MCPLOTS

Details for Pythia 8.313 dire-default vs. 8.315

pp/ppbar → Z (Drell-Yan)

Observable	Reference	Energy	Δ	χ2+5% (8.315)
Underlying event <Nch> vs p_T^Z	ATLAS_2019_I1736531	13000	-	6.3
	d06-x01-y01	13000	-	9.3
	d07-x01-y01	13000	-	8.4
	d08-x01-y01	13000	-	8.2
	d09-x01-y01	13000	-	7.0
	d10-x01-y01	13000	-	6.4
	d21-x01-y01	13000	-	9.9
	d22-x01-y01	13000	-	7.3
	d23-x01-y01	13000	-	8.5
	d24-x01-y01	13000	-	5.9
	d25-x01-y01	13000	-	4.8
	d36-x01-y01	13000	-	4.8
	d37-x01-y01	13000	-	3.8
	d38-x01-y01	13000	-	3.0
	d39-x01-y01	13000	-	3.4
	d40-x01-y01	13000	-	4.4
Underlying event <p_T>	ATLAS_2019_I1736531	13000	-	7.9*
	d166-x01-y01	13000	-	8.7
	d167-x01-y01	13000	-	n/a
	d168-x01-y01	13000	-	19
	d169-x01-y01	13000	-	n/a
	d174-x01-y01	13000	-	7.9
	d175-x01-y01	13000	-	16
	d176-x01-y01	13000	-	27
	d177-x01-y01	13000	-	n/a
	d182-x01-y01	13000	-	1.4
	d183-x01-y01	13000	-	4.8
	d184-x01-y01	13000	-	7.8
	d185-x01-y01	13000	-	n/a
	d190-x01-y01	13000	-	7.0
	d191-x01-y01	13000	-	14
	d192-x01-y01	13000	-	16
	d193-x01-y01	13000	-	10
	d198-x01-y01	13000	-	8.4
	d199-x01-y01	13000	-	7.8
	d200-x01-y01	13000	-	5.1
	d201-x01-y01	13000	-	1.8
	d326-x01-y01	13000	-	n/a
	d327-x01-y01	13000	-	n/a
	d328-x01-y01	13000	-	n/a
	d329-x01-y01	13000	-	n/a
	d334-x01-y01	13000	-	n/a
	d335-x01-y01	13000	-	n/a
	d336-x01-y01	13000	-	n/a
	d337-x01-y01	13000	-	n/a
	d342-x01-y01	13000	-	2.8
	d343-x01-y01	13000	-	1.4
	d344-x01-y01	13000	-	n/a
	d345-x01-y01	13000	-	n/a
	d350-x01-y01	13000	-	5.7
	d351-x01-y01	13000	-	6.4
	d352-x01-y01	13000	-	5.2
	d353-x01-y01	13000	-	n/a
	d358-x01-y01	13000	-	n/a
	d359-x01-y01	13000	-	n/a
	d360-x01-y01	13000	-	2.5
	d361-x01-y01	13000	-	n/a
	d486-x01-y01	13000	-	4.3
	d487-x01-y01	13000	-	n/a
	d488-x01-y01	13000	-	13
	d489-x01-y01	13000	-	n/a
	d494-x01-y01	13000	-	3.1
	d495-x01-y01	13000	-	13
	d496-x01-y01	13000	-	20
	d497-x01-y01	13000	-	n/a
	d502-x01-y01	13000	-	2.1
	d503-x01-y01	13000	-	6.5
	d504-x01-y01	13000	-	n/a
	d505-x01-y01	13000	-	n/a
	d510-x01-y01	13000	-	2.7
	d511-x01-y01	13000	-	9.9
	d512-x01-y01	13000	-	14
	d513-x01-y01	13000	-	6.5
	d518-x01-y01	13000	-	4.0
	d519-x01-y01	13000	-	4.2
	d520-x01-y01	13000	-	2.5
	d521-x01-y01	13000	-	1.3
<pT> vs Nch	CDF_2010_I849042	1960	-	20
	d08-x01-y01	1960	-	36
	d09-x01-y01	1960	-	2.8
Transverse <pT> vs p_T^lead	CDF_2010_I849042	1960	-	15
Toward <pT> vs p_T^lead	CDF_2010_I849042	1960	-	5.5
Underlying event <p_T> vs p_T^Z	ATLAS_2019_I1736531	13000	-	7.2
	d11-x01-y01	13000	-	7.5
	d12-x01-y01	13000	-	16
	d13-x01-y01	13000	-	4.9
	d14-x01-y01	13000	-	14
	d15-x01-y01	13000	-	2.6
	d16-x01-y01	13000	-	9.5
	d17-x01-y01	13000	-	7.5
	d18-x01-y01	13000	-	8.1
	d19-x01-y01	13000	-	6.7
	d20-x01-y01	13000	-	6.4
	d26-x01-y01	13000	-	0.89
	d27-x01-y01	13000	-	3.0
	d28-x01-y01	13000	-	1.3
	d29-x01-y01	13000	-	2.7
	d30-x01-y01	13000	-	3.6
	d41-x01-y01	13000	-	8.9
	d42-x01-y01	13000	-	17
	d43-x01-y01	13000	-	6.1
	d44-x01-y01	13000	-	15
	d45-x01-y01	13000	-	2.7
<pT>_Z vs Nch	CDF_2010_I849042	1960	-	30
Underlying event Σ(pT) vs p_T^Z	ATLAS_2019_I1736531	13000	-	20
	d01-x01-y01	13000	-	11
	d02-x01-y01	13000	-	34
	d03-x01-y01	13000	-	18
	d04-x01-y01	13000	-	50
	d05-x01-y01	13000	-	4.4
	d31-x01-y01	13000	-	7.7
	d32-x01-y01	13000	-	28
	d33-x01-y01	13000	-	11
	d34-x01-y01	13000	-	33
	d35-x01-y01	13000	-	1.9
Underlying event p_T spectrum	ATLAS_2019_I1736531	13000	-	4.8*
	d206-x01-y01	13000	-	4.6
	d207-x01-y01	13000	-	1.1
	d208-x01-y01	13000	-	1.5
	d209-x01-y01	13000	-	1.4
	d214-x01-y01	13000	-	4.1
	d215-x01-y01	13000	-	1.2
	d216-x01-y01	13000	-	1.7
	d217-x01-y01	13000	-	1.6
	d222-x01-y01	13000	-	3.4
	d223-x01-y01	13000	-	1.3
	d224-x01-y01	13000	-	0.93
	d225-x01-y01	13000	-	n/a
	d230-x01-y01	13000	-	9.0
	d231-x01-y01	13000	-	10.0
	d232-x01-y01	13000	-	13
	d233-x01-y01	13000	-	n/a
	d238-x01-y01	13000	-	3.2
	d239-x01-y01	13000	-	0.93
	d240-x01-y01	13000	-	0.78
	d241-x01-y01	13000	-	0.85
	d366-x01-y01	13000	-	1.6
	d367-x01-y01	13000	-	1.8
	d368-x01-y01	13000	-	2.1
	d369-x01-y01	13000	-	2.0
	d374-x01-y01	13000	-	1.1
	d375-x01-y01	13000	-	5.6
	d376-x01-y01	13000	-	6.2
	d377-x01-y01	13000	-	5.7
	d382-x01-y01	13000	-	1.1
	d383-x01-y01	13000	-	3.7
	d384-x01-y01	13000	-	3.7
	d385-x01-y01	13000	-	n/a
	d390-x01-y01	13000	-	12
	d391-x01-y01	13000	-	22
	d392-x01-y01	13000	-	23
	d393-x01-y01	13000	-	n/a
	d398-x01-y01	13000	-	1.1
	d399-x01-y01	13000	-	1.7
	d400-x01-y01	13000	-	1.6
	d401-x01-y01	13000	-	0.97
	d46-x01-y01	13000	-	3.6
	d47-x01-y01	13000	-	1.1
	d48-x01-y01	13000	-	2.3
	d49-x01-y01	13000	-	1.7
	d54-x01-y01	13000	-	2.5
	d55-x01-y01	13000	-	2.1
	d56-x01-y01	13000	-	4.0
	d57-x01-y01	13000	-	4.3
	d62-x01-y01	13000	-	2.7
	d63-x01-y01	13000	-	1.3
	d64-x01-y01	13000	-	1.3
	d65-x01-y01	13000	-	1.6
	d70-x01-y01	13000	-	15
	d71-x01-y01	13000	-	21
	d72-x01-y01	13000	-	23
	d73-x01-y01	13000	-	19
	d78-x01-y01	13000	-	2.0
	d79-x01-y01	13000	-	1.2
	d80-x01-y01	13000	-	1.9
	d81-x01-y01	13000	-	1.1
Jet Substructure Splitting scale d0	ATLAS_2017_I1589844	8000	-	45
	d01-x01-y01	8000	-	65
	d01-x01-y02	8000	-	56
	d01-x01-y03	8000	-	69
	d01-x01-y04	8000	-	57
	d01-x01-y05	8000	-	32
	d01-x01-y06	8000	-	24
	d01-x01-y07	8000	-	32
	d01-x01-y08	8000	-	28
Jet Substructure Splitting scale d1	ATLAS_2017_I1589844	8000	-	47*
	d02-x01-y01	8000	-	n/a
	d02-x01-y02	8000	-	n/a
	d02-x01-y03	8000	-	n/a
	d02-x01-y04	8000	-	n/a
	d02-x01-y05	8000	-	47
	d02-x01-y06	8000	-	50
	d02-x01-y07	8000	-	47
	d02-x01-y08	8000	-	44
Jet Substructure Splitting scale d2	ATLAS_2017_I1589844	8000	-	39*
	d03-x01-y01	8000	-	n/a
	d03-x01-y02	8000	-	n/a
	d03-x01-y03	8000	-	65
	d03-x01-y04	8000	-	n/a
	d03-x01-y05	8000	-	35
	d03-x01-y06	8000	-	27
	d03-x01-y07	8000	-	32
	d03-x01-y08	8000	-	34
Jet Substructure Splitting scale d3	ATLAS_2017_I1589844	8000	-	34*
	d04-x01-y01	8000	-	n/a
	d04-x01-y02	8000	-	n/a
	d04-x01-y03	8000	-	n/a
	d04-x01-y04	8000	-	45
	d04-x01-y05	8000	-	28
	d04-x01-y06	8000	-	27
	d04-x01-y07	8000	-	36
	d04-x01-y08	8000	-	32
Jet Substructure Splitting scale d4	ATLAS_2017_I1589844	8000	-	39*
	d05-x01-y01	8000	-	44
	d05-x01-y02	8000	-	n/a
	d05-x01-y03	8000	-	60
	d05-x01-y04	8000	-	42
	d05-x01-y05	8000	-	26
	d05-x01-y06	8000	-	21
	d05-x01-y07	8000	-	42
	d05-x01-y08	8000	-	37
Jet Substructure Splitting scale d5	ATLAS_2017_I1589844	8000	-	37
	d06-x01-y01	8000	-	37
	d06-x01-y02	8000	-	30
	d06-x01-y03	8000	-	55
	d06-x01-y04	8000	-	39
	d06-x01-y05	8000	-	26
	d06-x01-y06	8000	-	22
	d06-x01-y07	8000	-	48
	d06-x01-y08	8000	-	36
Jet Substructure Splitting scale d6	ATLAS_2017_I1589844	8000	-	34
	d07-x01-y01	8000	-	33
	d07-x01-y02	8000	-	25
	d07-x01-y03	8000	-	48
	d07-x01-y04	8000	-	33
	d07-x01-y05	8000	-	30
	d07-x01-y06	8000	-	22
	d07-x01-y07	8000	-	45
	d07-x01-y08	8000	-	34
Jet Substructure Splitting scale d7	ATLAS_2017_I1589844	8000	-	32
	d08-x01-y01	8000	-	31
	d08-x01-y02	8000	-	23
	d08-x01-y03	8000	-	33
	d08-x01-y04	8000	-	28
	d08-x01-y05	8000	-	39
	d08-x01-y06	8000	-	26
	d08-x01-y07	8000	-	45
	d08-x01-y08	8000	-	33
Dilepton Δη	ATLAS_2016_I1467454	8000	-	15
	d24-x01-y01	8000	-	29
	d25-x01-y01	8000	-	23
	d26-x01-y01	8000	-	13
	d27-x01-y01	8000	-	4.9
	d28-x01-y01	8000	-	3.9
	d35-x01-y01	8000	-	25
	d36-x01-y01	8000	-	23
	d37-x01-y01	8000	-	16
	d38-x01-y01	8000	-	11
	d39-x01-y01	8000	-	5.3
Dilepton m	ATLAS_2019_I1725190	13000	-	n/a
	d01-x01-y01	13000	-	n/a
	d02-x01-y01	13000	-	n/a
Dilepton φ^*_η	CMS_2019_I1753680	13000	-	66
	d28-x01-y01	13000	-	62
	d28-x01-y02	13000	-	60
	d28-x01-y03	13000	-	77
	CMS_2022_I2079374	13000	-	48
	d19-x01-y01	13000	-	100
	d21-x01-y01	13000	-	58
	d23-x01-y01	13000	-	42
	d25-x01-y01	13000	-	24
	d27-x01-y01	13000	-	9.9
	D0_2010_I871787	1960	-	1.6*
	d01-x01-y01	1960	-	1.8
	d01-x01-y02	1960	-	1.9
	d01-x01-y03	1960	-	n/a
	d02-x01-y01	1960	-	1.4
	d02-x01-y02	1960	-	1.3
	LHCB_2012_I1208102	7000	-	9.4
	LHCB_2021_I1990313	13000	-	23*
	d20-x01-y01	13000	-	35
	d22-x01-y01	13000	-	24
	d22-x01-y02	13000	-	28
	d22-x01-y03	13000	-	16
	d22-x01-y04	13000	-	11
	d22-x01-y05	13000	-	n/a
Dilepton φ^*_η ratio	CMS_2022_I2079374	13000	-	4.6*
	d43-x01-y01	13000	-	12
	d45-x01-y01	13000	-	0.48
	d47-x01-y01	13000	-	1.3
	d49-x01-y01	13000	-	n/a
ll.phiStar_norm	ATLAS_2019_I1768911	13000	-	15
ll.phiStar_norm	CMS_2019_I1753680	13000	-	38
Dilepton p_T	LHCB_2021_I1990313	13000	-	24
	d19-x01-y01	13000	-	40
	d21-x01-y01	13000	-	28
	d21-x01-y02	13000	-	34
	d21-x01-y03	13000	-	21
	d21-x01-y04	13000	-	15
	d21-x01-y05	13000	-	5.8
Dilepton y	LHCB_2021_I1990313	13000	-	23
Transverse Max(pT) vs p_T^lead	CDF_2010_I849042	1960	-	29
Toward Max(pT) vs p_T^lead	CDF_2010_I849042	1960	-	6.9
Underlying event Nch	ATLAS_2019_I1736531	13000	-	10
	d102-x01-y01	13000	-	24
	d103-x01-y01	13000	-	8.2
	d104-x01-y01	13000	-	7.1
	d105-x01-y01	13000	-	2.7
	d110-x01-y01	13000	-	33
	d111-x01-y01	13000	-	10.0
	d112-x01-y01	13000	-	7.5
	d113-x01-y01	13000	-	2.7
	d118-x01-y01	13000	-	32
	d119-x01-y01	13000	-	14
	d120-x01-y01	13000	-	9.7
	d121-x01-y01	13000	-	4.0
	d246-x01-y01	13000	-	34
	d247-x01-y01	13000	-	11
	d248-x01-y01	13000	-	9.1
	d249-x01-y01	13000	-	3.6
	d254-x01-y01	13000	-	35
	d255-x01-y01	13000	-	14
	d256-x01-y01	13000	-	11
	d257-x01-y01	13000	-	3.2
	d262-x01-y01	13000	-	21
	d263-x01-y01	13000	-	10
	d264-x01-y01	13000	-	11
	d265-x01-y01	13000	-	3.4
	d270-x01-y01	13000	-	34
	d271-x01-y01	13000	-	14
	d272-x01-y01	13000	-	12
	d273-x01-y01	13000	-	4.3
	d278-x01-y01	13000	-	33
	d279-x01-y01	13000	-	14
	d280-x01-y01	13000	-	8.7
	d281-x01-y01	13000	-	2.5
	d406-x01-y01	13000	-	11
	d407-x01-y01	13000	-	2.9
	d408-x01-y01	13000	-	3.4
	d409-x01-y01	13000	-	2.0
	d414-x01-y01	13000	-	7.7
	d415-x01-y01	13000	-	0.79
	d416-x01-y01	13000	-	1.2
	d417-x01-y01	13000	-	1.0
	d422-x01-y01	13000	-	7.0
	d423-x01-y01	13000	-	0.91
	d424-x01-y01	13000	-	0.92
	d425-x01-y01	13000	-	1.0
	d430-x01-y01	13000	-	8.8
	d431-x01-y01	13000	-	0.72
	d432-x01-y01	13000	-	0.98
	d433-x01-y01	13000	-	1.1
	d438-x01-y01	13000	-	11
	d439-x01-y01	13000	-	4.3
	d440-x01-y01	13000	-	3.8
	d441-x01-y01	13000	-	2.2
	d86-x01-y01	13000	-	33
	d87-x01-y01	13000	-	11
	d88-x01-y01	13000	-	9.9
	d89-x01-y01	13000	-	4.7
	d94-x01-y01	13000	-	30
	d95-x01-y01	13000	-	9.3
	d96-x01-y01	13000	-	7.6
	d97-x01-y01	13000	-	2.4
Away <Nch> vs p_T^lead	CDF_2010_I849042	1960	-	13
Transverse <Nch> vs p_T^lead	CDF_2010_I849042	1960	-	21
nch-vs-pt-trnsDif	CDF_2010_I849042	1960	-	9.9
TransMAX <Nch> vs p_T^lead	CDF_2010_I849042	1960	-	19
TransMIN <Nch> vs p_T^lead	CDF_2010_I849042	1960	-	31
Toward <Nch> vs p_T^lead	CDF_2010_I849042	1960	-	31
Jet Multiplicities Jet multiplicity	CMS_EWK_10_012	7000	-	n/a
	d05-x01-y01	7000	-	n/a
	d07-x01-y01	7000	-	n/a
Jet Multiplicities Ratios of jet multiplicity	CMS_EWK_10_012	7000	-	n/a
	d06-x01-y01	7000	-	n/a
	d08-x01-y01	7000	-	n/a
Underlying event Scalar Σ(p_T)	ATLAS_2019_I1736531	13000	-	13
	d126-x01-y01	13000	-	37
	d127-x01-y01	13000	-	11
	d128-x01-y01	13000	-	10
	d129-x01-y01	13000	-	4.3
	d134-x01-y01	13000	-	33
	d135-x01-y01	13000	-	7.9
	d136-x01-y01	13000	-	5.7
	d137-x01-y01	13000	-	2.8
	d142-x01-y01	13000	-	33
	d143-x01-y01	13000	-	7.7
	d144-x01-y01	13000	-	8.1
	d145-x01-y01	13000	-	3.8
	d150-x01-y01	13000	-	41
	d151-x01-y01	13000	-	9.4
	d152-x01-y01	13000	-	6.7
	d153-x01-y01	13000	-	2.2
	d158-x01-y01	13000	-	34
	d159-x01-y01	13000	-	15
	d160-x01-y01	13000	-	8.2
	d161-x01-y01	13000	-	1.3
	d286-x01-y01	13000	-	39
	d287-x01-y01	13000	-	13
	d288-x01-y01	13000	-	11
	d289-x01-y01	13000	-	3.5
	d294-x01-y01	13000	-	37
	d295-x01-y01	13000	-	14
	d296-x01-y01	13000	-	12
	d297-x01-y01	13000	-	3.6
	d302-x01-y01	13000	-	28
	d303-x01-y01	13000	-	8.1
	d304-x01-y01	13000	-	11
	d305-x01-y01	13000	-	4.7
	d310-x01-y01	13000	-	37
	d311-x01-y01	13000	-	13
	d312-x01-y01	13000	-	83
	d313-x01-y01	13000	-	3.7
	d318-x01-y01	13000	-	39
	d319-x01-y01	13000	-	16
	d320-x01-y01	13000	-	11
	d321-x01-y01	13000	-	1.7
	d446-x01-y01	13000	-	12
	d447-x01-y01	13000	-	3.0
	d448-x01-y01	13000	-	4.8
	d449-x01-y01	13000	-	2.3
	d454-x01-y01	13000	-	7.6
	d455-x01-y01	13000	-	0.82
	d456-x01-y01	13000	-	2.6
	d457-x01-y01	13000	-	2.3
	d462-x01-y01	13000	-	9.5
	d463-x01-y01	13000	-	0.81
	d464-x01-y01	13000	-	1.7
	d465-x01-y01	13000	-	1.8
	d470-x01-y01	13000	-	10.0
	d471-x01-y01	13000	-	0.73
	d472-x01-y01	13000	-	3.3
	d473-x01-y01	13000	-	1.8
	d478-x01-y01	13000	-	11
	d479-x01-y01	13000	-	3.9
	d480-x01-y01	13000	-	2.1
	d481-x01-y01	13000	-	1.5
Away Σ(pT) vs p_T^lead	CDF_2010_I849042	1960	-	7.3
Transverse Σ(pT) vs p_T^lead	CDF_2010_I849042	1960	-	14
sumpt-vs-pt-trnsDif	CDF_2010_I849042	1960	-	12
TransMAX Σ(pT) vs p_T^lead	CDF_2010_I849042	1960	-	13
TransMIN Σ(pT) vs p_T^lead	CDF_2010_I849042	1960	-	23
Toward Σ(pT) vs p_T^lead	CDF_2010_I849042	1960	-	19
z.m	PHENIX_2019_I1672015	200	-	n/a
pT Z	CDF_2000_I505738	1800	-	9.2
	CDF_2012_I1124333	1960	-	12
	CMS_2019_I1753680	13000	-	69
	d27-x01-y01	13000	-	82
	d27-x01-y02	13000	-	80
	d27-x01-y03	13000	-	98
	d29-x01-y01	13000	-	72
	d29-x01-y02	13000	-	72
	d29-x01-y03	13000	-	58
	d29-x01-y04	13000	-	53
	d29-x01-y05	13000	-	36
	CMS_2022_I2079374	13000	-	76
	d01-x01-y01	13000	-	210
	d03-x01-y01	13000	-	85
	d05-x01-y01	13000	-	65
	d07-x01-y01	13000	-	23
	d09-x01-y01	13000	-	6.8
	d11-x01-y01	13000	-	110
	d13-x01-y01	13000	-	84
	d15-x01-y01	13000	-	77
	d17-x01-y01	13000	-	29
	D0_2010_I856972	1960	-	4.5
	PHENIX_2019_I1672015	200	-	n/a
z.pt._z.pt	CMS_2022_I2079374	13000	-	11
	d29-x01-y01	13000	-	46
	d31-x01-y01	13000	-	0.99
	d33-x01-y01	13000	-	2.1
	d35-x01-y01	13000	-	1.7
	d37-x01-y01	13000	-	24
	d39-x01-y01	13000	-	0.76
	d41-x01-y01	13000	-	3.4
z.pt_norm	ATLAS_2011_I917931	7000	-	3.9
	d01-x01-y02	7000	-	3.2
	d01-x01-y03	7000	-	3.5
	d02-x01-y02	7000	-	4.5
	d02-x01-y03	7000	-	4.5
	ATLAS_2019_I1768911	13000	-	19
	CMS_2019_I1753680	13000	-	20
	d30-x01-y01	13000	-	30
	d33-x01-y01	13000	-	21
	d33-x01-y02	13000	-	22
	d33-x01-y03	13000	-	18
	d33-x01-y04	13000	-	17
	d33-x01-y05	13000	-	12
	D0_2010_I856972	1960	-	1.3
y Z	ATLAS_2016_I1467454	8000	-	16
	d19-x01-y01	8000	-	29
	d20-x01-y01	8000	-	25
	d21-x01-y01	8000	-	13
	d22-x01-y01	8000	-	5.2
	d23-x01-y01	8000	-	3.0
	d30-x01-y01	8000	-	29
	d31-x01-y01	8000	-	25
	d32-x01-y01	8000	-	16
	d33-x01-y01	8000	-	11
	d34-x01-y01	8000	-	4.7
	CMS_2019_I1753680	13000	-	47
	d26-x01-y01	13000	-	45
	d26-x01-y02	13000	-	48
	d26-x01-y03	13000	-	48
	LHCB_2012_I1208102	7000	-	8.5
z.y_norm	CMS_2019_I1753680	13000	-	0.55

* several "n/a" histograms were excluded from the calculation

n/a indicates that the χ² value is unavailable, typically due to mismatched binning between theoretical and MC histograms or other issues.

The page data is based on 473 histograms.

Generator / tune

Details for Pythia 8.313 dire-default vs. 8.315

pp/ppbar → Z (Drell-Yan)