 $E_T^{miss}>50\,$GeV trigger and for the complete L1+HLT trigger chain that also...

  • Figure 8b

    Page 14 top right

    10.17182/hepdata.95967.v1/t53

    Efficiencies for $Z\rightarrow\mu\mu$ events are shown for the L1 $E_T^{miss}>50\,$GeV trigger and for the complete L1+HLT trigger chain that also...

  • Figure 8c

    Page 14 bottom left

    10.17182/hepdata.95967.v1/t54

    Efficiencies for $Z\rightarrow\mu\mu$ events are shown for the L1 $E_T^{miss}>50\,$GeV trigger and for the complete L1+HLT trigger chain that also...

  • Figure 8d

    Page 14 bottom right

    10.17182/hepdata.95967.v1/t55

    Efficiencies for $Z\rightarrow\mu\mu$ events are shown for the L1 $E_T^{miss}>50\,$GeV trigger and for the complete L1+HLT trigger chain that also...

  • Figure 9; 2015; mht 70

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    10.17182/hepdata.95967.v1/t56

    HLT_xe70_mht trigger output rate as a function of $\langle\mu\rangle$ shown for an example run in year 2015.

  • Figure 9; 2016; mht 90

    Page 17 top

    10.17182/hepdata.95967.v1/t57

    HLT_xe90_mht trigger output rate as a function of $\langle\mu\rangle$ shown for an example run in year 2016.

  • Figure 9; 2016; mht 110

    Page 17 top

    10.17182/hepdata.95967.v1/t58

    HLT_xe110_mht trigger output rate as a function of $\langle\mu\rangle$ shown for an example run in year 2016.

  • Figure 9; 2017; cell 50, pufit 110

    Page 17 top

    10.17182/hepdata.95967.v1/t59

    HLT_xe110_pufit trigger output rate as a function of $\langle\mu\rangle$ shown for an example run in year 2017. This trigger included...

  • Figure 9; 2018; cell 65, pufit 110

    Page 17 top

    10.17182/hepdata.95967.v1/t60

    HLT_xe110_pufit_xe65 trigger output rate as a function of $\langle\mu\rangle$ shown for an example run in year 2018.

  • Figure 9; 2018; cell 70, pufit 110

    Page 17 top

    10.17182/hepdata.95967.v1/t61

    HLT_xe110_pufit_xe70 trigger output rate as a function of $\langle\mu\rangle$ shown for an example run in year 2018.

  • Figure 10a

    Page 18 top left

    10.17182/hepdata.95967.v1/t62

    Full-chain trigger efficiencies for each year as a function of $p_T(\mu\mu)$. The efficiency corresponds to that of the lowest unprescaled...

  • Figure 10b

    Page 18 top right

    10.17182/hepdata.95967.v1/t63

    Full-chain trigger efficiencies for 2015, 2016, 2017 and 2018 as a function of $\langle\mu\rangle$ for $p_T(\mu\mu)>150$ GeV. The efficiency corresponds...

  • Figure 11a

    Page 20 top left

    10.17182/hepdata.95967.v1/t64

    Efficiencies for the first-level trigger L1XE50 and the combined L1+HLT trigger chain HLT_xe110_pufit_xe65_L1XE50 in data recorded in the year 2018...

  • Figure 11b

    Page 20 top right

    10.17182/hepdata.95967.v1/t65

    Efficiencies for the first-level trigger L1XE50 and the combined L1+HLT trigger chain HLT_xe110_pufit_xe65_L1XE50 in data recorded in the year 2018...

  • Figure 11c

    Page 20 bottom left

    10.17182/hepdata.95967.v1/t66

    Efficiencies for the first-level trigger L1XE50 and the combined L1+HLT trigger chain HLT_xe110_pufit_xe65_L1XE50 in data recorded in the year 2018...

  • Figure 11d

    Page 20 bottom right

    10.17182/hepdata.95967.v1/t67

    Efficiencies for the first-level trigger L1XE50 and the combined L1+HLT trigger chain HLT_xe110_pufit_xe65_L1XE50 in data recorded in the year 2018...

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